Tests were conducted to determine the feasibility for using nitrification and denitrification to control electrical conductivity in an industrial wastewater treatment process effluent. A laboratory-scale sequencing-batch reactor (SBR) system provided 98.5% COD removal and 99.5% nitrification when operating at a solids retention time of 12 days. The resulting average effluent COD concentration was 20 mg/L. Complete nitrification occurred within six hours of aeration but twelve hours of reaction time was required for denitrification. The nitrate-N concentration in the decanted SBR effluent averaged 21 mg/L. Completion of denitrification in downstream denitrification filters will reduce the EC from 1,210 to 852 μS/cm, thereby allowing the plant to meet its EC discharge standard.
A sequencing batch reactor (SBR) activated sludge system was designed to upgrade an industrial wastewater treatment facility serving multiple industries at Tulare, California. The purpose of the upgrade was to provide capacity to meet more stringent effluent quality criteria for discharge/reuse and to provide expansion from 26,000 m 3 /d (7 MGD) to a total of 45,000 m 3 /d (12 MGD). Particular emphasis was placed on meeting an electrical conductivity (EC) discharge limit of 500 uS/cm above background groundwater conditions. The design approach sought to make optimum use of existing processes and included continued use of an existing low rate anaerobic reactor and existing aerated lagoons for pretreatment prior to additional COD removal and nitrification and denitrification in the SBR process. The system currently (2009) is under construction with completion scheduled for late 2009.
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