Environmental Management of Biosolids and Water Treatment Residuals
As landfill space becomes less available, many municipalities will have to look towards alternative methods of waste disposal. Wastewater biosolids have been extensively studied and proven as a recyclable material. Water treatment plant residuals (WTR), on the other hand, have been but briefly studied. The Colorado Department of Public Health and Environment has established guidelines regarding land co-application of WTR and biosolids since the WTR is postulated to greatly reduce plant P availability and possibly provide an additional source of trace metals to soil. If co-application ratios can be established so as to not tie up P and limit its plant uptake, co-application will be an environmentally safe method of recycling. In a laboratory study, we investigated the biosolids-borne P adsorption capacity of an alum-containing WTR from two Colorado municipalities. Our adsorption study indicated that co-mixing of both municipalities' WTR and biosolids at ratios of 8:1 will adsorb most soluble biosolids P. Beyond this ratio the WTR could adsorb all biosolids available P and possibly some soil-borne P. In a greenhouse study we co-applied various ratios of WTR and biosolids to soil growing either blue grama (Bouteloua gracilis H.B.K. Lag) or western wheatgrass (Pascopyrum smithii (Rydb.) A. Love). A positive linear relationship was evident between increasing WTR rate and blue grama yield, and a negative linear relationship between increasing WTR rate and shoot phosphorus and aluminum concentration. We observed a negative quadratic relationship with increasing WTR rate and western wheatgrass shoot aluminum concentration. Some investigators have observed plant P deficiency symptoms associated with WTR application; however, we did not.
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: 2001-01-01
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 These proceedings are not peer reviewed.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