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Changes in composition and microbial communities in excess sludge after heat-alkaline treatment and acclimation

Paper ID Volume ID Publish Year Pages File Format Full-Text
3884 197 2010 9 PDF Available
Title
Changes in composition and microbial communities in excess sludge after heat-alkaline treatment and acclimation
Abstract

This study examined the effects of combining heat-alkaline treatment (HAT) with an acclimation process on sludge reduction. Changes in sludge components and microbial communities in both the mixed liquor suspended solids (MLSS) and supernatant fractions were monitored throughout the process. HAT was performed under different pH conditions (pH 7, pH 11 and pH 13) at 60 °C. Approximately 42–62% of the released materials were proteins. After an 8-day acclimation of sludge, the protein concentration in the supernatant had significantly decreased under all conditions. Treatment conditions at pH 11 were optimal for sludge reduction due to the increased efficiency and reduced consumption of chemicals to adjust the pH. A molecular analysis showed that the microbial consortia in both fractions after the cell lysis differed depending on the pH and temperature, and only a few types of bacteria were resistant under extreme conditions. The microbial communities in the MLSS under different conditions were similar after the 8-day acclimation.

Keywords
MLSS; Total dissolved solids; Lysis-cryptic growth; Sludge reduction; DGGE
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Changes in composition and microbial communities in excess sludge after heat-alkaline treatment and acclimation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 52, Issues 2–3, 15 November 2010, Pages 151–159
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