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Energies 2015, 8(8), 7968-7985; doi:10.3390/en8087968

Release of Extracellular Polymeric Substance and Disintegration of Anaerobic Granular Sludge under Reduced Sulfur Compounds-Rich Conditions

1
Center for Material Cycles and Waste Management Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
2
School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan road, Minghang district, Shanghai 200240, China
3
Research and Development Center, Sumitomo Heavy Industries Environment Co., Ltd., Yokosuka, Kanagawa 237-8555, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Thomas E. Amidon
Received: 24 June 2015 / Revised: 23 July 2015 / Accepted: 24 July 2015 / Published: 31 July 2015
(This article belongs to the Collection Bioenergy and Biofuel)
View Full-Text   |   Download PDF [331 KB, uploaded 5 August 2015]   |  

Abstract

The effect of reduced form of sulfur compounds on granular sludge was investigated. Significant release of extracellular polymeric substance (EPS) from the granular sludge occurred in the presence of sulfide and methanethiol according to various concentrations. Granular sludge also showed a rapid increase in turbidity and decrease in diameter in accordance with sulfide concentration during the long-term shaking, suggesting that the strength of the granules was reduced with high-concentration sulfide. A continuous experiment of up-flow anaerobic sludge blanket reactors with different concentrations of sulfide (10, 200, 500 mg-S/L) influence demonstrated that the reactor fed with higher concentration of sulfide allowed more washout of small particle-suspended solid (SS) content and soluble carbohydrate and protein, which were considered as EPS released from biofilm. Finally, the presence of sulfide negatively affected methane production, chemical oxygen demand removal and sludge retention in operational performance. View Full-Text
Keywords: granular sludge; reduced sulfur compounds; extracellular polymeric substance (EPS) granular sludge; reduced sulfur compounds; extracellular polymeric substance (EPS)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kobayashi, T.; Xu, K.-Q.; Chiku, H. Release of Extracellular Polymeric Substance and Disintegration of Anaerobic Granular Sludge under Reduced Sulfur Compounds-Rich Conditions. Energies 2015, 8, 7968-7985.

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