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Excess sludge reduction induced by Tubifex tubifex in a recycled sludge reactor

Paper ID Volume ID Publish Year Pages File Format Full-Text
25484 43576 2007 9 PDF Available
Title
Excess sludge reduction induced by Tubifex tubifex in a recycled sludge reactor
Abstract

Sludge reduction in a conventional activated sludge (CAS) process combined with a recycled sludge reactor where Tubifex tubifex (one of Oligochaeta) was inoculated was investigated in this study. The results showed sludge production could be reduced through T. tubifex's predation on sludge in the recycled sludge reactor. The sludge reduction rate of T. tubifex (R) was from 0.18 to 0.81 mg-VSS mg-Tubifex−1 d−1. The sludge reduction capacity of the recycled sludge reactor E was from 650 to 1080 mg-VSS L−1 d−1. The optimum density of T. tubifex was 2500 mg L−1 and the optimum sludge recycled ratio was 1. The existence of T. tubifex did not affect COD and NH4+-N removals in the process, but led to a slight decrease in TP removal. SVI almost did not change when the T. tubifex density was lower than 3300 mg L−1. The LC50 values on T. tubifex of copper and ammonia were 2.5 and 880 mg L−1, respectively, both of which were higher than those on Aeolosoma hemprichi.

Keywords
T. tubifex; Predation; Sludge reduction; Wastewater treatment
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Excess sludge reduction induced by Tubifex tubifex in a recycled sludge reactor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Biotechnology - Volume 127, Issue 3, 10 January 2007, Pages 443–451
Authors
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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