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Title: Anaerobic treatment of wastewater using a two-stage packed-bed reactor containing polyvinyl alcohol gel beads as biofilm carrier
Authors: Pandey S.
Sarkar, Sudipta
Published in: Journal of Environmental Chemical Engineering
Abstract: Anaerobic treatment of wastewater is a viable alternative to aerobic treatment with the advantage of low net energy requirement and less sludge production. Successful establishment of a two-stage anaerobic treatment process resulted in better performance and improved tolerance to perturbations in operating conditions such as high organic loading rate and higher methane production. In this study we have reported process development, microbial enrichment and validation of performance of a two-stage anaerobic packed-bed reactor comprising of an acidogenic reactor followed by a methanogenic reactor, each containing porous polyvinyl alcohol (PVA)-gel beads as biofilm carrier, harboring different consortia of microorganisms for treating wastewater at mesophilic temperature. The stage-separated reactor system demonstrated chemical oxygen demand (COD) removal efficiency up to 89% with overall methane productivity of 0.08 L methane/(L reactor.d). During steady-state operation, the acidogenic reactor produced an effluent with concentration ratio of propionic acid to acetic acid as low as 0.2, which indicated the stability of the reactor system against environmental shock-related failure. During an event of deliberately imposed low-temperature shock period of 60 days, the COD removal efficiency decreased from 89% at steady-state to as low as 33% with concomitant decline in methanogenic productivity. The predominance in microbial community changed from steady-state characteristics of Gram positive to Gram negative during the temperature shock. After the shock was withdrawn, the reactor system regained its original performance within 28 days; the Gram positive bacteria also switched back to the predominance. ¬© 2017 Elsevier Ltd. All rights reserved.
Citation: Journal of Environmental Chemical Engineering(2017), 5(2): 1575-1585
Issue Date: 2017
Publisher: Elsevier Ltd
Keywords: Anaerobic packed bed reactor
Anaerobic wastewater treatment
PVA gel beads
Temperature shock
ISSN: 22133437
Author Scopus IDs: 57149849600
Author Affiliations: Pandey, S., Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India
Sarkar, S., Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India
Corresponding Author: Sarkar, S.; Department of Civil Engineering, Indian Institute of Technology RoorkeeIndia; email:
Appears in Collections:Journal Publications [CE]

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