WASTE WATER TREATMENT SELECTION GUIDE

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1 WASTE WATER TREATMENT SELECTION GUIDE Includes Bar Screen Specifications & Aerator Selection Guide (TRN technical manual) Jan 13

Tsurumi first started producing submersible pumps in 1953 and through an ongoing and

total manufacturing capability: 1,000,000 units per year.

Tsurumi produces more submersible pumps per year than any other submersible pump

Tsurumi offers over 10 different models of submersible pumps Types of submersible pumps

2 Who is Tsurumi? Established in 194, Tsurumi is one of the world s most experienced pump manufacturers Tsurumi first started producing submersible pumps in 1953 and through an ongoing and extensive research and development programme, has produced many innovations in submersible pump design. Tsurumi s Kyoto Plant is the world s most modern submersible pump manufacturing plant - total manufacturing capability: 1,000,000 units per year. Testing facilities with capability testing of large pumps up to mm bore. Tsurumi produces more submersible pumps per year than any other submersible pump manufacturer in the world (0,000 units per year). Tsurumi offers over 10 different models of submersible pumps Types of submersible pumps produced: Semi-Vortex, Vortex, Non Clog, Cutter, Mixed Flow, Axial Flow, Radial Flow, Contractor & Dewatering, Sewage & Wastewater, Aerators & Blowers, Decanting Units, Scum Skimmers. Established dealer network in Europe, North and South America, Asia, Australia and parts of Africa. At Tsurumi there is only one level of quality - the best Australian Pump Industries (0) 5

All liquid waste to be aerated must be screened first KE & KM Bar Screens Mechanically cleaned bar screens; designed for the small plant inflows to remove solids from the wastewater, eliminating

APPLICATION Primary treatment at a factory wastewater treatment plant Screening suspended solid from kitchen effluent at hotel, factory, hospital, etc.

The saw teeth on each rake travel between screen bars, which prevents foreign matters from lodging in the screen bars.

3 All liquid waste to be aerated must be screened first KE & KM Bar Screens Mechanically cleaned bar screens; designed for the small plant inflows to remove solids from the wastewater, eliminating solids from aeration & Clarification tanks. Screen capacity range to,7 lpm. Bar spacing range from 1mm to mm. Screen is fabricate in 4 stainless steel for corrosion resistance. APPLICATION Primary treatment at a factory wastewater treatment plant Screening suspended solid from kitchen effluent at hotel, factory, hospital, etc. Screening suspended solid from wastewater at small scale wastewater facility The KE/KS SERIES are front-type mechanical bar screens in which major parts are made of 4 stainless steel. The saw teeth on each rake travel between screen bars, which prevents foreign matters from lodging in the screen bars. The KS-series has an eccentric roller mechanism that pulls the rake out of the screen bars at the solids releasing point and eliminates the jamming of solids. The KM/KMA SERIES are rear-type mechanical bar screens in which major parts are made of 4 stainless steel. The chain and sprocket do not come in contact with the liquid that prevents sticking of solids to the rotating parts. Being a self-standing design, it can be directly installed to a U-shaped waterway.

4 CONTENTS 1. Introduction. Comparison of Aeration System/Equipment 3. Fluid to be Handled and Standard Specifications of TRN-series Aerators 3-1 Fluid to be Handled 3 3- Standard Specifications of TRN-series Aerators - Hz Standard Specifications of TRN-series Aerators - 0Hz 3 4. Shape and Dimension of Aeration Tank 4-1 Typical Convection Pattern 4 4- Shape of Aeration Tanks Recommended Tank Dimensions (Standard) Notes to the Case that Two or More Aerators are to be installed in a Tank 5 5. Aerator with Optional Stand or Draft Tube 5-1 Recommended Tank Dimensions (with Stand or Draft Tube). Oxygen Transfer Rate 7-1 Oxygen Transfer Rate Test Result 7 - Oxygen Transfer Rate vs. Water Curve - Hz -3 Oxygen Transfer Rate vs. Water Curve - 0Hz 9 7. Operation System 7-1 Reduced Speed Operation by Variable Frequency Drive (VFD) Comparisons in the Method of Adjustment 7-1- Comparisons in Adjustment Range (for reference only) Characteristics of Reduced Speed Operation by VFD (for reference only) 7- Operation in combination with Blower Comparison against Other Deep Aeration Methods (in case the tank depth is ) Equipment necessary for this Operation Operation Adjusting Procedure for Air Flow Rate (e.g. 0V, Hz) Selection Procedure (Example) Recommended Tank Dimensions (combination with blower) Initially Targeted Operating Point of Blower and 7--7 Operating Range of Aerator on Running Current (combination with blower - Hz) Initially Targeted Operating Point of Blower and 7--7 Operating Range of Aerator on Running Current (combination with blower - 0Hz) Oxygen Transfer Rate vs. Air Flow Rate Curve (combination with blower - Hz) Oxygen Transfer Rate vs. Air Flow Rate Curve (combination with blower - 0Hz) Discharge Pressure of Blower vs. Air Flow Rate Curve (combination with blower - Hz) Discharge Pressure of Blower vs. Air Flow Rate Curve (combination with blower - 0Hz) 19. About Noise -1 Measured Point and Condition - Measured Sound Pressure Level Data 1

1. Introduction The TRN aerator employs a special impeller that draws air by its self-aspiration force, and the air sucked down into the aerator is subjected to an air/water collision within the

This aerator is excellent in durability by its unique air seal system and has a superior maintainability in spite of its simple structure.

Rotary Blower, Method RSR) Plate Diffuser Tube Diffuser Plate Diffuser Air Holder Air Diffuse Air Air Air Air General Description Material (Diffuser Part) Oxygen Transfer Efficiency (Clean Water /

the water is subjected to an air/water collision within the Stainless Steel (Impeller) With the combination of a blower, high-efficient oxygen transferring and mixing is possible by the high

5 1. Introduction The TRN aerator employs a special impeller that draws air by its self-aspiration force, and the air sucked down into the aerator is subjected to an air/water collision within the guide vane, and then this mixed air-water current is forcibly discharged through the discharge outlets. This aerator is excellent in durability by its unique air seal system and has a superior maintainability in spite of its simple structure.. Comparison of Aeration System/Equipment Submersible Aerator (TRN-series) Air (Self-aspiration) aa Submersible Air Fine Bubble Aeration ( ) Mixer (TAR-series) Full Aeration Line Aeration Method (+ Rotary Blower, Method RSR) Plate Diffuser Tube Diffuser Plate Diffuser Air Holder Air Diffuse Air Air Air Air General Description Material (Diffuser Part) Oxygen Transfer Efficiency (Clean Water / Water : 5m) Intermittent Operation Need for a Blower or Air Piping Overhaul Controllability Other A special impeller for a self-aspiration force draws air without blower, and the air sucked down into the water is subjected to an air/water collision within the guide vane, and then this mixed air-water current is forcibly discharged through the discharge outlets. Stainless Steel (Impeller) With the combination of a blower, high-efficient oxygen transferring and mixing is possible by the high efficiency impeller and the four-direction discharge; This can be used for either anaerobic or aerobic treatment. Stainless Steel (Discharge Part of the Air-supply Pipe) It consists of plate-shape diffusers formed by uniformly sized ceramic particles or porous resin. Ceramic or Synthetic Resin It consists of cylindrical diffusers formed by uniformly sized ceramic particles or porous resin. It is formed by uniformly sized ceramic particles or by porous resin plates. It is smaller than the line aeration method diffusers, and the bubbles are finer than the plate diffuser or tube diffuser. 17 to 3% to % 14 to 1% to 3% Possible Unnecessary (Air-inlet Pipe and Silencer needed) Simple structure, same as the submersible pumps, makes it easy for maintenance. It is possible to be controlled by a VFD to some extent. (See p Reduced Speed Operation by VFD) Well-durability by the air seal Necessary When maintenance is required, it should be taken to the factory because of built-in reduction gears. Well-controllable no limit of air flow rate Highly efficient in oxygen transfer rate per unit of electric power. Can be used for anaerobic aeration. Impossible Necessary to drain sewage water from the tank Less Controllable Minimum air flow rate has been determined Aging increase in pressure loss Cited Reference: Guideline and Manual for Planning and Design in Sewerage Systems (01) issued by Japan Sewerage Works Association (Oxygen transfer efficiencies of the TRN-series are those calculated from the oxygen transfer rate at 5 meter s depth on the curves of -. and -3. Oxygen Transfer Rate vs. Water Curve on pages and 9 and the inhaled air flow rate, for the models that have the maximum water depth of meters.)

6 3. Fluid to be Handled and Standard Specifications of TRN-series Aerators 3-1. Fluid to be Handled Type of Liquid Temperature [ o C] Liquid to be Handled Chlorine Ion ph Concentration [mg/l] Electrical Conductivity [μs/cm] Wastewater & sewage 0 to 40 5 to 9 Below 00 Below 00 Caution 3-. Standard Specifications of TRN-series Aerators - Hz Airinlet Bore [mm] 3 Model Motor Output [kw] Starting Method Max Water (MWD) Air Flow Rate - MWD [m 3 /h]- No. of Outlets Impeller Passage [mm] Mass (Weight) [kg] Material Gas to be Handled (Suction through the air-inlet pipe) Should not be inflammable, corrosive, or toxic Cabtyre Cable Cores x mm 3TRN D.O.L PVC 4x TRN D.O.L PVC 4x TRN4.-5. D.O.L PVC 4 x 11. TRN D.O.L PVC 4 x 11. TRN D.O.L CR 4 x TRN D.O.L CR 4 x x TRN Star-Delta CR 3 x x TRN Star-Delta - 15 CR 0 0TRN Star-Delta 3-40 CR 1 1TRN Star-Delta CR 3-3. Standard Specifications of TRN-series Aerators - 0Hz Airinlet Bore [mm] 3 We assume no responsibility for any damages resulting from solids that enter even through the air-inlet pipe. We do not indemnify for any secondary, consequential or incidental damages caused by a fault of the TRN aerator. Model Motor Output [kw] Starting Method Max Water (MWD) Air Flow Rate - MWD [m 3 /h]- No. of Outlets Impeller Passage [mm] Mass (Weight) [kg] Material 4 x x 5.5 x x 14 3 x 14 x x 14 3 x 14 x 1.5 Outer Dia. [mm] Cabtyre Cable Cores x mm 3TRN D.O.L PVC 4x TRN D.O.L PVC 4x TRN4.-. D.O.L PVC 4 x 11. TRN D.O.L PVC 4 x TRN D.O.L CR 4 x TRN D.O.L CR 4 x x TRN41-1 Star-Delta CR 3 x x TRN Star-Delta - 15 CR 0 0TRN44-4 Star-Delta CR 1 1TRN Star-Delta CR 4 x x 5.5 x x 14 3 x 14 x x 14 3 x 14 x 1.5 Note:) Following notes are applicable to the above two tables. The air flow rates are expressed at the standard conditions.: Temperature o C, 1atm The air flow rates may vary by up to approximately 5%. The Maximum Water (MWD) is the limit of installation depth that the aerator can run without overload. The motor load increases as the installation depth becomes deeper, therefore, if the aerator is operated at a deeper position than this limit, the motor will be overload, and then the motor protection device will operate, which makes it impossible to run continuously. Mass (Weights) excluding cable. PVC = PVC sheathed cable CR = Chloroprene rubber sheathed cable Outer Dia. [mm] Length Length 3

7 4. Shape and Dimension of Aeration Tank 4-1. Typical Convection Pattern Sub convection Main Convection Main Convection: Convection made by rising bubbles. (The minimum distance that must be provided between each aerator) Sub-convection: The maximum convection that can keep solids suspended to prevent sedimentation of solids. W.L Diffused convection flow generated by the rising of bubbles 4-. Shape of Aeration Tanks Circular Tank Square Tank Rectangular Tank a b φa a a W.L W.L W.L W.L W.L W.L h h h 4-3. Recommended Tank Dimensions (Standard) Airinlet Bore [mm] 3 Model Motor Output [kw] Max. Water Main Convection Dia. Circular Tank φa Square Tank a Dimension of Sub-convection Rectangular Tank (below 1 : 1.5) a b Rectangular Tank (below 1 : ) 3TRN.75-5/ TRN1.5-5/ TRN4.-5/ a b TRN43.7-5/ TRN45.5-5/ TRN47.5-5/ TRN41-5/ TRN417-5/ TRN44-5/ TRN440-5/ Dimension of each tank has been determined at the maximum water depth. It shall be altered if the aerator is to be installed at a different depth. It is recommended to provide a haunch between the bottom of the tank and every side wall in order to maintain the mixing efficiency. The maximum water depth (MWD) is the limit of installation depth that the aerator can run without overload. The motor load increases as the installation depth becomes deeper, therefore, if the aerator is operated at a deeper position than this limit, the motor will be overload, and then the motor protection device will operate, which makes it impossible to run continuously. 4

8 4-4. Notes to the Case that Two or More Aerators are to be installed in a Tank. If there is a need to install two or more aerators having the same output in a tank, decide the place of installation paying attention to the distance between or among the aerators and the distance between the aerator and the tank s sidewall. The distance between or among the aerators should be more than the Main Convection Diameter in the table of 4-3. Recommended Tank Dimensions (Standard) on page 4. The distance between the aerator and the sidewall should be so decided that the main convection might not hit directly on the sidewall. In addition, it shall be taken into account that the area to be convected by one aerator must be small than Dimension of Sub-convection in the same table. If above-mentioned distances are smaller than the main convection, the aerator will suck the mixed air-water current, and as a result it may lead to an unsteady operation of the aerator. If the area convected by one aerator is bigger than the sub-convection of each aerator, the sufficiency mixing force does not spread throughout the tank, and as a result it may allow the sludge to settle at the tank bottom. Main Convection Main Convection W.L Distance between the installed aerators should be greater than the main convection diameter. Main Convection CIRCULAR TANK Main Convection SQUARE TANK RECTANGULAR TANK Main Convection 5

9 5. Aerator with Optional Stand or Draft Tube There may be a need to install the aerator at a deeper position than its MWD, for example; An aerator is going to be installed in an existing tank, and it is not possible to alter the depth of the tank, and Because of the limited surface area, the tank must be designed to have a greater depth, etc. Adoption of a Tsurumi aerator with optional stand or draft tube (DT) will be one of the solutions for these cases. In case of using a stand, the mixing force at the bottom will be weakened as the inlet port of the aerator moves away from the bottom. Therefore, we have set the height limit on the stand of 0.5 meters, and for the cases of more than 0.5meters are required, we recommend an aerator with a DT. Note that the oxygen transfer rate and the air flow rate of the aerator shall be those that are obtainable at its self-aspiration water depth d [installation water depth h (minus) height of stand or DT]. In addition, it shall be noted that the performance of the aerator with DT can be slightly lower than that of the standard. When there is a fear of overload occurring to the motor by due to a reason that it is going to operate in a viscous liquid, etc., it will be possible to prevent the overload by reducing the self-aspiration water depth d with this method. The aerator may move or fall during operation by a reason that it is sitting on an irregular floor like slanted, bumpy, or slippery floor, or by a reason that it is installed in such that the weight of air-inlet piping acts on the aerator. Take an appropriate preventive measure in accordance with the conditions. In case that there is any flow generating equipment in the tank, the same measure must be required. Water h Discharge Current Self-aspiration Water d (Within MWD) Discharge Current Discharge Current Suction Current With Optional Stand / DT Suction Current Suction Current With a stand of 0.5m Image of 0.75kW (Available 0.75kW to 40kW) With a DT of 1.0m Image of 5.5kW (Available kw to 40kW) With a DT of 1.5m Image of 40kW (Available 4kW to 40kW) 5-1. Recommended Tank Dimensions (with Stand or Draft Tube) Airinlet Bore [mm] 3 with Stand (0.5m) Draft Tube (1.0m) Draft Tube (1.5m) Dimension of Sub-convection Dimension of Sub-convection Dimension of Sub-convection Model Max Circular Square Circular Square Circular Square Motor Water Water Tank Tank Water Tank Tank Water Tank Tank Output h φa a h φa a h φa a [kw] 3TRN.75-5/ TRN1.5-5/ TRN4.-5/ TRN43.7-5/ TRN45.5-5/ TRN47.5-5/ TRN41-5/ TRN417-5/ TRN44-5/ TRN440-5/ Dimensions of each tank are those that have been determined under the condition that the self-aspiration water depth d equals to the maximum water depth. These dimensions will vary depending on the installation water depth h. It is recommended to provide a haunch between the bottom of the tank and every sidewall in order to maintain the mixing efficiency. The aerator with a draft tube is not available in the shaded area. The maximum water depth is the limit of installation depth that the aerator can run without overload. The motor load increases as the installation depth becomes deeper, therefore, if the aerator is operated at a deeper position than this limit, the motor will be overloaded, and then the motor protection device will operate, which makes it impossible to run continuously. Refer to 4-1. Typical Convection Pattern and 4-. Shape of Aeration Tanks on page 4 for the explanations on the tank shape and the dimension.

10 . Oxygen Transfer Rate The oxygen transfer rate is the speed that the oxygen in the air dissolves into a liquid. It can be a guide when a biological treatment is going to be designed. The oxygen transfer rate is not the one that is directly measured. It is given from the calculations taking various factors such as DO concentration, ambient temperature, and water temperature, etc. The oxygen transfer rate may vary by up to approximately %. The tables -1. below show the results of the tests that have been carried out on the TRN aerators in our test tank. It is suggested that these figures be used taking the above conditions into full consideration when selecting the aerators. The measurement of DO has been made by a Non-steady State method at the condition of fresh water, o C, 1atm, with the dissolved oxygen of 0mg/l. The air flow rates are those of standard condition, o C, 1atm. The aerator was tested under its standard installation; placed at the center of the tank and at the standard installation depth. 1. Oxygen Transfer Rate Test Result Hz Air-inlet Bore [mm] Model Motor Output [kw] Water h (Standard) Air Flow Rate [m 3 /h] Oxygen Transfer Rate [kgo /h] 3 3TRN TRN TRN TRN TRN TRN TRN TRN TRN TRN Test Tank Plane Dimension x Tank A ( 5 x 5 ) Tank B ( x ) 0Hz Air-inlet Bore [mm] Model Motor Output [kw] Water h (Standard) Air Flow Rate [m 3 /h] Oxygen Transfer Rate [kgo /h] 3 3TRN TRN TRN TRN TRN TRN TRN TRN TRN TRN Test Tank Plane Dimension x Tank A ( 5 x 5 ) Tank B ( x ) 7

11 -. Oxygen Transfer Rate vs. Water Curve - Hz * Calculated from the test result of Table -1. The oxygen transfer rate may vary by up to approximately %. For the actual use, it may further vary depending on the type of liquid and the shape of tank, so that select a suitable aerator having a certain margin. 0.75kW and 1.5kW 7.5kW to 17kW TRN TRN417-5 Oxygen Transfer Rate [kgo /h] TRN Water Oxygen Transfer Rate [kgo /h] 1 4 TRN41-5 TRN Water.kW to 5.5kW 4kW and 40kW 35 TRN TRN440-5 Oxygen Transfer Rate [kgo /h] 4 3 TRN TRN4.-5 Oxygen Transfer Rate [kgo /h] TRN Water Water

12 -3. Oxygen Transfer Rate vs. Water Curve - 0Hz * Calculated from the test result of Table -1. The oxygen transfer rate may vary by up to approximately %. For the actual use, it may further vary depending on the type of liquid and the shape of tank, so that select a suitable aerator having a certain margin. 0.75kW and 1.5kW 7.5kW to 17kW TRN1.5-3TRN Water Oxygen Transfer Rate [kgo /h] 1 4 TRN417- TRN41- TRN Water.kW to 5.5kW 4kW and 40kW 35 5 TRN45.5-1TRN TRN TRN44-1 TRN Water Water 9

13 7. Operation System 7-1. Reduced Speed Operation by Variable Frequency Drive (VFD) There are two methods in the adjustment of air flow rate and the oxygen transfer rate of the result. One is to squeeze the valve that is installed in the air-inlet piping, and the other is to reduce the speed of aerator by VFD. However, the aerator has the characteristics described below, and different effects are expected. The motor load increases as the installation depth becomes deeper. The motor load increases as we reduce the air flow rate squeezing the valve that is installed in the air-inlet piping. In most cases, the adoption of reduced speed operation by VFD will enable us to regulate the air flow rate in a more extensive range than operating the valve, without sacrificing the efficiency. A comparison in the methods of adjustment is made in the following table. Refer to this table in your planning. The graph of shows comparisons in adjustment range between the two methods and shows characteristics of reduced speed operation by VFD for an aerator (Model TRN43.7-) at meters depth which has the widest possible range in the adjustment of air flow rate Comparisons in the Method of Adjustment Methods for Features Adjustment ( : shows the merit, : shows the demerit) will be completed by simply connection the valve at the inlet port of the air-inlet pipe. Adjustment Low power efficiency (kgo / kwh) Disadvantage in the energy saving by squeezing It is difficult to make an accurate control as the air flow rate and the operating current cannot be stabilized. the valve Louder beat Narrow adjustment range at a deeper installation Adjustment by reducing the speed with a VFD It is necessary to install a VFD (extra initial cost is necessary). The power efficiency (kgo / kwh) shall be maintained virtually constant. Energy saving operation with reduced power consumption is possible. The air flow rate and the running current can be maintained constant. Possible to control the air flow rate and the oxygen transfer rate accurately. Reduction of the operating frequency (reduction in air flow rate) will decrease the sound level Comparisons in Adjustment Range (for reference only) 1 shows the adjustment range served by a VFD, and shows it served by a valve. Estimated Air Flow Rate at the Standard Condition ( o C, 1atm) Test Result at Our Test Tank (5m x 5m) with Clean Water, Converted to o C Characteristics of Reduced Speed Operation by VFD (for reference only) Estimated Air Flow Rate at the Standard Condition ( o C, 1atm) Water m Decrease in Load Water m Increase in Load Operation Frequency [Hz] Water 4 m Water 3 m The motor will be overloaded if the valve is squeezed more than this point. Test Result at Our Test Tank (5m x 5m) with Clean Water, Converted to o C Oxyge Transfer Rate [kgo/h] Water m The changing trend of the motor load is the same モータ負荷の変化傾向は左図と同じ as left graph. Operation Frequency [Hz] Water 4 m Water m The motor will be overloaded if the valve is squeezed more than this point. Water 3 m Operation Frequency [Hz] Operation Frequency [Hz]

14 7-. Operation in combination with Blower This is an operation system that an aerator and a general purpose blower are operated in conjunction. The blower is installed at the end of air-inlet line of an aerator and gives pressure to the air. This enables us to install the aerator at a deeper position than the designed standard. For example, the aerator can be operated at the depth of meters by means of the principle that the general purpose blower gives pressure to the air for 5 meters depth and the aerator sucks air for the 5 meters depth Comparison against Other Deep Aeration Methods (in case the tank depth is ) Aeration Equipment Submersible Aerator (Tsurumi TRN series, self-aspiration type) Submersible Aerator (Draft Tube type axial-flow mixer) Water h Oxygen Transfer Efficiency (Clean Water) [%] to 53 (Estimated value) Pressure Loss by Equipment [kpa] 0 (because of the self-aspiration system) 5 to. to 4.5 Remarks ( : Merit, : Demerit) High in the oxygen transfer efficiency as the aerator can be installed at the bottom. Possible to operate with smaller powers (See p ). or maintenance work can be performed without draining the tank High-durability due to the original air-seal structure and the OIL LIFTER. One (1) blower must be engaged to one (1) aerator only. Possible to reduce the equipment quantity as high in oxygen transfer rate. Anaerobic treatment is possible. Requiring the draft tube. Expensive in piping equipment. Necessary to drain the tank in its first installation. Airsupply Pipe Components Used (Summary) See p Equipment necessary for this Operation Draft Tube Submersible Aerator (Draft Tube type axial-flow mixer) Water h Requiring the guide plate. Air-supply Pipe Expensive in Plate Diffuser (Convection by line aeration method) 5 15 to to 0.7 (aging increase in pressure loss) piping equipment. Necessary to drain the tank in its first installation and Water h Plate Diffuser Guide Plate maintenance. A general purpose blower is supposed to be applicable to use up to 0 kpa. The oxygen transfer efficiencies and the figure are quoted from Guideline and Manual for Planning and Design in Sewerage Systems (01). When selecting a blower, calculate the required pressure including the loss of pressure which is generated in the piping system. 11

15 7 -. Equipment necessary for this Operation The blower must be operated with a VFD (Never use direct-on-line starting to start the blower.). Operation with a VFD will be effective in energy saving. One (1) blower must be engaged to one (1) aerator only. This is because, the air is transferred to the deeper area of the tank by utilizing both the outlet pressure of the blower and the suction force of the aerator, and it is required to keep the balance between the two equipments. If the balance is disrupted, the aerator may idle (impeller runs in air) or may stop its operation by due to tripping of the motor protection device caused by an overloading reason. As a result of these conditions, the blower gets into the closed-valve operation, which can cause the danger of a breakdown of the blower by the reason of overload or abnormal pressure. Be sure to provide a non-return valve in the blower outlet piping. This is to prevent the treating liquid from flowing back to the blower when the blower stops. Back-flow of the treating liquid pressurizes the air in the piping, and this may cause the danger of a breakdown of the blower. Provide a pressure gauge, which indicates the outlet pressure of the blower. This is required for operation adjustments. When there is a need for the correct adjustment of air flow rate, provide a flow meter. For other precautions, follow the instructions specified in each design manual. Blower House Blower (with VFD) Pressure Gauge Non-return Valve Air-inlet Pipe W.L Pressure depth covered by the blower Water h Self-aspiration water depth d by the submersible aerator (within the maximum installation water depth of each aerator) Submersible Aerator 1

16 7--3. Operation Operation of the submersible aerator and the blower shall be controlled in such a manner that both equipment be started or stopped simultaneously. Regulate the acceleration time (VFD) to approximately seconds, and secure the stable starts of these equipments. In case that the acceleration time is longer than this, the motor protection device of the aerator may trip to stall the aerator by due to overload, and as a result the blower may have the danger of breakdown due to overload or an abnormal pressure. In addition, the deceleration time (VFD) shall be regulated to the region between 15 to seconds so that the non-return valve may not suffer an impact Adjusting Procedure for Air Flow Rate (e.g. 0V, Hz) Step 1. Prepare a clamp meter to measure the running current of the submersible aerator. Step. Regulate the rotating speed of the blower with VFD, according to the Initially Targeted Operating Point of Blower in the table of p Do not carry out this adjusting work by solely operating the blower. In case that the aerator is not operating together, there may be the danger of breakdown of the blower by due to overload or abnormal pressure as the blower gets into the closed-valve condition. Step 3. Start the submersible aerator and the blower simultaneously. Step 4. Confirm that the running current of the submersible aerator is within the limit of Operating Range of Aerator on Running Current described in the table of p If not, rotating speed of the blower so that the running current of the submersible aerator may fall within the operating range. Method to decrease the running current of submersible aerator; Increase the rotating speed of the blower. By this, the self-aspiration water depth d of the submersible aerator becomes shallower and the running current will be decreased. Method to increase the running current of submersible aerator; Decrease the rotating speed of the blower. By this, the self-aspiration water depth d of the submersible aerator becomes deeper and the running current will be increased. If the running current of the aerator plunges much lower than the Operating Range of Aerator on Running Current, it shows a symptom that the balance between the outlet pressure of the blower and the suction force of the aerator is disrupted, and that the aerator is not generating any suction force because it is idling. In this case, stop both of the blower and aerator immediately. If this condition continues, there will be the danger of breakdown of the blower by due to overload or an abnormal pressure as the blower gets into the closed-valve operation. Step 5. Adjust the rotating speed of the blower with VFD in such a manner that the blower may discharge the targeted air flow rate at its required pressure in a graph of Discharge Pressure of Blower vs. Air Flow Rate Curve (combination with blower Hz) on page 1. Note that, depending on the operating condition, the blower could discharge the targeted air flow rate at a pressure point lower than indicated in a graph of p In this case, adjust the rotating speed of the blower assuming that it discharges maximum air flow rate on its graph at the point of minimum (running) current in the Operating Range of Aerator on Running Current in the table of p and that it discharges minimum air flow rate on its graph at the point of maximum (running) current in the range. 13

17 7--5. Selection Procedure (Example) Condition - Water of, Required Oxygen Transfer Rate of 1.5kgO /h (clean water), 0V, Hz In case of Submersible Aerator + General purpose Blower Providing a safety factor of % for the required oxygen transfer rate, the required oxygen transfer rate shall be 1.kgO /h. Refer to p Oxygen Transfer Rate vs. Air Flow Rate Curve (combination with blower - Hz), and Model TRN (7.5kW) can be selected. The required air flow rate shall be 1m 3 /h. Refer to p Discharge Pressure of Blower vs. Air Flow Rate Curve (combination with blower - Hz, estimate). When the air flow rate required is 1m 3 /h (3.00m 3 /min), the required discharge pressure shall be 0.053MPa (53kPa). In case that a margin of 5kPa is added to the discharge pressure of the blower (considering the pressure loss in the pipe and a margin), the blower should have a duty of = 5 kpa. Required air flow rate shall be 3.15m 3 /min. including 5% allowance. Model RSR- (1370min 1, 3.m 3 /min, at 5.kPa, 5.01kW) can be selected, The total required power is = 1.51kW 7--. Recommended Tank Dimensions (combination with blower) Blower Dimension of Sub-convection Air-inlet Bore [mm] Model Motor Output [kw] TRN4.-5/. TRN43.7-5/ 3.7 TRN45.5-5/ 5.5 TRN47.5-5/ 7.5 TRN41 5/ 1 TRN417-5/ TRN44 5/ 4 1 1TRN440 5/ 40 Water h Discharge Pressure [kpa] Circular Tank φa Square Tank a The above table shows the estimated values under the condition that the self-aspiration water depth d (installation depth h Pressure depth covered by the blower) be 4 meters. The aerating depth of.kw model is 3. meters. For other operating conditions, refer to p Discharge pressure of Blower vs. Air Flow Rate Curve (combination with blower - Hz), or p Discharge pressure of Blower vs. Air Flow Rate Curve (combination with blower - 0Hz). Discharge pressures in above do not include the pressure loss in the piping. It is required to calculate and add it to the above value when selecting the blower. It is recommended that a haunch be provided between each sidewall and the bottom of the tank so as to maintain the mixing efficiency. Only the above models are applicable to the combined use of an aerator and a blower. Refer to 4-1. Typical Convection Pattern and 4-. Shape of Aeration Tanks on page 4 for explanations on the tank shape and the dimension. 14

18 7--7. Initially Targeted Operating Point of Blower and Operating Range of Aerator on Running Current (combination with blower - Hz) Hz Model Motor Output [kw] TRN4.-5. TRN TRN TRN TRN TRN TRN TRN Water h Initially Targeted Operating Point of Blower Discharge Pressure of Blower [kpa] 15 Inlet Air Flow Rate of Blower [m 3 /min] Operating Range of Aerator on Running Current (0V) [A] (400V) [A] 9.0 to to to to..0 to to to to to to to to to 9 39 to to 15 7 to Initially Targeted Operating Point of Blower and Operating Range of Aerator on Running Current (combination with blower 0Hz) 0Hz Model Motor Output [kw] Water h Initially Targeted Operating Point of Blower Discharge Pressure of Blower [kpa] Inlet Air Flow Rate of Blower [m 3 /min] Operating Range of Aerator on Running Current TRN to to TRN to to TRN to. 9.0 to TRN to to TRN to to TRN to.3.0 to TRN to 9 40 to TRN to to The above tables are those that are to be utilized in p Adjusting Procedure for Air Flow Rate (e.g. 0V, Hz). To adjust the air flow rate of the blower initially, set the VFD to regulate the blower speed to perform Initially Targeted Operating Point of Blower. For the operation in combination with a blower, adjust the rotating speed of the blower so that the running current of the submersible aerator may fall within the Operating Range of Aerator stated above. If the running current of the aerator goes beyond its range, the balance between the outlet pressure of the blower and the suction force of the aerator will be disrupted, and the aerator will idle (impeller runs in air) or will stop its operation by due to tripping of the motor protection device caused by an overloading reason. As a result of these conditions, the blower gets into the closed-valve operation, which can cause the danger of breakdown of the blower by the reason of overload or abnormal pressure. (0V) [A] (400V) [A]

19 7--9. Oxygen Transfer Rate vs. Air Flow Rate Curve (combination with blower - Hz) * Calculated from -1 and Data on this page are for reference only. It is suggested that a certain safety margin be added in your selection. 9 TRN TRN TRN TRN TRN TRN TRN TRN Air Flow Rate[m 3 /h] 1

20 7--. Oxygen Transfer Rate vs. Air Flow Rate Curve (combination with blower - 0Hz) * Calculated from -1 and Data on this page are for reference only. It is suggested that a certain safety margin be added in your selection. 9 TRN TRN TRN TRN TRN TRN TRN TRN

21 Discharge Pressure of Blower vs. Air Flow Rate Curve (combination with blower - Hz) Estimated Air Flow Rate at the Standard Condition ( o C, 1atm) TRN4.-5 and TRN TRN41-5 and TRN TRN TRN TRN417-5 TRN Discharge Pressure of Blower [MPa] Discharge Pressure of Blower [MPa] TRN and TRN TRN44-5 and 1TRN TRN TRN TRN TRN Discharge Pressure of Blower [MPa] Discharge Pressure of Blower [MPa] 1

22 7--1. Discharge Pressure of Blower vs. Air Flow Rate Curve (combination with blower - 0Hz) Estimated Air Flow Rate at the Standard Condition ( o C, 1atm) TRN4.- and TRN43.7- TRN41- and TRN TRN TRN TRN417- TRN Discharge Pressure of Blower [MPa] Dicharge Pressure of Blower [MPa] TRN45.5- and TRN47.5-0TRN44- and 1TRN TRN TRN TRN TRN Discharge Pressure of Blower [MPa] Discarge Pressure of Blower [MPa] 19

23 . About Noise Suction noise will be generated at the suction silencer while the gas to be handled is being sucked by the submersible aerator. -. Measured Sound Pressure Level Data shows the sound pressure level of each aerator. Note that these sound pressure level data are those measured at an indoor test facility in our factory and are not the guaranteed figures that are expected at your site. Also note that the sound pressure level may vary depending on various factors like piping condition. -1. Measured Point and Condition Factory Structure Silencer 1m Sound Level Meter 1. Air-inlet Piping (PVC Flexible Hose, ) W.L Submersible Aerator -. Measured Sound Pressure Level Data Air-inlet Bore [mm] 3 Model Motor Output [kw] 3TRN TRN TRN4.. TRN TRN TRN TRN41 1 TRN TRN TRN m from the Silencer A-weighted Sound Pressure Water h Level [db(a)] The Inside of the Factory Structure Back Ground Noise Level [db(a)] Measurements of the sound pressure level have been carried out in accordance with JIS B , Fans, Blowers and Compressors - Determination of A-weighted Sound Pressure Level. The equipment used for the measurement was a standard sound level meter that complies with JIS C 1. Frequency correction A and SLOW time weighting were used for the sound level meter. The sound pressure level data are those that have been calculated from the average sound pressure levels measured at four (4) points, all of which are located at the same height of 1. from the floor but are equally distributed to four-way to the distance of 1m away from the silencer.

Equipment Selection Guide Sewage/waste water pumps Effluent Pumps Water Treatment Equipment Type Model Bore mm Motor Output kw Feature Corrosion resistant Explosion proof Corrosion resistant B -0 0.

5-11 Vortex sewage pump with large solid passage UT 0.4 Vortex sewage pump with single phase motor PU 40-0.15-1.5 Vortex sewage pump - resin PN 40-0.5-1.5 Semi-vortex wastewater pump - resin MG 3-1-3.

24 Equipment Selection Guide Sewage/waste water pumps Effluent Pumps Water Treatment Equipment Type Model Bore mm Motor Output kw Feature Corrosion resistant Explosion proof Corrosion resistant B Basic sewage pump BZ Basic sewage pump with large solid passage C Basic sewage pump with cutter mechanism U Vortex sewage pump with pole motor UZ Vortex sewage pump with large solid passage UT 0.4 Vortex sewage pump with single phase motor PU Vortex sewage pump - resin PN Semi-vortex wastewater pump - resin MG High head grinder pump BQ Cast ss version of B series CQ Cast ss version of C series BX Explosion proof version of B series CX Explosion proof version of C series UX Explosion proof version of U series PSF High head effluent pump - resin SF Semi-open impeller, for high head pumping OM Semi-vortex effluent pump - resin SQ Lightweight ss effluent pump SFQ Chemical effluent pump - cast ss TM Seawater pump - titanium & resin Blower RS Rotary air blower Aerator TRN Submersible self aspirating aerator BER Submersible axial-flow type aerator Skimmer FSP Floating scum skimmer Decanting pump FHP Float type decanting pump Bar Screen KE/KS - - Automatic mechanical bar screen (front) KM/KMA - - Automatic mechanical bar screen (rear) Dewatering pump range also available contact Pump Solutions Australasia for more details

400V 50Hz. Tsurumi TRN. Submersible aerator. Auto-suction submersible aerator for communal and industrial waste water clearance and treatment.

400V 50Hz. Tsurumi TRN. Submersible aerator. Auto-suction submersible aerator for communal and industrial waste water clearance and treatment. Tsurumi TRN 400V Hz Submersible aerator Auto-suction submersible aerator for communal and industrial waste water clearance and treatment. TRN-submersible aerator The Tsurumi TRN-submersible aerator is