Environmental Impact Assessment - Municipal

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EA for the Proposed STP Project Description 2.6.1.2 Treated Sewage Standards The treated sewage has to be disposed into natural drains. The table below lists the characteristics for discharge of treated sewage into inland waters. Note: All values are in mg/l except 1 & 9. Table 2.6 Characteristics of Treated Sewage S.NO PARAMETERS VALUE 1 pH 5.5 – 9.0 2 BOD < 20 3 COD < 250 4 Oil & Grease < 5 5 Total Suspended Solids < 30 S.NO PARAMETERS VALUE 6 Nitrate Nitrogen (as NO3) ≤ 5 7 Ammonia Nitrogen (as N) < 50 8 Total Phosphorus (as PO4) < 5 9 Total Coliform ≤ 1000 no/100 ml 2.6.1.3 Treatment Technology & Treatment Plant Design Criteria The treatment technology is based on Activated Sludge Process (ASP). Sewage will be given pre-treatment by screening and grit removal followed by biological treatment. Design of the pre- treatment units is done following the norms set in the CPHEEO Manual. 2.7 PROPOSED SEWAGE TREATMENT PLANT 2.7.1 General The portion of the town considered to be benefited from 4.86 MLD Sewage treatment plant is fairly densely populated. Out of 33 municipal wards, it is proposed to cover 19 municipal wards under this project. Branch and lateral sewers will be provided in these wards, where necessary facilities for 6000 house connections will be provided. 2.7.2 Design Basis Average flow is 4.86 MLD. Dharmapuri <strong>Municipal</strong>ity 28 Pure Enviro
EA for the Proposed STP Project Description 2.7.3 Detailed Proposals 2.7.3.1 Pretreatment Works The pre-treatment works include Receiving chamber Coarse screen chamber Fine screen chamber Grit chamber 2.7.3.2 Receiving Chamber The Domestic sewage from the town ship is collected in collection tank and pumped to the receiving chamber. At a head of 15 meters reaches the receiving chamber by means of pumping. Then the effluent flows through the coarse screen chamber by gravity. 2.7.3.3 Coarse Screen Chamber From receiving chamber, the sewage flows by gravity in to the Coarse Screen for removal of suspended solids up to 25mm particle size. The application of the coarse screen is removal of coarse solids such as sticks, rags, and other debris in untreated municipal sewage by interception. Coarse screens are used to protect pumps, valves, pipelines, and other appurtenances from damage or clogging by rags and large objects. Manual and mechanical cleaning system will be used. 2.7.3.4 Fine Screen Chamber The sewage free from floating solids flows to fine screen chamber by gravity were particle size up to 6 mm are removed. The materials that are retained on screens with openings of 6 mm include small rags, paper, plastic materials of various types, razor blades, grit, food waste, feces, etc. Angle of inclination is 40 0 . 2.7.3.5 Grit Chamber After removal of fine and coarse solids, the sewage having grit particles are removed in the grit chamber. Grit chamber is designed to remove grit, consisting of sand, gravel, cinders or other solid materials that have subsiding velocities or specific gravities substantially greater than those of the organic putrescible solids in wastewater. Grit removed particles are collected automatically through clarifier mechanism. Classifiers are provided in Square Horizontal-flow Grit chambers. Dharmapuri <strong>Municipal</strong>ity 29 Pure Enviro
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Environmental Impact Assessment - Municipal

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