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

EIA & RA STUDY FOR NAPHTHA SPLITTER PROJECT AT NUMALIGARH REFINERY LIMITEDBaseline Environmental Status3.10.3 Miscellaneous WastesMiscellaneous wastes include spent resins from DM Plant, spent absorbent from hydrogenunit, spent activated carbon, silica gels and sludge from treatment plants and storagetanks.Table-3.51QUANTITY OF SLUDGE/ SOLID WASTE GENERATEDWastes : Quantity (MTPA)Oily & Chemical Sludge : 100-120Tank Bottom Sludge : 20-30Spent Catalyst : 50-603.10.4 Existing Solid Waste Storage and Disposal FacilitiesOily sludge is initially collected in collection chamber. The sludge so collected is thenshifted in closed drums to secured landfill area for its disposal. The bio-sludge is stored insealed drums. A part of the bio-sludge is used in gardens and the remaining sludge isdisposed of in secured landfill area. The spent catalysts are also collected and stored insealed drums. Periodically the catalysts are sold to the CPCB authorized recyclers. Thespent resins are stored in solid waste stock yard.A storage and disposal facility for non-hazardous waste is available at NRL. All the nonhazardouswastes such as spent resin, paper, bags, electrical waste, PVC piping, hoses,rags etc are stored in solid waste disposal yard till its final disposal.3.11 ECOLOGYIn view of the ecological sensitivity of the project region and the need for conservation ofenvironmental quality and bio-diversity of the area, the study of biological environmentbecomes one of the most important aspects for Environmental Impact Assessment (EIA)study. Generally, biological communities are the good indicators of climatic and edaphicfactors. Studies on biological aspects of ecosystems are important in EIA study for safetyof natural flora and fauna. Information on the impact of environmental stress on thecommunity structure serves as an inexpensive and efficient early warning system to checkthe damage to a particular ecosystem. The biological environment includes mainlyterrestrial ecosystem and aquatic ecosystem.Projects & Development India Limited, Sindri Page 79 of 80