5. ENVIRONMENT MANAGEMENT PLAN

Transcription

1 5. ENVIRONMENT MANAGEMENT PLAN The environmental management plan consist of the set of mitigation measures, management and, monitoring measures to be taken during construction and operation phase to eliminate adverse environmental impacts, offset them or reduce them to acceptable levels. The present Environmental Plan addresses the components of environmentally affected area during construction of the project and by the different activities forming part of the processes. The details of the project and the impact assessment described in last chapter signify following impacts: 5.1 AIR ENVIRONMENT Construction Phase: Dust generated due to construction activity. Barricades will be put up all around the site, which prevents blowing of dust Water will be sprinkled at regular intervals to suppress the dust Vehicles carrying cement, soil etc should be covered with tarpaulin sheets to prevent the emission of dust Operation Phase: Emission from DG sets during Operation Phase: The sources of air pollution along with the pollution control measures adopted during the operation phase are as follows: DG Set of 630 KVA of 5 No for which chimney of 5 m ARL is proposed Low Speed Diesel will be used with a Sulphur content less than 0.05% 5.2 WATER ENVIRONMENT & MANAGEMENT Construction Phase A. Water for Construction: 100 KLD of treated grey water is required for construction purpose

2 B. Drinking Water for Laborers: 9 KLD of Fresh water for Labour consumption will be supplied through Tankers. The wastewater generated of 7.2 KLD from the labour activity will be taken to a Mobile Sewage Treatment Plant OPERATION PHASE: Population Estimation & Water Requirement Total Built up Area= 107, m 2 No. of floors Tower1, 2, 3 & 4-2 Basements + Ground + 18 Upper Floors The waste water quantity generated from domestic sources is KLD Wastewater Disposal with treatment scheme Sewage Treatment plant of 330 KLD is proposed for this project, in order to conserve the wastage of fresh water. In the proposed project, package type of STP is envisaged, since the discharge is nominal. Treated water can be used for flushing and gardening purposes. Proposed quality of raw and treated sewage is as below Parameters Domestic Sewage Treated Sewage ph 20 0 C Turbidity, NTU E.Coli Res.Cl 2, mg/l mg/l Present <10ppm < 2 None >1 Sequential Batch Reactor Principle The sequential batch reactor (SBR) process is a cyclic activated sludge treatment process. Multiple reactors are provided to treat the wastewater in batches like Pressure sand Filter and Activated Carbon Filter. Sequencing batch reactors will be operated to oxidize carbonaceous

3 BOD, nitrify the ammonia and denitrify to reduce total nitrogen to a level that meets the permit limits. All treatment processes including equalization, aeration, de-nitrification, and sedimentation and decanting occur in the SBR s eliminating the need for separate clarification and return activated sludge systems. The typical SBR treatment sequence for nitrification de-nitrification systems is as follows: 1. The reactor is allowed to fill with raw wastewater. The filling phase is often divided into stages that include aeration to reduce BOD and to nitrify ammonia and then mixing without aeration to promote de-nitrification (removal of nitrogen). 2. A reaction phase is generally provided to promote additional biological treatment. 3. A settling or quiescent phase the follows to allow biological solids to settle. 4. A decanting phase is provided to draw off the clarified effluent from the upper portion of the reactor 5. Often a small idle phase is provided to allow time for miscellaneous operations that may need to occur to keep the reactors in sequence. Wasting of the biological solids that are produced by converting BOD to bacteria needs to occur periodically to maintain the design mixed liquor concentration and sludge age. Wasting can occur at any time in the process sequence. Frequently, wasting is performed following the decant phase when sludge concentration is highest or during react phase when the sludge concentration is consistent. The SBR s will be equipped with diffused aeration and decanting facilities. The discharge from SBR systems is higher than the inflow because the same volume of water that entered the SBR is discharged over a shorter time period. The treated water from SBR is pumped through the Pressure sand filter and Activated carbon filter for removal of suspended solids, final polishing and removal of any traces of color. The effluent is then disinfected with Chlorine by intermittent dosing system. The treated sewage can be used for flushing purposes. Excess sludge from SBR tank is pumped out periodically to the Sludge holding tank and then fed in to the Filter press for dewatering and drying during decanting phase.

4 Water Balance Chart Municipal water Fresh water 191KLD Flushing water 131 KLD Roof water 90 cum/day (Seasonal) Total water 412 KLD 80% Diversity factor Waste water generated KLD Sewage Treatment Plant 330 KLD 95% Recovery Landscaping 53 KLD Cleaning of paved area 20 KLD Car washing KLD KLD will be let in to existing UGD/Parks/ nearby Rain Water Harvesting Plan:

5 Keeping in mind the importance of water and it scarcity it is proposed to conserve water by rainwater harvesting by which the subsoil water condition / moisture content is maintained / improved to a great extent. Also it is proposed to harness rainwater from the terrace area by collecting the same in a rainwater collection sump of suitable capacity and re-used for domestic purposes with the provision of a filtration unit. The capacity of the storm water collection sump is indicated below: Storm Water Management: Land Area in Sqm = Sqm Terrace Area in Sqm = Sqm Other Podium / Hardscape / Driveways = Sqm 1a) Roof Top Rain water Harvesting / Storage System Note: As per BBMP guide lines Rain water storage tank of minimum 20 liters/sqm of roof area has been considered. Terrace Area in Sqm = Sqm Therefore, Rain water storage tank capacity in cum = Terrace Area in Sqm x 20 liter = Liter = 86 Cum Approximately, Rain water Storage tank capacity considered is = 90 Cum 2a) Rain water Recharging System Note: BBMP regulations specify a minimum capacity of 10 liters per Sqm of open space area to be provided. Open Area in Sqm (Green+ podium + Hardscape +driveway area) = Sqm Therefore, Volume of rainwater available for recharging is = Open Area in Sqm x 10 liter = Liter

6 (a) Recharge Pit Calculation Data assumed: Dia of Deep recharge well Depth of storage well Volume of storage well Volume of water recharged per pit = Cum 1.5 M 4.5 M 3.14*r*r*h Cum/hr Total number of Recharge pits required Total number of Recharge pits provided Amount of water percolating through the Recharge pits Excess water will find its way to external storm water drain. 29 Nos 13 Nos Cum 120 Cum SOLID WASTE MANAGEMENT Construction Phase Excavated Earth: 1 Total excavation quantity = 115,000 m 3 1, Quantity of earth for foundations backfilling = 7,500.00m 3 2, Quantity of earth for road formation and site gradation = 12, m 3 3, Quantity earth for filling on podium= 10, m 3 4, Quantity of earth for landscaping = 10, m 3 5, Quantity of earth disposed outside the site without any adverse effect on the environment= 75, m Operation Phase: Domestic garbage generated from the proposed project is envisaged to be disposed through Trash bins, Trash cover collection system & then through the BBMP Garbage collection Trucks for further disposal. Domestic garbage would be segregated into Organic and Inorganic wastes and then kept ready for disposal. The volume of garbage produced from the Project is worked out as per the guidelines of IS

7 QUANTITY OF SOLID WASTE GENERATED: Quantity of Organic Refuse = 0.27 Kg/Person/day Quantity of Inorganic Refuse = 0.20 Kg/Person/day Total number of persons = 3190 Treatment & Disposal: Sl. No. Description of Waste Quantity Method of Collection Mode of Disposal 1 Inorganic waste BBMP Authorized Manual 0.64 T/Day recyclers 2 Organic waste Bio converter Manual 0.86MT/Day 3 STP Sludge 16.50Kg/Day Mechanized On Own Land for Gardening 5.4. MANAGEMENT OF AMBIENT NOISE LEVEL CONSTRUCTION PHASE: Noise generated during Construction Activity: Construction activity It is a temporary phenomena; however barricades will be put up all around the site to control Noise Pollution. DG sets Acoustic Enclosures will be provided OPERATION PHASE: Noise from DG Sets: Ambient noise from the D.G. Sets shall be controlled by providing suitable acoustics 5.5. POWER REQUIREMENT Energy Requirement

8 Description Total requirement Source Alternate source Chimney height Details 3,790KW BESCOM DG Set of 630 KVA of 5 No s Chimney of 5 m ARL Following Energy conservation measures are proposed to reduce to Energy: Savings in power Using LED as against Fluorescent Lamps 45% Energy Saving by using copper wound transformers. By providing solar backup Savings in power loss using HF ballast By using automatic timer control for hourly based operation.