bids are invited for repair, maintenance, and installation of plant/ systems/equipments (version 2) - industry unit; non- comprehensive operation and maintenance of membrane bio-rector (mbr) in stp-2 plant rcf, trombay unit for a period of two years; as per sow design bioreactor temperature 0c 22-32 2 ph nu 6.6-7.2 3 chemical oxygen demand (cod) mg/l 450 4 biological oxygen demand-5 days (bod5) mg/l 350 5 total suspended solids mg/l 300 6 tkn-n mg/l 45-50 7 ammonical nitrogen as n mg/l 30-35 8 nitrate nitrogen mg/l < 20 9 tkn mg/l 45-50 10 total phosphorous as p mg/l 7-12 11 phosphate mg/l 11-25 12 total alkalinity as caco3 mg/l 300-350 13 tds mg/l 650 14 iron mg/l 0.2-0.6 15 total hard