Environment Management Plan. Project: CONSTRUCTION OF RESIDENTIAL ROW HOUSES TANMATHRA AQUARELLE

Transcription

1 Environment Management Plan Project: CONSTRUCTION OF RESIDENTIAL ROW HOUSES TANMATHRA AQUARELLE Project site At, Sy.No. 114, 115 & 116 ThindluVillage, Sarjapura Hobli, Anekal Taluk, Bangalore (S) Karnataka. Proposed by, M/s. Tanmathra Aquarelle # 523,2nd Floor 24th main Road, HSR Layout, Sector-2 Bangalore Karnataka

2 Table of Content 1.1 Need for EMP 1.2 Environmental Management Plan during Construction phase Air Quality and Dust Control Water pollution control measures Noise pollution control measures Vibration control Solid Waste Management System Parking and Traffic Management Energy conservation Aesthetics 1.3 Environment Management Plan during Operation phase Air Quality and Dust Noise pollution Control Measures Vibration Control Energy Conservation Measures Solid Waste Management Water Resource Management Water Pollution Control Traffic Control Measures 1.4 Landscape Development

3 Environment Management Plan 1.1 Need for EMP Environmental Management Plan (EMP) is a programme prepared with a purpose of systematic implementation by a commitment to preservation of environment by application of systems. EMP aims at maximization of environmental benefits of the site and amelioration of the negative environmental impacts of the proposed activity. The EMP prepared for the proposed project intends to formulate activity-specific mitigation measures at source level and an overall management plan to improve the supportive capacity of the immediate environment in which the project is developed. This section deals with the environmental measures proposed to protect the environment due to the likely impacts of proposed project. 1.2 Environment Management Plan during Construction Phase Air Quality and Dust Control Dust emissions during construction phase primarily will be during excavation, land levelling, construction, handling of construction materials, movement of vehicles carrying construction materials, DG operations etc. This will lead to a slight increase in PM levels. Other emission parameters comprising SO2 and NOX also will show slight increase in their levels during this phase at site due to DG operation and vehicular movement. All vehicles, equipment and machinery used for construction shall be regularly maintained to ensure that the pollution emission levels confirm to the pollution control standards specified in EP Act, Effective transportation route shall be used to avoid long routes. Emissions from the DG set shall be effectively controlled by means of providing adequate stack height and regular maintenance. Stockpiles of aggregate or spoil shall be covered with empty gunny sacs and sprinkled with water. The construction materials with possibility of dust generation will be stored in well planned and organized stores at the site. All dust generating materials shall be sprayed with water prior to any loading, unloading or transfer operations. Vehicles delivering loose and fine materials like sand and fine aggregates shall be covered to reduce spills on roads and dust generation. The height from which excavated materials are dropped shall be controlled to a minimum practical height to limit fugitive dust emission from unloading. Debris chute will be used for bringing down debris/waste from higher floors which will reduce dust generation to a great extent. Geo membrane fabric will be used around the scaffoldings to minimize dust dispersion during construction activity. Landscaping shall be initiated in the available free area during construction stage itself to avoid dust generation. Random ambient air quality monitoring shall be done to ensure that the air quality is within the prescribed standards Water Pollution Control Measures Approx. 20 kld water will be required which will be abstracted from treated water tankers for construction and fresh water tankers for domestic use. Water Conservation Curing shall be done with the help of spray nozzles. Gunny bags/hessian cloth shall be used for retaining curing water on the concrete surfaces. Leakage of pipes & pumps transporting water on the site shall be checked regularly. Fuel oil, grease and lubricants shall be stored in their containers in designated storage yards to contain and control spillages.

4 Storm Water Management To avoid the loss of soil during monsoon, major construction activities involving earthwork will be avoided during rainy season. The natural catchments of the existing drains will not be disturbed in the project. After required re-filling of the excavation after foundation concreting is carried out, the remaining soil will be over laid on the remaining area of the plot to maintain a gentle grade of 1 in 10 to 1 in 15. The soil will be compacted and paved with concrete paver blocks. All minor trenching for gutter lines and shallow plumbing/cabling after final site grading is completed will be done under kaccha brick wall containment. All potential contaminants such as lime, paints, whitewashes, shuttering lining tars, grease, oil, solvents, etc, will be decanted/handles on the impervious PCC floor of the construction warehouse. The warehouse will be closed type with no chance of rainwater meeting the material Noise Pollution Control Measures During construction, noise is expected from the movement of construction machineries, equipments, fabrication, and construction activity. To avoid noise pollution, all construction equipment shall have noise control measures. Use of sound generating equipment/ construction machinery having sound not greater than 90 db(a) will be restricted during night hours. All the activities shall strictly conform to the noise standards specified in EP Act, On-site DG set shall be covered with an acoustic enclosure and shall conform to the noise emission standards. The DG sets will be in restricted use and operated only in case of power supply shortage. Workers working near noisy machinery will be issued ear muffs/ear plugs and their usage will be ensured. Servicing of all construction vehicles and machinery shall be done regularly and during routine servicing operations, the effectiveness of exhaust silencers will be checked and if found defective will be replaced. Vehicles hired for bringing construction materials at site will conform to the noise emission standards and shall be operated during non peak traffic hours as far as possible. The entry/ exit to the site will be with adequate curvature so that vehicles coming out/ entering the building do not impinge on road traffic directly. Buffer in form of wall will be provided along the plot periphery to act as sound barrier. Noise monitoring shall be conducted at suitable locations at periodic intervals to check compliance to the stipulated standards. Data shall be reviewed and analyzed by the project manager and strict measures will be taken if the results are beyond limits Vibration Control Vibration is generally associated with noise during civil construction operation. The basic reason for the vibrations from construction machinery are imbalance, misalignment of shaft, damage to bearing, fault or misalignment of gears or any other mechanical loss. Noise, Vibration and Harshness will be controlled through proper periodic maintenance of the construction machinery and transportation vehicles Solid Waste Management System Following measures will be taken to minimize the impacts caused by transportation & handling of materials during construction: 1. Materials will be purchased from the nearest authorized supplier. 2. Transportation of construction material will be done in covered trucks. 3. The movement of these vehicles will be restricted only during non-peak hours.

5 4. Water will be sprinkled on the site to prevent dust emissions. 5. Barricades will be raised along the boundary of the plot to prevent noise pollution. Construction waste will be segregated and reused as a base material for the roads and pavements. Recyclable waste will be sold to scrap vendors Parking and Traffic Management As the project size is small, no much traffic is envisaged during construction phase, it is estimated that maximum of 5-10 trucks will be operated during the construction phase. Movement of trucks and heavy vehicles shall be during off peak hours Energy Conservation Materials with recycled content are proposed to be used to reduce environmental impacts. All structures are designed with minimum use of glass, granite & aluminium composite panel. Recycled material will be used for concrete & building material. Bricks, metal, chips, cut tiles will be used for internal paving Aesthetics All construction activities will involve the use of a variety of construction equipment, stockpiling of soils and materials, and other visual signs of construction. While evidence of construction activity would be noticeable in the vicinity, such visual disruptions would be short-term and are a common and accepted feature of the urban environment. 1.3 Environment Management Plan during Operation phase Air Quality and Dust Control The major source of air emissions during operation phase being vehicular movement. The gaseous emissions from the DG sets in case of power supply shortage could be another source of pollution. All DG sets will be operated with HSD as base fuel. Effective stack height for the DG sets shall be provided for proper pollution dispersion. Open area shall be covered with grass Noise Pollution Control Measures During constructional phase, the noise generation is expected from vehicular movement and machineries in operation. All equipments shall meet stipulated noise emission standards. Ambient noise levels shall be periodically monitored to determine compliance with the norms. Noise levels will also be monitored at point sources for occupational noise hazards. All noise generating sources shall be equipped with appropriate noise control systems. Silent DG sets will be used. Further the DG sets will only be operational during emergency. Vehicular movement will be another main source of noise generation from this project. Proper parking facilities and traffic management shall be done in order to avoid any kind of unnecessary noise within or near by the site Vibration Control Vibration, principally associated with noise, is generated when any kind of mechanical loss or damage to the machineries such as pumps, DG set, etc. is caused. The foundations of such machineries shall be appropriately designed in order to keep its balance and eliminate vibrations. Periodical monitoring and maintenance of all the construction machinery shall be done Energy Conservation Measures Building envelope will be designed for:

6 Reduced heat load into buildings with building materials of lower heat capacity, lower U- value (heat transfer co-efficient), lower Solar Heat Gain Co-efficient (SHGC). Optimize façade shading for reduced heat load but utilize daylight for operational lighting energy consumption. The energy performance of a building can be achieved through i) incorporation of solar passive techniques ii) adoption of energy efficient lighting and ventilation systems and iii) through the use of renewable energy systems to reduce a part of the total building load. Adaptation of various solar passive techniques, like landscaping, optimum building orientation, glazing type, shading of windows and proper selection of building materials will help in conserving energy Solid Waste Management Solid waste from different sources during operation phase is given in following Table 1.1. Table 1.1 Solid waste generations during Operational Phase Sr. No Category of waste Major waste content 1 Residential waste Garbage, plastics, tins, paper 2 Street sweeping Dust and grit, dry leaves, grass, food, glass, metal 3 Horticultural waste Grass, tree trimming, dry leaves The solid waste management shall be based on the concept of segregation at source. Separate bins shall be provided for the collection of different types of waste. Organic waste will be composted in organic waste convertor and used as manure as per requirement. Quantity of Solid Waste Estimated It is estimated that about 434 kg/day of solid waste will be generated from the project. The detailed classification of solid waste with quantity is shown in the Table 1.2 below: Table 1.2 Solid wastes Calculation Operation Phase Sr. No Description Quantity (kg/d) 1 Assumed per capita MSW generated at 0.45 kg/person/day for 488 population of Organic Waste by (50%) kg/day Inorganic waste by (40%) kg/day Inert waste by (10%) kg/day 49 The biological sludge generated from the sewage treatment plant will be used as manure. Collection and Storage of Solid Waste The solid waste shall be segregated as dry and wet (bio degradable) at source itself. The wet degradable waste shall be taken to the OWC room for shredding and feeding into the OWC for composting. The dry waste will be segregated into recyclable and non recyclable in the service storage area. Recyclable shall be sold to authorized recycler Water Resource Management All efforts to conserve water to comply with the standards of water conservation practices shall be made. Rainwater harvesting for optimum utilization of rainwater to recharge the ground water level as well as direct use for domestic used will be adopted. Well designed storm water network will be set up to collect the rain water from the site area and divert it to the proposed rainwater harvesting pits for recharging the ground water. Roof top water will be collected in sumps and

7 used for domestic purpose after filtering. Appropriate water conservation measures will be adopted in regular activities. The domestic sewage generated from the Apartment will be linked to STPs being set up on-site. Treated sewage will be reused for flushing of toilets, landscape irrigation etc. and thereby help to reduce fresh water consumption in the project Storm Water Management The Project site is located in an elevated area within the Corporation limits. Proper sewerage and storm water network is available where the site is located. Necessary structures will be developed for efficient storm water management on the site as discussed below. a. Perimeter Drain A square section PCC perimeter drains will be constructed on the inner periphery of the plot on more-or-less the same trench alignment of the of the inner temporary perimeter drain. The drain will be completely open, covered with MS grating for easy cleaning. Feeder drains with suitable slopes between the building blocks will be constructed which will meet the inner perimeter drain by open T joints. The feeder drains will also be open, covered with MS grating. Existing outer perimeter drain will be cleaned and de-silted before onset of monsoon and will be cleaned during monsoon if required. b. Permanent Controls Inner and outer peripheral drains, drain section at the entrance of the plot, feeder drains, outlet into the outer peripheral drain and active-basement pumping drainage as described in the above sections as management controls will be provided Rain Water Harvesting System The Rainwater Harvesting System proposed will have two types of collection: a. Rooftop rainwater will be collected by down take pipes, filtered and collected in domestic sump. The water will be used as domestic water source and additional if any will be let into the recharge pits. b.storm water from roads, ramps, garden and other open areas will be collected by the feed drains to the peripheral drains intermittent with recharge pits Water Pollution Control a. Sewage Treatment The wastewater generated from the Row houses and the club house includes both night soil and sullage. The total quantity of waste water generated per day is estimated to be about kld. The project proposal is prepared in order to treat liquid wastes from kitchen, bathrooms, floor wash, etc. in the Sewage Treatment Plant of 200 kld with well trained Plant Operators. The STP Treated water approx kld meeting the KSPCB norms will be an important resource for utilization in horticulture, flushing and miscellaneous washing and usages. This would reduce the load on corporation supply. Sewage Generation and Disposal Systems The total quantity of wastewater generated is worked out as shown in the Table 1.4 below:-

8 Table 1.3: Calculation of Water requirement and Wastewater generation Total wastewater generation will be around kld. This will be treated in an STP of 200 kld proposed at site. The treated water shall confirm the land disposal criteria of KSPCB kld of treated wastewater will be used for flushing and horticulture. The excess treated water will be let into the UGD line/ Farming land. The basis of calculation is as follows. Water requirement and waste water generation Qty (Kld) Residential No. of Dwelling Units (nos.) Estimated peak occupancy (nos.) persons/unit * Fresh Water 100 lpcd % of the freshwater required Recycled Water 35 lpcd Sewage 100% of Recycled water Club House Daily peak Club occupancy estimated 10% of total occupants Fresh water 35 lpcd % of the freshwater usage 3.41 Recycled water requirement for 1 out of 3 35 lpcd 1.26 Sewage 102% of Recycled water 1.26 Car Wash Recycled water requirement for car 20lit/day 4.34 Evaporation and other losses 50% of water used 2.17 Waste water 50% of water used 2.17 Horticulture Green area on Natural earth (m 2 ) 5, Water 6 l/sqm 31.7 Total Water required Total Fresh Water requirement Recycled Water requirement 73.1 Total Waste Water to STP % of total Waste Water is Atmospheric losses 1.8 Sludge - 3% of total waste water lost with wet sludge % of total waste water Excess recycled water to UGD/Farming 96.5 STP Capacity-10% more than total waste water 200 TECHNICAL WRITE- UP FOR 200 KLD SEQUENTIAL BATCH REACTOR INTRODUCTION Sewage treatment is the process that removes the majority of the contaminants from wastewater and produces both a liquid sewage suitable for disposal to the natural environment or reuse and sludge that can be used as manure. To be effective, sewage must be conveyed to a treatment plant by appropriate pipes and infrastructure and the process itself must be subject to regulation and controls. Other wastewaters require often different and sometimes specialized treatment methods. At the simplest level treatment of sewage and most wastewaters is through separation of solids

9 from liquids, usually by settlement. By progressively converting dissolved material into solid, usually a biological floc and settling this out, a sewage stream of increasing purity is produced. With ever-growing population and rise in living standards, urbanization and industrialization the demand of water has increased rapidly. The total supply of fresh water is itself limited by the nature and at the same time, drought, depletion of aquifers, deforestation and pollution have reduced the availability of good water. On the contrary, providing safe and sufficient drinking water and proper sewerage system remains as the challenging tasks for many developing countries particularly so, in urban areas. OBJECTIVE OF THE REPORT The primary objective of preparing this report is to identify sources of pollution and to treat from the proposed group so as to evolve a technically feasible and comprehensive treatment of Sequencing Batch Reactor in wastewater system. a) To enhance the design and operation of SBR s that will ultimately provide more effective wastewater treatments. b) To estimate the quantity of influent wastewater generated from the building and to define sewage requirements in the process of planning and upgrading the current operations. c) To understand present method of collection and treatment of wastewater. d) To understand the method of disposal of wastewater after treatment. The goal of the technical write-up is to provide operational information and design considerations to enhance SBR treatment performances. TREATMENT METHODOLOGY OF SEQUENCING BATCH REACTOR The SBR (Sequencing Batch Reactor) process utilizes fill and draw reactor with complete mixing during batch reaction step (after filling) and were as the subsequent steps of aeration and clarification occur in same tanks. The SBR is a conventional activated sludge system with common steps carried: - 1. Fill 2. React (aeration) 3. Settle (sedimentation/clarification) 4. Draw (decant) 5. Idle

10 SBR Design and Operational Conditions The description of operational steps for SBR is as follows: - Fill During the filling operation, volume and substrate (raw wastewater or primary sewage) are added to the reactor. The fill process typically allows the liquid level in the reactor to rise from 75% of capacity (at the end of the idle period) to 100%. When two tanks are used the fill process may last about 50% of the full cycle time. During the fill the reactor may be mixed only or mixed and aerated to promote biological reactions with the influent wastewater. React (aeration) During the react period the mechanical mixing and aeration units are on, the biomass consumes the substrate under controlled environmental conditions, as there is no additional volume and organic loadings into the tank as the rate of organic removal increases. Most of the carbonaceous BOD removal occurs in the react phase. Further nitrification occurs by allowing the mixing and aeration to continue. The majority of Denitrification takes place in the mixed-fill phase where mechanical mixers are active, but the aerators

11 remain off. Under anaerobic conditions the phosphorus released during mixed fill plus some additional phosphorus is taken up during the react phase. Settle (sedimentation/clarification) During this phase, no flow enters the basin and no aeration /mixing takes place. Activated sludge is allowed to separate from the liquid under quiescent conditions. The activated sludge tends to settle as a flocculent mass, forming a distinctive interface with the clear supernatant that can be discharged as sewage. Draw (decant) Clarified sewage (supernatant) is removed during the decent period. Many types of decanting mechanisms i.e. the decanter to initiate the opening of sewage discharge valve like the floating or adjustable weirs and fixed-arm decanters that can be used. The vertical distance from the decanter to the bottom of the tank should be maximized to avoid disturbing the settled biomass. Idle This step occurs between decant and the fill phases. An idle period is used in a multi tank system to provide time varies, based on the influent flow rate and the operating strategy form one reactor to complete fill phase before switching to another unit. Because idle is not a necessary phase, it is sometimes omitted. During this phase, a small amount of activated sludge at the bottom of the SBR basin is pumped out for a process called wasting. The practical aspects of selecting SBR over other treatment facilities: - 1. The areas where limited amount space is available for treatment, the treatment takes place in a single basin instead of multiple basins allowing for smaller footprint. 2. The treatment cycle can be adjusted to undergo aerobic, anaerobic and anoxic conditions in order to achieve biological nutrient removal, including nitrification, denitrification and some phosphorus removal. 3. Older wastewater treatment facilities can be retrofitted to an SBR because the basins are already present. 4. Wastewater discharge permits are becoming more stringent and SBR offers cost effective way to achieve lower sewage limits. DESIGN BASIS

12 The treatment plant is designed to treat the effluent of following characteristics. DESIGN BASIS: Flow : 200 m 3 / day (Considering 24 hrs operation) BOD : 250 COD : 400 TSS : 500 ph : The outlet parameters are as follows: BOD :<10 mg / lit COD :<50 mg / lit TSS :<20 mg / lit ph : ASSUMPTIONS/NOTES Effluent generation time considered same as sewage treatment time. No other parameter which exceeds the treated effluent limits as per KSPCB or which is hazardous in nature will present in the raw effluent. No TDS removal is envisaged. The oil and grease from the effluent are separated at the source (Kitchen). DESIGN CALCULATION Q max = 200 m 3 /day 1. Bar Screen: Flow: 200 cum/day Provide the metal bar of size 6 mm x 8 mm Bar Screen Chamber of size 0.5 m wide x 0.5 m depth. 2. Equalisation Tank OBJECTIVE: To equalize the flow and pollutant concentration. Generally, 4-6 hrs Hydraulic retention time is given for equalization tank. Provide one no. Equalization tank of 4 hrs hydraulic retention Q max = 200 m 3 /day

13 Average flow rate = 8.33 m 3 /hr Average BOD of sewage at the inlet of the Pre-aeration tank = 250 mg/lit. Total organic load with 20 % BOD reduction considered = 50 mg/lit. Total oxygen required assuming 2 Kgs of O2/kg of BOD Removed = 20 Kgs/day Air required for pre aeration = m 3 /hr Tank volume required = m3 Tank volume provided = 35 m 3 Size of the unit 4.0 m x 3.0 m x 3.0 m SWD 3. Raw Sewage Pump Volume of sewage = 200 m 3 / day = 8.33 m 3 /hr Discharge rate = 2.31 l/sec 4. Sequencing Batch Reactor Tank Objective: The SBR process utilizes fill and draw reactor with complete mixing during batch reaction step (after filling) and were as the subsequent steps of aeration and clarification occur in same tanks. Two tanks of same capacity will be provided. Flow (design) = 200 m 3 /day BOD in = 200 mg/l Aeration Tank Volume = Q x BOD F/M x MLSS = 200 m 3 /day x x 3500 Aeration Tank Volume = m 3 Aeration tank volume provided = 100 m 3 Assume SWD to be 3.0 m Therefore tank area required = 100/3.0 = m 2 Size of Aeration Tank Required = 6.0 m x 5.5 m x 3.0 m SWD Diffused Aeration System We have to design the aeration system for the maximum BOD i.e. 200 mg/l. Flow = 200 cum/day (8.33 cum/ hr) Inlet BOD = 200 mg/l (0.20 kg/cum) Organic load = BOD X Flow rate

14 1000 Total organic load in the system = 200 X 200/ 1000 = 40 Kgs/day Total oxygen required assuming that 2 Kgs of O2/kg of BOD Removed = 2 X 40 = 80 Kgs/day Air required = x 0.21 x 0.6 x 0.7 x 0.25 = cum/hr Since: Assume alpha =0.6 and β= 0.7 Consider oxygen transfer at 0.25 m depth = 25% Density of Air: 1.2 Kg/m3 Percentage of Oxygen in Atmospheric air Decanter Tank Average flow = 8.33 cum/hr Providing detention time = 6 hrs Volume of the tank required = m 3 Volume of the tank provided = 50 m 3 Providing SWD 3 m Final collection tank of size [4.5 m X 3.7 m X 3.0 m] Air required for pre-filtration tank = 50 x 0.5 = 25 m 3 /hr 6. Sludge Removal Pump Volume of Sludge : 6 m 3 /day. Discharge rate : m head. Type of pump : Horizontal centrifugal with CI open impeller self priming type coupled to motor of required speed with B Class insulation and IP 55 protection hood. Function : To pump the sludge from aeration tank to sludge holding tank.

15 7. Sludge Holding Tank Activated Sludge Quantity: Flow = 200 m 3 /day Assumptions: Total suspended solids = 600 mg/lt Hence mass of suspended solids present in 200 KL of Sewage would be: = 200 KLD x 600 mg/lt = 120 Kg/day Digester Volume: Assumptions: Min SRT: 10 days Specific gravity of the sludge: 1.03 Sludge concentration in the digester is 70 % of the incoming sludge concentration Reaction rate coefficient: 15deg C. Volatile fraction of digester TSS: 0.8 No primary solids are included. Volume of sludge to be disposed = x 1.03 x 0.03 = 3.88 cum/day Hence, Volume of the digester = 3.88 cum/day (0.7 x 0.06 x /10d) = cum Aerobic Sludge Digester volume provided = 30 cum Size of the sludge holding tank 3.5 m X 2.8 m X 3.0 SWD Air required for sludge holding tank = 30 x 0.5 = 15 m 3 /hr 8. Plate & Frame Filter Press. Assumed Type of Sludge : Secondary Biological Design Liquid Sludge Flow : 6000 Lts/Day Concentration of Solids : 1% Specific Gravity : 1.2 Minimum Dry Solids allowable in the sludge solid cake: 25-30%

16 Sludge Cake Characteristics: Cake Thickness : 32 mm Wet Cake Density : 1280 Kgs/m3 Operating Time 10 Hrs/Day : 6 Days /Week Cycle Time Feed : 20 Minutes Compression : 15 Minutes Cake Discharge : 25 Minutes Total : 60 Minutes Daily Sludge Solid Generation Rate : 6000 x 0.01 X 1.2 = 72 Kgs/Day Quantity of sludge solids load on filter press : 72 x 3 (Three days in a week operation) : 216 Kgs/for 3 days Assuming the sludge holding capacity as 40 Kgs/m 2 The size of Filter press required = 216/40 = 5.4 m 2 Let the size of each Plate be (0.61x 0.61 m) = 0.37 m2 Therefore the number of such chambers required will be = 5.4/0.37 = Nos Note: However provide 15 chambered filter press of size 0.61 m x 0.61 m with Collection tray, Filtrate line with Hydraulic/Power packed mechanism with screw pump and motor. 9. Filter feed pump 2 nos. (1 w + 1 sb) Pumping Rate : 8.33 m 3 /Hr Type of pump : Horizontal centrifugal with CI open impeller self priming type coupled to motor of required speed with B Class insulation and IP 55 protection hood. Function : To pump the clarified sewage through Pressure Sand and Carbon Filters. 10. Pressure sand & carbon filter Objective: To filter the suspended solids from the clarified water.

17 Flow rate = 200 / 16 = 12.5 cum/hr Type of filter = Dual grade sand filter (vertical type) Filtrations rate = 10 M/ Hr. Area of cross section of the Filter = 1.25 Sq. M Dia. of the DMF = 1.26 m Filter Dia. Provided = 1.3 m Activated carbon filter: Objective: To remove the odour and colour from the clarified water. Flow rate = 200 / 16 = 12.5 cum/hr Type of filter = Activated Carbon Filter (vertical type) Filtrations rate = 10 M/ Hr. Area of cross section of the Filter = 1.25 Sq. M Dia. of the ACF = 1.26 m Filter Dia. Provided = 1.3 m 11. Final treated water sump: Average flow = 200 cum/day = 8.33 cum/hr Providing detention time = 5 hrs Volume of the tank required = m 3 Volume of the tank provided = 45 m 3 Providing SWD 3.0 m Final collection tank of size [4.0 m X 3.8 m X 3.0 m] 12. Common Treated Water Transfer Pump Depending on the distance 13. Blower Capacity Blower capacity require: Equalization Tank + SBR Tank + Decanter Tank + Sludge Holding Tank = = m 3 /hr Note: The capacity of Common Twin Lobe Roots Air blower suitable to discharge about 200 m KSC 2 No.s (1 W + 1 SB). The common blower shall supply the air required for the SBR Tank and other primary, intermittent and final storage units of the treatment plant (Equalization Tank, Decanter Tank & Sludge holding Tank)

18 Calculation of diffuser required: Considering 6 m 3 /hour diffusion of air through the diffuser /m length Number of diffusers required = 200/6 = diffusers. Number of diffusers provided = 35 No s Type of aeration : Membrane Fine pore diffused aeration System Disinfection Unit Total flow = 200 m 3 /day Hypo dosage recommended = 5-10 mg/l Total hypo required = 10 x 200 = 2000 gms/day Commercial grade available = 5% = 5gm/100ml = 50 gm/l To dose 2000 gms per day we need about 40 L of 5% solution Dosing pump capacity required = 1.66 lph Dosing pump capacity provided = 1.66 lph Unit Details for 200 Kld STP Table 1.8: Civil works Description Equalization Tank SBR Tank Decanter Tank Sludge holding Tank Final Collection Tank Size 4.0 x 3.0 x 3.0 M 6.0 x 5.5 x 3.0 M 4.5 x 3.7 x 3.0 M 3.5 x 2.8 x 3.0 M 4.0 x 3.8 x 3.0 M Table 1.9: Electro Mechanical Equipments Description Size Bar Screen Plate & frame filter press Dual media filter 0.5 m x 0.5 m No. of plates : 15 size : 0.61 m x 0.61 m 1.3 m Dia x 1.8 HOS

19 FLOW DIAGRAM INLET BAR SCREEN CHAMBER COLLECTION TANK SEQUENTIAL BATCH REACTOR TANK PRESSURE SAND FILTER & ACTIVATED CARBON FILTER DECANTER TANK SLUDGE HOLDING TANK DISINFECTION FINAL COLLECTION TANK PLATE & FRAME FILTER PRESS FINAL DISPOSAL FOR TOILET FLUSHING, LANDSCAPING/ GARDENING & OTHER PURPOSES Traffic Control Measures Table 1.6 Car Parking Details S. Location of Car Park No. of Car Parks No. 1. Surface Parking 305 Total 305 Some of the traffic management measures proposed within the residential site is as follows. Footpath to be constructed by interlocking blocks & preferably barricaded for safety. Rubber humps at the exit gate drive way to reduce the speed. All gates will be manned with efficient security who can guide the entry and exit of vehicles. The entry/ exit to the site will be with adequate curvature at kerbs so that vehicles coming out/ entering the building do not impinge on road traffic.

20 Conclusion: By adopting the above management measures, the proposed project will not have significant negative impact on the environment.