NITROGEN REMOVAL BY DOWN-FLOW HANGING SPONGE REACTOR OPERATED AS A POST TREATMENT UNIT FOR UASB TREATING DOMESTIC SEWAGE
This study investigates the nitrification efficiency of Down-flow Hanging Sponge (DHS) reactor, which had been used as a post treatment unit for Upflow Anaerobic Sludge Blanket (UASB) reactor treating municipal sewage. During the total study period of 300 days, it was observed that NH4+-N removal efficiency of DHS was 62% and removal of total nitrogen was 56% at an HRT of 2.5 h. More importantly, it was also shown that DHS can accommodate a very high hydraulic loading rate of 78 m3/m2.d without any deterioration in its nitrification ability. Contribution of denitrification to nitrogen removal was 40% for which the retained biomass in the reactor was utilized as carbon source adding further merit to the process. The effect of temperature on the nitrification efficiency was also studied. The DHS reactor showed a quick recovery in nitrification as the temperature rose from winter to summer. At warmer temperature (>20oC) the NH4+−N removal efficiency averaged up to 84%. Better nitrification in DHS was possible due to the larger amount of retained biomass amounting up to 26 g-VSS/L of DHS sponge, which had higher rate of substrate utilization compared to other nitrifying sludge.
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: 2007-01-01
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 These proceedings are not peer reviewed.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