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Optimization of operation conditions for preventing sludge bulking and enhancing the stability of aerobic granular sludge in sequencing batch reactors.
Water Sci Technol. 2014; 70(9):1519-25.WS

Abstract

Sludge bulking caused by loss of stability is a major problem in aerobic granular sludge systems. This study investigated the feasibility of preventing sludge bulking and enhancing the stability of aerobic granular sludge in a sequencing batch reactor by optimizing operation conditions. Five operation parameters have been studied with the aim to understand their impact on sludge bulking. Increasing dissolved oxygen (DO) by raising aeration rates contributed to granule stability due to the competition advantage of non-filamentous bacteria and permeation of oxygen at high DO concentration. The ratio of polysaccharides to proteins was observed to increase as the hydraulic shear force increased. When provided with high/low organic loading rate (OLR) alternately, large and fluffy granules disintegrated, while denser round-shape granules formed. An increase of biomass concentration followed a decrease at the beginning, and stability of granules was improved. This indicated that aerobic granular sludge had the resistance of OLR. Synthetic wastewater combined highly and slowly biodegradable substrates, creating a high gradient, which inhibited the growth of filamentous bacteria and prevented granular sludge bulking. A lower chemical oxygen demand/N favored the hydrophobicity of granular sludge, which promoted with granule stability because of the lower diffusion rate of ammonia. The influence of temperature indicated a relatively low temperature was more suitable.

Authors+Show Affiliations

School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: kaiyangchn@126.com.School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: kaiyangchn@126.com.School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail: kaiyangchn@126.com.State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.School of Environment & Urban Construction, Wuhan Textile University, Wuhan 430073, China.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25401316

Citation

Zhou, Jun, et al. "Optimization of Operation Conditions for Preventing Sludge Bulking and Enhancing the Stability of Aerobic Granular Sludge in Sequencing Batch Reactors." Water Science and Technology : a Journal of the International Association On Water Pollution Research, vol. 70, no. 9, 2014, pp. 1519-25.
Zhou J, Wang H, Yang K, et al. Optimization of operation conditions for preventing sludge bulking and enhancing the stability of aerobic granular sludge in sequencing batch reactors. Water Sci Technol. 2014;70(9):1519-25.
Zhou, J., Wang, H., Yang, K., Ma, F., & Lv, B. (2014). Optimization of operation conditions for preventing sludge bulking and enhancing the stability of aerobic granular sludge in sequencing batch reactors. Water Science and Technology : a Journal of the International Association On Water Pollution Research, 70(9), 1519-25. https://doi.org/10.2166/wst.2014.406
Zhou J, et al. Optimization of Operation Conditions for Preventing Sludge Bulking and Enhancing the Stability of Aerobic Granular Sludge in Sequencing Batch Reactors. Water Sci Technol. 2014;70(9):1519-25. PubMed PMID: 25401316.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Optimization of operation conditions for preventing sludge bulking and enhancing the stability of aerobic granular sludge in sequencing batch reactors. AU - Zhou,Jun, AU - Wang,Hongyu, AU - Yang,Kai, AU - Ma,Fang, AU - Lv,Bin, PY - 2014/11/18/entrez PY - 2014/11/18/pubmed PY - 2015/5/9/medline SP - 1519 EP - 25 JF - Water science and technology : a journal of the International Association on Water Pollution Research JO - Water Sci. Technol. VL - 70 IS - 9 N2 - Sludge bulking caused by loss of stability is a major problem in aerobic granular sludge systems. This study investigated the feasibility of preventing sludge bulking and enhancing the stability of aerobic granular sludge in a sequencing batch reactor by optimizing operation conditions. Five operation parameters have been studied with the aim to understand their impact on sludge bulking. Increasing dissolved oxygen (DO) by raising aeration rates contributed to granule stability due to the competition advantage of non-filamentous bacteria and permeation of oxygen at high DO concentration. The ratio of polysaccharides to proteins was observed to increase as the hydraulic shear force increased. When provided with high/low organic loading rate (OLR) alternately, large and fluffy granules disintegrated, while denser round-shape granules formed. An increase of biomass concentration followed a decrease at the beginning, and stability of granules was improved. This indicated that aerobic granular sludge had the resistance of OLR. Synthetic wastewater combined highly and slowly biodegradable substrates, creating a high gradient, which inhibited the growth of filamentous bacteria and prevented granular sludge bulking. A lower chemical oxygen demand/N favored the hydrophobicity of granular sludge, which promoted with granule stability because of the lower diffusion rate of ammonia. The influence of temperature indicated a relatively low temperature was more suitable. SN - 0273-1223 UR - https://www.unboundmedicine.com/medline/citation/25401316/Optimization_of_operation_conditions_for_preventing_sludge_bulking_and_enhancing_the_stability_of_aerobic_granular_sludge_in_sequencing_batch_reactors_ L2 - https://iwaponline.com/wst/article-lookup/doi/10.2166/wst.2014.406 DB - PRIME DP - Unbound Medicine ER -