Oct - Dec 2009 • Vol. No. 32 Issue No. 2 • - L&T Construction

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ECC Concord Oct-Dec 09 26 Pulsator Clarifier Parameters Quantity Pulsator clarifier : 9 nos Design flow : 400 mld Settling velocity over sludge blanket : < 3 m/hr Settling velocity over total area : 2.55 m/hr Size : 29 m x30m x 5.45m each Plan Area : 7830 sq.m Total length of walls : 117 m wall of 5.45 height Concrete : 10560 cu.m Form work : 46370 sq.m Reinforcement : 828 t Main characteristics A single layer of homogeneous sand, having depth according to the filtration rate - a large water depth above the sand level A simultaneous air scour and backwash with water without expansion of the filter bed. Water enters each filter through a Penstock Gate with a negligible head-loss and is fed above the wash-water evacuation trough which it is submerged during the filtration Parameter Filter Annexure Building : 1 no Size : 19 m X 20m X 14 m two storied building Concrete : 700 cu.m Equipments Root Blowers : 3 nos Filling Pumps : 3 nos Electrically Operated Train (EOT) : 2 t Over Head Tank (OHT) : 2000 cu.m The air scour blowers, wash water filling pumps, chlorination pumps and the compressed air production units are located in the filter annex building. Recycling At the end of each backwash, the waste wash water will gravitate to the recycle tank (usable capacity 720 cu.m) located close to the filter battery. After settling, the supernatant is pumped by submersible pumps to the inlet and the settled sludge is pumped via flocculator to the thickeners. Chlorine mixing The filtered water channel is extended from filter battery to chlorine mixing sump, provided with baffles. Chlorine for final disinfection is The filtered water, evacuated through a large added into this sump at the end of the filtered water number of nozzles is collected in a central, channel. concrete channel located below the washwater evacuation trough Sludge treatment is sized taking into account the Each filter outlet is fitted with air actuated raw water flow. However, the backwash water / regulated butterfly valve sludge from the clarifiers flow to different The filter also includes two V-shaped, submerged troughs (hence its designation as AQUAZUR V filter) built along the side walls storage sumps and then pumped to flocculator cum distribution chamber of thickeners. The sludge flows to clarifier sludge sump by which enables surface sweeping during the gravity and mixes with the reserved water. The washing sequence Sludge from storage sump is lifted to the
Sludge treatment Clarifier sludge sump : 2 Method of receiving sludge : Gravity Inlet suspended solid content : 50 mg/ litre Sludge inlet to thickeners : 22962 kg/day 2 Solid loading rate : 50 kg/m /day Sludge thickeners : 2 nos Size :18 m dia x 3.5 m Sludge drying bed : 61 nos Size : 30 m x 10 m Concrete : 3300 cu.m Formwork : 8300 sq.m Reinforcement : 320 t Submersible centrifugal pumps : 4 nos Poly electrolyte pump : 2 no Positive displacement pump : 2 no Pulsator Clarifier at the treatment plant flocculator cum distribution chamber by submersible centrifugal pumps. After thickening, the sludge is disposed over the sludge drying bed. The sludge treatment infrastructure includes: Two Clarifier Sludge Sumps, which receive all the sludge from clarifiers by gravity. - One recycle tank for backwash wastewater. - One flocculator cum distribution chamber for the thickeners - Two thickeners that enable the sludge thickening process - Sludge drying beds. Ajoy Bhattacharya Project Manager K. Vijayakumar Manager (Commissioning) 27 ECC Concord Oct-Dec 09
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Oct - Dec 2009 • Vol. No. 32 Issue No. 2 • - L&T Construction

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