Chapter-III(59-80) - Pollution Control Board, Assam

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EIA & RA STUDY FOR NAPHTHA SPLITTER PROJECT AT NUMALIGARH REFINERY LIMITEDBaseline Environmental Status3.8.6 Water Balance3.8.6.1 Source of WaterThe water requirement of NRL complex, Township, Numaligarh Marketing Terminal andCISF is met through the water intake well located near Dhansiri River. The intake well islocated in Lattakoojan village near Dhansiri River at a distance of about 2.5-kms fromrefinery. Water is discharged through pipeline of size about 24 inches and the total lengthof about 2.5-kms from Intake Well to raw water reservoire. Water is available in the regionthrough an extensive network of natural drainage/ river system leading towards Kaliani andDhansiri River, tributaries of Brahmaputra river catchement area.3.8.6.2 Water ConsumptionWater balance of Numaligarh Refinery may be summarized as under:Table - 3.43Details of Water BalanceSl. No. Description of Plants / Utilities m 3 /dayInput01 Total Raw Water Requirement 16,054Output02 Consumption in Fire Water System 3,98103 Consumption in RW Treatment Plant 12,08404 Treated Water Generated 11,78705 Effluent Loss 27106 Hume Pipe Loss 15Consumption of Treated Water07 DM Water Make up 5,01308 Service Water 1,66909 Drinking Water (Refinery) 38310 Drinking Water (NRL Township) 1,92211 Drinking Water (NRMT/CISF) 51512 Cooling Water Make-up 1,30813 Treated Water in Storage Tanks 977Total 11,7873.8.6.3 Wastewater GenerationThe total wastewater generation have been estimated as 2640 m 3 /day (110 m 3 /hr), whichincludes contaminated oily waste water, sanitary wastewater etc. The wastewatergenerated from different sources is segregated into Clean Stream of wastewater, OilyWastewater Stream (OWS) and Contaminated Rain Water Stream (CRWS). Clean StreamProjects & Development India Limited, Sindri Page 64 of 80
EIA & RA STUDY FOR NAPHTHA SPLITTER PROJECT AT NUMALIGARH REFINERY LIMITEDBaseline Environmental Statuscomprises desludging at raw water treatment plant, DM Plant, Boiler Blowdown, CoolingTower Blowdown etc. OWS comprises desalter effluent, stripped sour water, processsteam condensate, floor washings etc. CRWS comprises oily effluents including sanitarywastewater etc. Details of waste water generation may be summarized as under:Table-3.44Sl. No. Source m 3 /day01. Oily Water Stream (OWS) 121502. Contaminated Rain Water Stream (CRWS) 71303. DM Plant 42204. CT Blow Down 290Total Waste Water Generation 2640All these effluents are treated in existing Effluent Treatment Plant which has beendesigned to treat 5,280 m 3 /day 220 m 3 /hr.There is a Sewage Treatment Plant (STP) meant for purification of the domestic sewageoriginating from NRL factory and NRL township. The direct discharge of raw sewage intothe inland surface water causes depletion of DO content in the receiving water bodycausing destruction of aquatic flora and fauna. This plant is designed to treat 800 m 3 /dayand conforms to the requisite standards.Projects & Development India Limited, Sindri Page 65 of 80
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Chapter-III(59-80) - Pollution Control Board, Assam

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