proposed integrated complex for delhi judicial academy

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Rapid Environmental Impact Assessment (REIA) Study for Proposed Integrated Complex for Delhi Judicial Academy, National Law School, and National Institute for Mediation & Conciliation at Dwarka, New Delhi During Construction The major source of water pollution during project construction phase will be sewage from labour camps and makeshift office. It is expected that at any given time during the construction phase, the peak manpower strength on construction site comprising of technical staff, clerical/supervisor, skilled and unskilled workers would be about 1500 persons. The average domestic water requirements would be about 50 lpcd. Thus, total water requirements work out to be 75,000 litres / day (max.). It is assumed that about 80% of the water required will be generated as sewage. Thus, total quantum of sewage generated in peak situation is expected to be about 60,000 litres / day. The generated sewage would pass through a septic tank and its discharge would be connected to the existing municipal sewage network of the area. During Operation The major source of water pollution during project operation phase will be the wastewater from the academic and residential complex. During project operation phase, due to the absence of any large scale construction activities, the cause and source of water pollution will be much different. It is expected about 235 m 3 /day of sewage will be generated. The expected characteristics of the untreated wastewater will be as given in Table 5.3. The total BOD loading without treatment will be of the order of 35 to 60 kg/day. This is significant to cause any adverse impact on any receiving water body. The impacts that may occur due to disposal of untreated sewage will be mitigated as a result of commissioning of adequate sewage treatment plant (STP) in the proposed facilities. Table 5.3 Expected Characteristics of Untreated Wastewater S. No. Parameters expected value 1. Color Turbid / Grey 2. pH 5.5 – 6.5 3. Oil and Grease 15 – 30 mg/l 4. Total Suspended Solids 180 – 260 mg/l 5. Total Dissolved Solids 1000 – 1300 mg/l 106
Rapid Environmental Impact Assessment (REIA) Study for Proposed Integrated Complex for Delhi Judicial Academy, National Law School, and National Institute for Mediation & Conciliation at Dwarka, New Delhi 6. BOD 3 @ 27 o C 150 – 250 mg/l 7. COD 275 – 450 mg/l It is proposed to treat the wastewater through a full fledged decentralized STP based on Aerobic Fluidized Bed Reactor Technology. The STP will be set up for a mean daily flow rate of 10.42 m 3 /hr., peak hourly flow rate of 20 m 3 /hr., and minimum flow rate of 4.5 m 3 /hr. The system will consist of a collection cum equalization tank where the waste water will be received and homogenized and equalized for the continuous operation of the treatment plant. It will be followed by primary clarifier to remove most of the suspended solids from the wastewater. The wastewater thereafter will flow to aerated fluidized bed reactor for the biological oxidation of the organics to reduce BOD and COD and also to reduce the bacterial population by order magnitude. A secondary clarifier will separate the microorganism in the form of biological sludge to be recycled back to the aeration chamber. A sludge collection sump will be provided to collect the sludge. A sludge pump will dewater the sludge with a provision for recycle of sludge to the fluidized bed reactor during start up. Sludge filtration system will be provided in the form of filter press. Treated wastewater will be chlorinated in the disinfection tank. An intermediate treated water storage tank will be provided for further tertiary treatment. The treated wastewater in tertiary treatment will pass through pressure sand filter for the final clarification. Activated carbon filter will be provided to remove the final traces of organic matters and make it suitable for reuse within the campus. A collection tank will be provided for collection and storage of the clear tertiary treated waste water for reuse within the campus. The disinfection will be carried out by means of chlorination. This will be done by the hypochlorite solution as the chlorinating agent. The hypochlorite solution is easily available in different concentration ranges with free chlorine content of 10% or more and is quite easy to handle because of operation at ambient pressure and being able to pump the liquid by means of normal dosing pumps. The treated wastewater will be used for flushing of toilets and in horticulture purpose within the proposed complex. The expected characteristics of the treated wastewater after secondary and tertiary treatment process are given in Table 5.4. 107
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