Salient features of Chennai City • Chennai, the capital of Tamil Nadu, is the fourth largest city in India • The growth of the City started in 17th Century. • Organized water supply commenced in 1872 & protected water supply in 1914 Chennai City
Expanded Chennai City METROWATER Map showing Expanded Chennai City Fifteen Zones & Divisions • Old Chennai Corporation : 176 Sqkm • Municipalities : 9 • Town Panchayats : 8 • Village Panchayats : 25 • Expanded Chennai Corporation : 426 sqkm • Population : 6.8 million
Chennai City Sewerage System • Comprehensive zonal sewerage system implemented in the year 1961 • City divided into 5 zones • Sewage Pumping Stations : 255 Nos
REUSE OF SECONDARY TREATED SEWAGE • From Kodungaiyur STP, the secondary treated effluent is being supplied to the following Industries at the rate of Rs.18.40 per kilo litre M/s Chennai Petroleum Corporation Ltd (CPCL) : 18.00 MLD M/s Madras Fertilizer Ltd (MFL) : 10.50 MLD M/s Manali Petro Chemicals (MPL) : 1.50 MLD Total : 30.00 MLD • Revenue of about Rs.16 crore is being generated per year through the sale of secondary treated effluent to the industries. • About 3.00 lakhlitres per day of secondary treated effluent is supplied to the Chennai Municipal Corporation for watering of plants and lawns at public parks and traffic islands, at free of cost. • The 0.5 MLD of secondary treated effluent supplied from Koyambedu STP to M/s. CMRL at the rate of Rs.18.40/KL
REUSE OF SECONDARY TREATED SEWAGE • The treated effluent for gardening purpose is being supplied from CMWSSB’s Perungudi Sewage Treatment Plant to TNRDC and PWD. • An amount of Rs.100/- for 12 KL and Rs.200/- for 24 KL is being collected by CMWSSB towards supply of treated effluent. • TNRDC is using the treated effluent for gardening the plant in the center meridian along OMR road, whereas PWD is utilizing the treated effluent for gardening purpose in Gandhi Mandapam. • At Perungudi approximately 8 trips of 24 KL treated effluent are supplied per day.
WATERDEMANDASSESSMENT IndustrialPark 2014-15 2019-20 2029-30 EXISTING MLD MLD MLD Irungattukottai 12.00 12.61 13.24 Sriperumbudur 7.51 11.55 12.42 Oragadam 9.48 12.98 13.63 Pillaipakkam 3.10 5.55 5.96 UPCOMING Vallam-Vadakal 1.41 8.46 9.40 Vaipur-Mathur 0.49 2.91 3.23 TotalDemand 33.9954.0657.88 %ofTTROWater 80% 80% 80% TTROwater requirement 27.19 43.25 46.30 Enrouteindustries (alongNH-4) 2.50 2.75 13.03 TotalDemand of 29.69 46.00 59.33 TTROwater
FUNDING PATTERN • The Government of Tamil Nadu has accorded Administrative Sanction at a cost of Rs.394.00 crores as per G.O.(Ms) No.147, dt. 01.12.2014 for this project under AMRUT/TNIPP-I Funds which is as follows. • AMRUT (GOI) @ 33% - Rs 130.02 cr • GOTN @ 20% - Rs 78.80 cr • TNIPP -I - Rs 231.50 cr An amount of Rs.231.50 crores have been sanctioned for transmission line under TNIPP-I Fund.
PROCESSFLOW SCHEME From Existing STP EQUALIZATION TANK (1 NO.,TWIN COMP Inlet flow: 63.40 MLD RAPID GRAVITY FILTERS (Total flow): 63.40 MLD 6 NOS (5W+1S) BASKET STRAINERS 4 NOS (3W+1S) FILTERED WATER STORAGE TANK (1 NO.) ULTRAFILTRATION SKIDS 7 NOS (6W+1S) Inflow: 62.928 MLD Outflow: 56.25 MLD UF CEB TO DB TANK FeCl3 and HCL Dosing 0.264 MLD UF CIP SYSTEM ClO2 Dosing Sodium Hypo Chlorite Dosing UF PERMEATE TANK (1 NO.) From Chlorine Dioxide Generator Backwash F low: 6.672 MLD BACKWASH TANK Air Scouring blower UF BW DOSING OF SMBS ,CAUSTIC AND ANTISCLANAT MICRON CARTRIDGE FILTERS 4 NOS (3W+1S) Inflow: 56.25 MLD From UF B/W AND CEB WASTE 6.269 MLD RO CIP SYSTEM RGF B/W WASTE = 0.876 MlD DISPOSAL BLENDING TANK REVERSE OSMOSIS SKIDS 4 NOS (3W+1S) Inflow: 56.25 MLD outflow: 45.00 M LD Reject: 11.25 MLD ClO2 Dosing Acid Dosing RO REJECT CausticDosing Cooum Canal Product water to M/s SIPCOT through M.S. Transmission pipeline TREATED WATER STORAGE TANK 45 MLD DEGASSER TOWER
TRANSMISSION ROUTE FOR CONVEYING PRODUCT WATER
The estimated quantity of TTRO water • required for various SIPCOT Industrial • hubs are as follows : • At Irungattukottai : 09.70 MLD • At Sriperumbudur : 13.30 MLD • At Oragadam : 22.00 MLD • Estimated quantity : 45.00 MLD BENEFICIARIES OF TTRO WATER
FINANCIAL IMPACT ON SUPPLY OF TTRO WATER • Project cost for Koyambedu = Rs 486.21 crores • Proposed rate of supply = Rs 120 / kl • Pay back period = 3 years (approx)
To ensure continuous water supply to industries • Reduction in fresh water demand by the industries. • To increase the rate of supply of domestic consumption • To generate the revenue for CMWSSB. OVERALL BENEFITS ON REUSE OF WASTE WATER