fulltext.study @t Gmail

Excess sludge reduction in activated sludge process through predation of Aeolosoma hemprichi

Paper ID Volume ID Publish Year Pages File Format Full-Text
4826 249 2006 6 PDF Available
Title
Excess sludge reduction in activated sludge process through predation of Aeolosoma hemprichi
Abstract

In this study, sludge reduction in a conventional activated sludge (CAS) process where Aeolosoma hemprichi (one species of oligochaeta) was inoculated as a micro-fauna was tested. The factors affecting the growth of A. hemprichi and the influence of A. hemprichi on treatment performance were investigated. The observed specific growth rate of A. hemprichi decreased at lower SRT, and the SRT at which A. hemprichi would be totally exhausted was estimated about 3 days. Obvious appearance of A. hemprichi was observed when the F/M ratio was lower than 0.7 mg-COD/(mg-VSS day). A. hemprichi grew independent of sludge concentration when SS concentration was higher than 300 mg-VSS/L, and more easily predated on sludge floes with higher protein content or smaller particle size. The apparent sludge yield was found to have a negative correlation with the density of A. hemprichi in the CAS reactor. The relative sludge reduction by A. hemprichi was estimated to be about 39–65%, and the apparent sludge reduction rate per unite weight of A. hemprichi was from 0.53 to 6.32 mg-VSS/(mg-A. hemprichi day). The existence of A. hemprichi was beneficial to stabilize the sludge settleability and TP removal but did not affect COD and NH4+-N removals in the process. The results indicated that using A. hemprichi to reduce sludge in wastewater treatment was feasible.

Keywords
Aeolosoma hemprichi; Predation; Sludge reduction; Wastewater treatment
First Page Preview
Excess sludge reduction in activated sludge process through predation of Aeolosoma hemprichi
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 28, Issue 2, 15 February 2006, Pages 117–122
Authors
, , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us