FLOW SHEET OF SEWAGE TREATMENT PLANT MBR Inflow pre Collection tankSludge digester Bar Screen Equalization Recycle Filter Press Final water tank Chlorination Dual Media Filter (PSF & ACF) Pressure sand filter 11.000 Litres/day capacity sewage. Filter feed pump 10.SPECIFICATION FOR 50 KLD STP (Membrane Bio Reactor System) Details of STP units It is proposed to install STP of capacity 50. Bar Screen 2. Sludge Recycling Pump 6. Collection Sump cum Equalization unit 3. Activated carbon filter 2 . Membrane Bio Reactor system 5. Sludge collection tank 7. No. Following is the scheme for treating 50. Raw Sewage Pump 4. Characteristics considered: Flow PH TSS BOD COD Oil & Grease : 50KL/day :6-8 : 600 mg/l : 350 mg/l : 600 mg/l : 50 to 75 mg / Ltr.000 litres/day. of Hrs. operation: 24 1. etc. Sludge Dewatering 8. Various treatment units which have been envisaged in this sewage treatment plant are explained below. The treated water can be utilized for gardening. Pre collection tank 9. 4m x 3. 2. Equalization tank * Size of the unit * Volume of the Tank * Detention time available * Function : : : : 2. *Quantity *Duty *Type : : : 2 no. Chlorine Doser 13.m / Hr. Treated water transfer pump 15. 3 .5m x 2. Final Collection Tank 14. into the Membrane bio-reactor tank. Blower Capacity 16.5m SWD 25 m3 12 Hr. 3. (1w + 1s) To transfer Raw effluent from Equalisation tank to Membrane Bio Reactor Tank Vertical submersible pump. RAW SEWAGE PUMP The equalised and neutralised waste together with return sludge shall be pumped at a uniform rate of 5. Inter Plant Piping 17. Electrical 1.0 Cu.s during Average flow Equalizing the flow dampen the possible variation in the characteristics of the sewage and also to reduce initial organic load.12.5m x 0.4m long To separate coarse matter from the raw sewage. Bar Screen * Size of the Unit * Function : : 0.5m x 3. *Motor *Material : : TEFC Motor with IP-55 protection and suitable for 400 / 440 V. 5.387m x 2.000 mg/ Litre RCC .08 x 13. Base frame.0 Cu. CI Body and impeller in Bronze.7m2 2.0 m = 5. foundation bolts etc.66 m2 say 5.83m3 say 17m3 0.0833 m3/Hr 0.000 mg/l 350 x 50 * Therefore Volume of the Tank required: -----------------=16. Membrane Bio Reactor tank * Flow * F/M * MLSS * MOC (i) Calculation of volume of the tank: BOD X Flow rate Volume = -------------------------------F/M X MLSS Assume F/M = 0.m / hr 15 mtr 35 mm maximum Ambient *Accessories : *Flow rate *Head *Solids : : : *Temperature: 4. 50 HZ A/c supply of Kirloskar. Air cock with priming funnel.08 & MLSS = 13.08 13.0m SWD 4 * Size of Aeration Tank required = : : : : 50 m3 / day or 2. Flexible Coupling with guard.000 Assume SWD to be 3.0m Therefore plan area required = 17/3.387 m x 3. : 315mg/lit.23x0.579 m3/hr (iv) Calculation of diffuser required: Consideration 10 m3/hour diffusion of air through the diffuser 1 /m length.0579 or Say 9 diffusers.(ii) Calculation of total organic load : * Average BOD of sewage at the inlet of Aeration tank neglecting BOD Reduction with pre-aeration: 350 mg/lit * Total organic load with 10% BOD reduction considered.0 SWD depth = 0. : 2 X 15. 315 x Flow rate Organic load : ---------------------1000 * Total organic load in the system : 315 X 50/1000 = 15.6x0.6 & β =0.7 Consider oxygen transfer at 3.15x20 Assuming duration of air supply as 20 hours per day Air required = 90.2 Kg/m3 Percentage of Oxygen in Atmospheric air 23 31.5 ∴ Actual Air required for pre aeration : -----------------------------------1.7x0.75 = 31.5 Kg/day 5 .15% Density of Air: 1. Number of diffusers required = 90.579 /10 = 9.2x0.75 Kgs/day. * Total oxygen required assuming that 2 Kgs of O2 /Kg of BOD Removed (iii) Calculation of diffuser required: Assume alpha = 0. 08m Gap between each will provide an approximately 3000 m2 X 3 of membrane area.0m SWD 2. The equivalent hollow-fibre module filled with fibres of 100-mm diameter X 5 No.387m x 2.387m x 2.5 m3/Day 2 m3/Hr @ 8-10m head (25 mm pipe dia) 6 . Hollow-fibre units are almost always run with the feed stream on the outside of the fibre. 5.83 m) feet long. with 0. SLUDGE RECYCLE PUMP * Volume of Sludge * Discharge rate : : 17.s during Average flow to aerate and filter the sewage through the membrane hollow fibre modules and hold the contents of the MBR tank and to sustain the biological activity so as to reduce the organic load.387 m x 3.s in each set (total 3 sets). = to aerate the contents of the MBR tank and to sustain the biological activity so as to reduce the organic load. A number of hollow-fibres are collected together and "potted" in an epoxy resin at both ends and installed into an outer shell. Water passes through the membrane into the inside or "lumen" of the fibre.5m (Actual Size) * Volume of the Tank * Detention time available * Function : : : 19.* Type of aeration * Function = Membrane fine pore diffused aeration system.387 m x 3.94 m3 9. Hollow-fibre modules used are characteristically 4 inch (10cm) in diameter and 6 (1. * Size of the unit : 2.57 Hr. 000 7 : : : 0. SLUDGE HOLDING TANK Flow x BOD Bio-sludge produced /day : -----------------------------Sludge concentration 50 x 350 = -----------------------------10. SLUDGE DEWATERING Flow x BOD Bio-sludge produced /day : -----------------------------Sludge concentration 50 x 350 = -----------------------------10.0% concentration 20% of the sludge to be wasted Excess sludge to be wasted Volume of sludge holding tank Size of the tank 7. The pressure sand filter and activated carbon filter are used to remove the solids and colour.35 m3/day @ 1% 2 m3 0.000 = 1. colour.5 m SWD .* Function : To re-circulate the return Sludge to MBR tank to maintain the required MLSS & transfer excess sludge to filter press.9 m x 0.9 m x 2. 6. The wastewater after biological treatment still contains some solids. The disinfection process is used to remove the micro-organisms and odour. odour and harmful micro-organisms.75 cum/day @ 1. Cms (KSC) 8. 50 HZ A/c supply of Kirloskar make.35 m3/day @ 1% 350 Lts/day @ 1% Filter press of size 14” x 14” x 8 chambers provided. 9.0% concentration 20% of the sludge to be wasted Excess sludge to be wasted Total sludge to be dewatered : : 0. Filter press feed pump provided = 2 m3/hr @ 6.0 Kilogram/Sq.0m x 3. with IP-55 protection and suitable for 400 / 440 V. (1W + 1 SB) * Pumping Rate * Pumping Head * Function : : : 6 m3/hr 23-25m To pump the output water of MBR tank through Pressure sand & carbon filters. FILTER FEED PUMP – 2 Nos. Beacon make.75 cum/day @ 1. * Material : CI Body and impeller in Bronze 8 . * Motor : TEFC Motor. open impeller pumps of Kirloskar.= 1.0m SWD 27 m3 13 hours To collect & store the settled supernatant / treated sewage from the tank. * Type : Horizontal centrifugal non-clog Self priming.0m x 3. TREATED SEWAGE COLLECTION / PREFILTRATION TANK * Size of the unit * Volume of the unit * Detention time available * Function : : : : 3. : Graded River sand and Gravel : Down flow. : 6. 9 : Perforated bottom plate with plastic strainers or central headers and laterals. * Under drain * Media * Flow direction 11. / Sq.2 hr / day . CARBON FILTER Vertical down flow type with graded gravel with polystyrenes strainers.m / hr : 1 no : Ion exchange or equivalent : Shall made out of 6 mm thick MS plate and dish end made out of 8 mm thick end plate whole unit shall be given 2 Coats for internal and external with epoxy/enamel-based paint over a coat of epoxy based primer. * Diameter * Depth of media * Test Pressure * Velocity of filtration * Flow rate * Quantity * Make * Material : 600 dia : 600 mm : 5 Kg. * Diameter * Depth of media * Test Pressure * Velocity of filtration : 600 dia : As per requirements : 5 Kg. * Duration of pumping considered : 8. foundation bolts etc. 10.cm : 8 cum / Sq. / Sq. PRESSURE SAND FILTER Vertical down flow type with graded gravel with polystyrenes strainers. m / Hr.* Accessories : Air cock with priming funnel. m / Hr. Flexible Coupling with guard. Base frame.cm : 8 cum / Sq.0 Cu. CHLORINE DOSER : Perforated bottom plate with plastic strainers or central headers and laterals. etc can be used.based paint over a coat of epoxy based primer.2 hr / day * Under drain * Media * Flow direction 12. * Quantity * Make * Flow * Material * Accessories : 1 no.* Flow rate * Quantity * Make * Material : 6. The chlorine demand is calculated based on the ‘break point chlorination’ and to allow residual chlorine of more than 1 mg/l in the treated effluent. The Chlorine can be administered in the form of liquid or solid (bleaching powder) into the treated effluent channel. An automatic electronic metering system can be adopted. In order to disinfect the treated effluent various disinfection methods like chlorination. ozonation. Electronic diaphragm type metering Pump 10 . : Asia LMI / Ion exchange : 0 – 4 Litres / Hour : FRP : Foot valve with strainer. : Ionized Activated carbon with Gravel support : Down flow.m / hr : 1 no : Ion exchange or equivalent : Shall made out of 6 mm thick MS plate and dish end made out of 8 mm thick plate. whole unit shall be given 2 Coats for internal and external with epoxy / enamel .0 Cu. However chlorination is proved to be cheaper and relatively effective. * Duration of pumping considered : 8. Hence the same system is adopted. 0 m & width of the tank= 0.0m SWD 4.2 m) * Total flow * Duration of pumping considered * Pumping rate 13.0m (1m including a free board of 0.16 m x 3.16 m x 3.5 m3/day 24 hr / day 0.25 (For MBR tank) = 95 m3/hr (4.0 m3/Hr @ 10-12m head (50mm pipe dia) : To pump the treated water from the treated water collection sump to Garden and also to toilet flushing over head tank. BLOWER CAPACITY : Blower capacity required : 76 x 1. TREATED WATER SUMP * Stone of the unit * Volume of the unit * Detention time available * Function : 4.456m and depth of 1. 14.5m (Actual Size) : 52 m3 : 25 Hours : To collect & store the final treated (after disinfection) water to pump to either garden or toilet flushing.16 m x 4.729 m3/hr .Detention time = 30 minutes ∴ Volume required = 17.5/24) = 0.16 m x 4.5 X (0. TREATED WATER TRANSFER PUMP * Volume of Treated water * Discharge rate * Function : 50 m3/day : 10.365m3 Provide chlorine contact tank of size.5% extra) 11 : : : 17. 15. Length= 1. 5.5 KSC – 2 Nos. 6. Characteristics of treated effluent 12 .4m x 3. 8. Ht= 0. Note: The capacity of twin lobe roots air blower suitable to discharge about 85m3/hr @ 0. The common blower of twin lobe roots air blower suitable to discharge about 68m3/hr @ 0.Blower capacity required : 60. Pre-filtration & Filtered Water tank+ Sludge Holding Tank).5m SWD 2.6m. ELECTRICALS: Provide & install motor control centre with necessary cabling. complete.cm. bends.9 m x 2. No.5 m SWD 3. Civil Structure Bar Screen Equalization tank MBR Tank Sludge holding tank Prefilteration tank Pressure sand Carbon filter Treated Water tank Filter press Dimension 0.5 x 1.5 KSC – 2 Nos.625m3/hr.5m x 0. 9. Ht= 0. 3. earthing etc.s pressure rating including necessary specials like tee’s. flanges etc.6m 4.16m x 4.0m x 3.4m long 2. elbows. INTER PLANT PIPING Provide PVC pipes of 4-6 Kilogram/sq.9 m x 0.5m 14”x14”x7” 1 1 1 Units 1 1 1 1 1 18.387m x 2.6m D =0.25 (For equalization + Sludge Holding Tank + Treated Water tank) = 75.0m SWD 0.0m SWD D =0. 1. 4. 7. 16. 2.16m x 3. (1W + 1SB) is provided for supply of the air required for other primary.6m.5m x 3.0m x 3.387 m x 3. CIVIL STRUCTURE WITH DIMENSION Sl. 17. (1W + 1SB) is provided for MBR. intermittent & final storage units of the treatment plant (Equalisation Tank.5m x 2. 13 .5 to 7. the treated sewage characteristics will be well within the standards prescribed by Karnataka State Pollution Control Board specified norms for sewage as follows.5 = Absent > Min 1 or >1.As the design includes tertiary treatment units also. < 10 Mg / Ltr. BOD(5 day 200 C) Turbidity pH E-coli Residual chlorine TSS Oil & Grease < 10 mg/l < 2 NTU = 6. but <3 < 20 Mg / Ltr.