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A PRESENTATION ON CONSTRUCTION CONSTRUCTION OF OF SEWAGE TREATMENT PLANT SEWAGE TREATMENT PLANT

Construction of Sewage Treatment Plant

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Page 1: Construction of Sewage Treatment Plant

APRESENTATION

ONCONSTRUCTION CONSTRUCTION

OFOFSEWAGE TREATMENT PLANTSEWAGE TREATMENT PLANT

Page 2: Construction of Sewage Treatment Plant

Objective of STPObjective of STP

The object of sewageThe object of sewage

treatment is to removetreatment is to remove

various contaminantsvarious contaminants

present in sewage so as topresent in sewage so as to

produce an effluent andproduce an effluent and

sludge which can besludge which can be

disposed of in thedisposed of in the

environment without causingenvironment without causing

health hazards or nuisance health hazards or nuisance

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Layout of STPLayout of STP

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Salient Features of the Project Salient Features of the Project

Location: Delawas Sanganer Jaipur.Delawas Sanganer Jaipur. Project agency: Rajasthan Urban Infrastructure Rajasthan Urban Infrastructure

Development Project.Development Project. Construction agency: Vatech Wabag Pvt. Ltd.Vatech Wabag Pvt. Ltd. Consultancy agency: Shah Consultancy Services.Shah Consultancy Services. Project cost:20 corers.20 corers. Project area:90 bigah.90 bigah. Process: Activated Sludge Process. Activated Sludge Process. Capacity: 125 MLD.125 MLD.

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Necessity Of STPNecessity Of STP

Causes health hazards & nuisance.Causes health hazards & nuisance. Contains toxic compounds & heavy metals.Contains toxic compounds & heavy metals. Contaminates ground water through seepage.Contaminates ground water through seepage. Causes health diseases like intestinal infection, Causes health diseases like intestinal infection,

cholera, diarrhea, dysentery, typhoid and cholera, diarrhea, dysentery, typhoid and paratyphoid fever etc. paratyphoid fever etc.

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Task AssignedTask Assigned

To know briefly about the project.To know briefly about the project. To know various units and their procedure.To know various units and their procedure. To understand the drawing.To understand the drawing. Supervision.Supervision. Testing.Testing. To know construction mechanism.To know construction mechanism. Safety measures.Safety measures.

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Material UsedMaterial Used Cement: Sulphate resisting cement for water Cement: Sulphate resisting cement for water

retaining structures and Portland cement.retaining structures and Portland cement. Aggregate: 20mm coarse aggregate &Aggregate: 20mm coarse aggregate &

fine aggregate = sand.fine aggregate = sand. Plasticizers: SP-430 =0.6 L / 100 kg wt. of cementPlasticizers: SP-430 =0.6 L / 100 kg wt. of cement

P211=0.3 L / 100 kg cement.P211=0.3 L / 100 kg cement. Steel: TMT (Thermo Mechanically Treated) steel.Steel: TMT (Thermo Mechanically Treated) steel. Curing compound = Fortex Concure.Curing compound = Fortex Concure. Water cement ratio = 0.45Water cement ratio = 0.45

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Reasons for using TMTReasons for using TMT

Formability.Formability. Corrosion resistant.Corrosion resistant. Weldability.Weldability. Overall economy.Overall economy. Ductility and fatigue.Ductility and fatigue. No residual stress.No residual stress.

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Design MixDesign Mix

Concrete WaterFine aggregate

Coarse aggregate

Plasticizer

M30 22.5 72.5 163.5Sp-430 = 200mlP211 = 150ml

SRC 22.3 71.0 165

M25 21.5 77.35 169.10

Per 50 kg of cement bag

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Steps of ConstructionSteps of Construction

Excavation.Excavation. Compaction.Compaction. Laying of foundation.Laying of foundation. Shuttering.Shuttering. Placement of reinforcement.Placement of reinforcement. Concreting.Concreting. Curing.Curing.

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Excavation of the soilExcavation of the soil

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Compaction of soilCompaction of soil

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Boulders and pieces of stones

Improvement of SBCImprovement of SBC

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PCC of foundation of grit chamberPCC of foundation of grit chamber

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Reinforcement of step footingReinforcement of step footing

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Reinforcement of footing of grit chamberReinforcement of footing of grit chamber

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Foundation of grit chamberFoundation of grit chamber

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Water proofing of footingWater proofing of footing

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Filling of the soilFilling of the soil

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Plywood shuttering

Hoop reinforcement

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Mixing and Weigh Batch MachineMixing and Weigh Batch Machine

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PVC Water BarPVC Water Bar

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Concreting of the DigesterConcreting of the Digester

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Concreting of Secondary ClarifierConcreting of Secondary Clarifier

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Roof water proofing of ADM BuildingRoof water proofing of ADM Building

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TestingTesting

Determination of discharge.Determination of discharge. Compressive strength of concrete.Compressive strength of concrete. Sieve analysis.Sieve analysis. Slump test.Slump test. Hydro test.Hydro test. Vicat’s apparatus test.Vicat’s apparatus test.

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Hydro testHydro test

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Compressive strength testCompressive strength test

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GroutingGrouting

Grouting is used to fill up the cracks in the Grouting is used to fill up the cracks in the water tanks.water tanks.

Grout mixGrout mix:20 liters water + 50 kg cement + :20 liters water + 50 kg cement + admixture.admixture.

Water cement ratio = 0.45Water cement ratio = 0.45 AdmixtureAdmixture: Cebex 100 {0.225 kg cebex per : Cebex 100 {0.225 kg cebex per

bag of cement }bag of cement }

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Sand Blasting ProcessSand Blasting Process

Sand blasting is used to remove or scrub off Sand blasting is used to remove or scrub off the paint painted by the manufacturing the paint painted by the manufacturing company on the pipe surface.company on the pipe surface.

Sand blasting machine consists of Sand blasting machine consists of compressor, compressor, hopper, pipe and nozzle.hopper, pipe and nozzle.

Sand used in the sand blasting ranges from Sand used in the sand blasting ranges from 300µ to 500µ.300µ to 500µ.

Pressure ranges from 200 to 400 mpa.Pressure ranges from 200 to 400 mpa.

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Nozzle

HooperPipe

Sand Blasting ProcessSand Blasting Process

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CheckingChecking

Bar bending and cutting are satisfactory.Bar bending and cutting are satisfactory. Bar spacing are correct.Bar spacing are correct. Bar assembly are rigid and adequately supported.Bar assembly are rigid and adequately supported. Cover to bottom and side bars are correct.Cover to bottom and side bars are correct. Bars are properly tied.Bars are properly tied. Latest revised drawing is used.Latest revised drawing is used. Shuttering is in plumb.Shuttering is in plumb.

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Weigh batch mixer calibrated.Weigh batch mixer calibrated. Approved design mix M30 is used for Approved design mix M30 is used for

concreting.concreting. Vibrating is properly done.Vibrating is properly done. Concrete mix is homogeneous.Concrete mix is homogeneous. Concrete slump checked time to time when Concrete slump checked time to time when

concreting is going on.concreting is going on. Concrete cubes are taken and marked with date, Concrete cubes are taken and marked with date,

element and identification mark.element and identification mark.

CheckingChecking

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Units and their ProcedureUnits and their Procedure

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Control PanelControl Panel

Instrumentation of this process includes instruments for Instrumentation of this process includes instruments for control, operations, monitoring:-control, operations, monitoring:-

. Open Channel Ultrasonic Flow meter for influent. Open Channel Ultrasonic Flow meter for influent . Online magnetic flow meters of sludge flow . Online magnetic flow meters of sludge flow

measurements.measurements. . Ultrasonic Level Transmitters. Ultrasonic Level Transmitters . Pressure Gauges. Pressure Gauges . Dissolved Oxygen measuring system at aeration tank.. Dissolved Oxygen measuring system at aeration tank. . Sludge Density Measurement.. Sludge Density Measurement. . Temperature measurement at sludge digester. Temperature measurement at sludge digester . PH measurements at sludge digester. PH measurements at sludge digester

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Inlet chamberInlet chamber

An inlet An inlet chamber is chamber is provided provided to receive to receive the raw the raw sewage. sewage.

Four gates Four gates are are provided.provided.

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Raw sewage sumpRaw sewage sump

Used to collect Used to collect the water the water coming from coming from inlet chamber.inlet chamber.

Four pumps Four pumps are provided at are provided at the slab to lift the slab to lift the water to the water to top channel.top channel.

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Coarse screenerCoarse screener

Used to screen Used to screen the big the big particle.particle.

Bar Bar width=10mmwidth=10mm

No. of No. of bars=26bars=26

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Fine screenerFine screener Used to screen Used to screen

small particle small particle automatically.automatically.

Bar width=2mmBar width=2mm Spacing of Spacing of

bars=6mm.bars=6mm.

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Grit chamberGrit chamber Diameter of smallest grit particle to be Diameter of smallest grit particle to be

removed = 0.1mm.removed = 0.1mm. Grit removal efficiency = 75%.Grit removal efficiency = 75%.

Parshall flumeParshall flumeUsed to measured the dischargeUsed to measured the discharge

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Primary clarifierPrimary clarifier BOD removal BOD removal

efficiency = 40%efficiency = 40% Depth provided = Depth provided =

4.0 m4.0 m Retention time Retention time

provided = 2hrs.provided = 2hrs. Sizes =2nos.of Sizes =2nos.of

28.8m diameter.28.8m diameter.

Centrally driven

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scrappers

Page 43: Construction of Sewage Treatment Plant

Steel plate

Primary ClarifierPrimary Clarifier

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Aeration tankAeration tank

BOD at inlet of BOD at inlet of aeration tank aeration tank =180mg/l.=180mg/l.

BOD outlet =30mg/l.BOD outlet =30mg/l. Oxygen provided = Oxygen provided =

8.52kg/day.8.52kg/day. It works on the basis It works on the basis

of activated sludge of activated sludge process.process.

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What is ASP ?What is ASP ?

ASP = Activated Sludge Process.ASP = Activated Sludge Process. It is the process based on the providing intimate It is the process based on the providing intimate

contact b/w sewage and activated sludge.contact b/w sewage and activated sludge. Activated sludge is the sludge which is obtained by Activated sludge is the sludge which is obtained by

settling sewage in presence of oxygen so as to be settling sewage in presence of oxygen so as to be enriched with aerobic micro-organisms.enriched with aerobic micro-organisms.

It has property to oxidize the organic matter in It has property to oxidize the organic matter in aeration tank.aeration tank.

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DiffusersDiffusers

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Inside view of Aeration TankInside view of Aeration Tank

PedestalsPedestals

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Blower roomBlower room

Size = 12.65 x 6.0 Size = 12.65 x 6.0 x 5.0ht.x 5.0ht.

5 nos. of blower 5 nos. of blower and each of and each of capacity capacity 3540cum/hr.3540cum/hr. Blower

Air filter

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Secondary clarifierSecondary clarifier

Sizes = Sizes = 2nos.of 2nos.of 40m dia.40m dia.

Retention Retention time = time = 2.25hrs.2.25hrs.

Peripheral driven

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scrappers

View of Sec. ClarifierView of Sec. Clarifier

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Outlet chamberOutlet chamber

1200 mm dia. Pipe is 1200 mm dia. Pipe is used for effluent used for effluent discharge to amanisha discharge to amanisha nala.nala.

Testing chamber is Testing chamber is constructed for testing constructed for testing the effluent water.the effluent water.

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Sludge digesterSludge digester

Size = 2 nos Size = 2 nos 25.65dia x 6.0m.25.65dia x 6.0m.

Retention in Retention in digester = 20daysdigester = 20days

By anaerobic By anaerobic process methane process methane gas will be gas will be produced.produced.

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Safety MeasuresSafety Measures Helmet, gloves and safety shoes should be weared.Helmet, gloves and safety shoes should be weared. During sand blasting person should wear mask and goggles.During sand blasting person should wear mask and goggles. Barricading along the trenches.Barricading along the trenches. The construction site should be properly managed for The construction site should be properly managed for

storage of materials and equipment; and removal of scrap, storage of materials and equipment; and removal of scrap, waste and debris at appropriate intervals. waste and debris at appropriate intervals.

Scaffolds shall be provided for all work that cannot be safely Scaffolds shall be provided for all work that cannot be safely performed from the ground, or from solid construction or performed from the ground, or from solid construction or other equally safe and suitable provision should be made.other equally safe and suitable provision should be made.

Elevated workplaces should be provided with safe means of Elevated workplaces should be provided with safe means of access and egress such as stairs, ramps or ladders. access and egress such as stairs, ramps or ladders.

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RecommendationRecommendation

Effluent can be used for ground water Effluent can be used for ground water recharging.recharging.

Systematic irrigation.Systematic irrigation. Production of biological manure.Production of biological manure. Electricity production.Electricity production. Cooking gas.Cooking gas.

Page 55: Construction of Sewage Treatment Plant