Mobilization of Arsenic and Manganese In the Soil-aquifer System Due to Wastewater Percolation - A Manageable Problem?
The Fresno-Clovis Regional Water Reclamation Facilities discharge effluent to percolation ponds. Arsenic and manganese have been detected at concentrations greater than their MCLs in the downgradient groundwater. Core sampling and wet/dry pond cycling studies were conducted to better understand the processes that lead to these conditions, and to investigate strategies to decrease concentrations of arsenic and manganese in the groundwater. Core sampling studies showed the presence of alluvial arsenic and manganese. Modest decreases in arsenic concentrations were observed in the groundwater after a half-year of pond cycling, but no changes were observed in manganese concentrations. Low groundwater concentrations of metals were correlated with high concentrations of nitrate, and vice versa. These results support the hypothesis that reducing conditions caused by the effluent are responsible for mobilizing alluvial arsenic and manganese. However, when the groundwater migrates offsite and is reoxidized, the metals are removed from the plume.
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: 2009-01-01
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 These proceedings are not peer reviewed.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