PERFORMANCE EVALUATION OF A PILOT-SCALE PN/CD SYSTEM TREATING HIGH AMMONIA CONCENTRATION INDUSTRIAL WASTEWATER
Abstract:Jun-Dar union wastewater treatment plant in Kaushung Taiwan provides wastewater treatment service for several petrochemical plants in Jun-Dar industrial park. The influent BOD5/COD ratio of this wastewater treatment plant averaged below 0.2 because wastewater has been treated biologically before discharged to the union wastewater treatment plant. The wastewater also contains high ammonia concentration and is low in COD/N ratio (close to 1.0). Existing treatment process is powder activated carbon technology process with wet air oxidation for activated carbon re-generation (PACT-WAR). So far, the treated wastewater can meet Taiwan EPA effluent discharge standard, but higher O & M cost pushes the treatment plant administration seeking more cost effective way to treat the wastewater.
A pilot scale partial nitrification / complete denitrification (PN/CD) system was established on site to test its availability to treat the wastewater. Granular activated carbon was used as the media for attached biofilm. The packing ratio of both nitrification and denitrification tanks are 20% in volume. Two hydraulic retention times were tested in this study. Test results showed that PN/CD process can avoid over nitrification by controlling the flow rate to the nitrification tank. In this study, effluent pH and nitrate nitrogen concentration are better controlled than the existing PACT process. The averaged effluent COD concentration 112 mg/L under 4 hours HRT in denitrification tank and 8 hours HRT in nitrification tank. In order to meet discharge standard of effluent COD (<100 mg/L), a longer HRT is needed. Lack of alkalinity in wastewater and DO supply limitation are two drawbacks to apply PN/CD system in Jun-Dar wastewater treatment plant. Adding external alkalinity in nitrification tank is necessary for better control of nitrification.
Document Type: Research Article
Publication date: 2005-01-01
More about this publication?
- Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.
WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
- Subscribe to this Title
- Membership Information
- About WEF Proceedings
- WEFTEC Conference Information
- Learn about the many other WEF member benefits and join today
- Ingenta Connect is not responsible for the content or availability of external websites