WAS Fermentation: New Kid in the EBPR Block

Description:The reliability of Enhanced Biological Phosphorous Removal (EBPR) process and the rate and the stability of the denitrification process are improved by the availability of an easily biodegradable carbon source, commonly represented by volatile fatty acids (VFA). Primary sludge (PS) fermentation to produce VFA has been a common practice where VFA supplementation from an external source is required. In addition to providing an economical source of VFA, PS fermentation also provided sludge thickening as an additional benefit. Previously, waste Activated Sludge (WAS) fermentation was not considered beneficial to produce VFA due to the phosphorous and ammonia release from the biomass during fermentation. However, WAS fermentation is emerging as a new technology due to its many potential benefits such as cost-effective reduction of mass of WAS for digestion and the use of WAS fermenter supernatant as a source of VFA for the EBPR process. Other potential benefits of WAS fermentation include facilitation of side-stream phosphorous recovery and significant enhancement of dewaterability of digested sludge. This paper describes the current understanding of this emerging technology. A comparison will be made between the WAS and PS fermentation with respect to design parameters, operational parameters, pilot and full-scale experiences. Possible WAS fermentation configurations and the demonstrated benefits of WAS fermentation will be discussed.

Authors: Lalith Liyanage

Subjects:

Tags:Enhanced Biological Phosphorous Removal (EBPR),AC14,2014 Annual Conference,Waste Activated Sludge Fermentation,AC2014

Citation:Stream G. 8.1.

Publication Date:May 6th, 2014 Upload Date:Jun 30th, 2014

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