ALTERNATIVES FOR TREATING HIGH NITROGEN LIQUOR FROM ADVANCED ANAEROBIC DIGESTION AT THE BLUE PLAINS AWTP
Abstract:The Blue Plains Advanced Wastewater Treatment Plant (AWTP) uses a two-stage activated sludge system, including methanol-driven nitrification/denitrification (NDN) in the second-stage to meet stringent effluent limits, including a total nitrogen (TN) objective of 7.5 mgN/L. In the near future, the plant will be undergoing construction of an advanced anaerobic digestion system with biosolids dewatering. It has been estimate that the dewatering centrate will increase the (TN) load by approximately 40% on the NDN plant. One of the most significant effects will be the substantial increase in methanol chemical costs as the plant currently spends between $7-8 M annually on this chemical alone. This paper presents a review of alternative strategies to mitigate the impact of the centrate. Two alternative were short-listed for a more detailed review; (1) the SHARON process, and (2) a new process configuration conceived by the authors which has tentatively been named the MAUREEN process. The detailed review included process modeling to determine the relative benefits of these alternatives, including reductions in methanol dosage and process aeration requirements. The capital cost of installing the SHARON and MAUREEN processes were estimated to be $14.6M and $21.3M, respectively. However, total annual methanol and aeration savings were estimated to be $2.8M greater for MAUREEN compared to SHARON. The analysis indicates that both the SHARON and MAUREEN processes should be considered viable alternatives to mitigate the impact of centrate at the Blue Plains AWTP.
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 These proceedings are not peer reviewed.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