OPTIMIZATION OF ACTIVATED SLUDGE DIFFUSION FOR HYDROGEN SULFIDE AND VOLATILE ORGANIC COMPOUNDS REMOVAL
A combination of design configurations (tall vs. short aeration tanks and coarse vs. fine air diffusion) was tested at pilot scale for optimum H2S removal by activated sludge diffusion (ASD).The effects of H2S diffusion on the wastewater treatment performance, in terms of biological oxygen demand(BOD), chemical oxygen demand (COD), suspended solids (SS) and ammonia (NH3) removal, were also evaluated, in eight four-week trials. The results showed that although all combinations of configurations gave 85 – 100% removal of up to 25 ppmv H2S, a combination of fine bubble diffusers in tal or short tanks gave the best results with regard to H2S removal (94 and 99%, respectively). This suggests that aeration tank height has no impact on H2S removal when using fine bubble diffusers. However, tank height was important in the configurations with coarse bubble diffusers, with 85% removal being obtained for a short tank and 99% for a tall tank configuration. The configuration with fine bubble diffusers in short tanks gave best treatment performance (75, 72 and 80% mean removal rates for BOD, COD and NH3, respectively, at the highest dosing period, compared with 72, 71 and 68% for the control). A brief suspension in nitrification was observed soon after commencement of ASD of H2S in the configuration with fine bubble diffusers in tall tanks and that with coarse bubble diffusers in short tanks. The configuration with fine bubble diffusers in short tanks also gave the best mixed liquor suspended solids (MLSS) maintenance and was therefore chosen for further studies to investigate removal of H2S peaks of up to 150 ppmv. These studies showed no effects of H2S diffusion on the wastewater treatment performance, when the plant was fully stabilized and the microbial biomass was well acclimated.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
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 These proceedings are not peer reviewed.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