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

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EIA & RA STUDY FOR NAPHTHA SPLITTER PROJECT AT NUMALIGARH REFINERY LIMITEDBaseline Environmental StatusPLATE - 3.9MAP SHOWING LOCATION OF NOISE MONITORING STATIONSProjects & Development India Limited, Sindri Page 76 of <strong>80</strong>
EIA & RA STUDY FOR NAPHTHA SPLITTER PROJECT AT NUMALIGARH REFINERY LIMITEDBaseline Environmental Status3.10 SOLID & HAZARDOUS WASTESIn a broader sense, the solid wastes being generated from the refinery from varioussources can be classified as:a) Solid wastes generated in the process units and from other sources as a result ofmaintenance and operation activities, replacement of plant machinery etc., and otheractivities within the refinery premises.b) Solid wastes generated as a part of ETP operationsc) Solid wastes generated as a part of project activities.Solid and hazardous waste generated from processing plant and effluent treatment plantat Numaligarh Refinery Limited are as follows:• Oily Sludge• Chemical Sludge• Biological Sludge• Spent Catalyst• Tank bottom sludge• Miscellaneous wastes such as spent resins spent adsorbent, spent activated alumina,spent activated carbon and silica gel.3.10.1 Sludge GenerationThe different types of sludge generated at NRL may be summarized as under:Oily Sludge: The oily waste water is treated in API Separator and TPI Unit for recovery ofoil. After recovery of the oil, sludge is sent to the thickner and finally to the centrifuge fordewatering. The residue is stored in collection chamber.Chemical Sludge : Marginal quanity of chemical sludge is generated as sediments of sourwater tank and amine tank of SRU as oxidized amine residue. Chemical sludge resultsfrom caustic wash and Merox (Mercaptan Oxidation) treatment for removal of mercaptansand sulphides from lighter products of crude oil. Chemical sludge is also generated fromthe flocculation tanking during mixing of caustic treated effluent with ferric chloride andpolyelectrolytes. In raw water treatment plant, coagulation, flocculation, post-chlordinationalso contribute to chemical sludge generation.Projects & Development India Limited, Sindri Page 77 of <strong>80</strong>
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Chapter-III(59-80) - Pollution Control Board, Assam

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