Phosphorus partitioning in Co-dewatering biosolids and water treatment residuals

Malcolm Taylor, Herschel Adams Elliott

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Stabilization and dewatering methods for wastewater solids determine the concentration and nature of phosphorus (P) in biosolids and in-plant sidestreams recycled to the liquid treatment facility. Because water treatment residuals (WTR) exhibit strong immobilization of soluble P, this study evaluated the impact of co-dewatering WTR and biosolids on the P partitioning during dewatering and the environmental lability of biosolids-P measured by water extractable P (WEP). Overall, P progressively partitioned into the water-insoluble particulate-bound form in dewatered cake with increasing blending ratio (BR)-defined as the dry mass ratio of WTR-to-biosolids. The reject water total P (TP) content from dewatering biosolids alone (250 mg L-1) was reduced to 60 mg L-1 for a BR=1.5. Polymer addition resulted in statistically (α=0.05) lower reject liquid TP, suggesting the cationic polyelectrolyte contributed to P binding. The WEP of the dewatered cake (~20% solids) dropped from 2.36 g kg-1 (biosolids only) to ~0.14 g kg-1 for BR = 1.5, meaning the P in land-applied co-processed cake is less susceptible to solubilization by surface runoff compared to unamended biosolids. Co-dewatering can reduce P in return flows and fix P in the dewatered solids in a form less prone to off-site migration following land application.

Original languageEnglish (US)
Title of host publication87th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2014
PublisherWater Environment Federation
Pages1281-1293
Number of pages13
ISBN (Electronic)9781510870451
StatePublished - Oct 1 2014
Event87th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2014 - New Orleans, United States
Duration: Sep 27 2014Oct 1 2014

Publication series

Name87th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2014
Volume1

Conference

Conference87th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2014
CountryUnited States
CityNew Orleans
Period9/27/1410/1/14

All Science Journal Classification (ASJC) codes

  • Ecological Modeling
  • Environmental Chemistry
  • Pollution
  • Waste Management and Disposal
  • Water Science and Technology

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  • Cite this

    Taylor, M., & Elliott, H. A. (2014). Phosphorus partitioning in Co-dewatering biosolids and water treatment residuals. In 87th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2014 (pp. 1281-1293). (87th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2014; Vol. 1). Water Environment Federation.