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Biosorption for carbon capture on acclimated sludge—Process kinetics and microbial community

Paper ID Volume ID Publish Year Pages File Format Full-Text
2681 126 2016 11 PDF Available
Title
Biosorption for carbon capture on acclimated sludge—Process kinetics and microbial community
Abstract

•Predominant mechanism(s) involved in biosorption was investigated.•Biosorption capacity was 250 mg COD/g SS under loadings 0.5–2.5 g COD/g SS.•Carbon storage was the predominant mechanism in the first 20–30 min of biosorption.•Chemisorption and intraparticle diffusion were likely the rate-limiting steps.•Taxa capable of carbon-storage were uniquely detected in the acclimated sludge.

This study investigated the biosorption process kinetics and the associated microbial community. Seed sludge from the aeration tank of a wastewater treatment plant in Singapore was acclimated with synthetic wastewater formulated to contain colloidal (ca. 40%) and dissolved COD (Chemical Oxygen Demand). The COD removal kinetics and the individual mechanisms involved were determined by subjecting the acclimated sludge to increasing organic loadings (0.1, 0.5, 1.0, and 2.5 g COD per g suspended solid) of synthetic wastewater. Under pH 7, sorption capacity of the acclimated sludge increased with organic loading. Comparison between live and azide-inactivated sludge revealed that under organic loading of 1.0 g COD/g SS, a level similar to a typical contact tank for carbon capture, at least 74% of the biosorption capacity was contributed by carbon storage. Kinetics data suggested that carbon storage was the predominant mechanism in the first 20–30 min of the carbon capture biosorption process. The removal kinetics of dissolved COD can be represented by a pseudo-second-order model and intraparticle diffusion model. These suggested the rate-limiting steps could include chemisorption and intraparticle diffusion. On the other hand, colloid COD removal can be described as a first order process with respect to initial organic loading. Taxa capable of carbon-storage which include Chloroflexi, Thiobacillus sp., Xanthobacter sp., Mycobacterium sp., and Nakamurella sp., were uniquely detected in the acclimated sludge.

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Keywords
Activated sludge; Biosorption; Biosorption kinetics; Carbon capture; Carbon storage; Energy recovery
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Biosorption for carbon capture on acclimated sludge—Process kinetics and microbial community
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 114, 15 October 2016, Pages 119–129
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