TREATMENT OF PERSISTENT ORGANIC COMPOUNDS BY INTEGRATED CHEMICAL OXIDATION AND SBR ACTIVATED SLUDGE
The objective of this study was to evaluate the extent of improvement in the biodegradability persistent organic compounds by pre-oxidation by using Sequential Batch Reactors (SBRs). Dichlorodiethyl ether (DCDE), which is a non-biodegradable compound, was used as a test chemical. The oxidation processes applied in this study were ozonation, Fenton reagent and ultra-violet light coupled with hydrogen peroxide (UV/H2O2). The three processes were examined at DCDE oxidation levels of 50 to 100%. Chemically treated DCDE solutions were then subjected to SBR studies using activated sludge to determine the rate and extent of biodegradation of oxidation byproducts. Total organic carbon (TOC) and chemical oxygen demand (COD) were used to determine the removal efficiencies of the by-products. The concentration of DCDE was also measured for assessment of its removal during the integrated process. The results indicated that the biodegradability of pre-oxidized DCDE increased drastically compared to non-oxidized solutions, reaching an average of 90% for all three oxidation methods versus zero for non-oxidized DCDE. It was concluded that the results of SBR experiments may be better indicators of biodegradability of chemically-oxidized wastewaters due to significant acclimation of microorganisms in SBRs, which cannot be observed in conventional respirometric laboratory studies.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
Document Type: Research Article
Publication date: 2004-01-01
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 These proceedings are not peer reviewed.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