Activity recovery effect of aerobic granular sludge stored in phenol solution
LIU Qianjin1,2,, LIU Lifan1,, 1.School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China 2.Shenzhen Water (Group) Co. Ltd., Shenzhen 518000, China
Abstract:In this study, the activity recovery of the stored aerobic granular sludge was conducted by regulating the influent COD, aeration and sludge settling time of the SBR, which will provide a reference for the selection of aerobic granular sludge activity recovery methods. The results showed that aerobic granular sludge stored in 60 mg·L?1 phenol solution for 150 d at room temperature could regain its structural integrity and microbial activity after 28 d of incubation. Aerobic granular sludge underwent an evolutionary process from fragmentation to reconstruction during activity recovery. The recovered aerobic granular sludge had a good settleability, high microbial load and activity, SVI30 and SVI5 were 26.1 mL·g?1 and 27.6 mL·g?1, respectively, MLSS and MLVSS were 16 903 and 12 001 mg·L?1, respectively, and MLVSS/MLSS was 0.71, and DHA was 71.36 μg·(g·h)?1. The EPS fraction of aerobic granular sludge changed continuously during the recovery period, representing a gradual increase in fluorescence intensity of tyrosine/tryptophan-like proteins and aromatic protein-like substances with the recovery of granular sludge activity. The recovered aerobic granular sludge showed 97.34%, 89.88% and 64.37% removal of COD, TP and TN, respectively. Key words:aerobic granular sludge/ activation recovery/ storage/ decontamination effect/ phenol.
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1.School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China 2.Shenzhen Water (Group) Co. Ltd., Shenzhen 518000, China Received Date: 2021-07-11 Accepted Date: 2021-08-26 Available Online: 2021-11-18 Keywords:aerobic granular sludge/ activation recovery/ storage/ decontamination effect/ phenol Abstract:In this study, the activity recovery of the stored aerobic granular sludge was conducted by regulating the influent COD, aeration and sludge settling time of the SBR, which will provide a reference for the selection of aerobic granular sludge activity recovery methods. The results showed that aerobic granular sludge stored in 60 mg·L?1 phenol solution for 150 d at room temperature could regain its structural integrity and microbial activity after 28 d of incubation. Aerobic granular sludge underwent an evolutionary process from fragmentation to reconstruction during activity recovery. The recovered aerobic granular sludge had a good settleability, high microbial load and activity, SVI30 and SVI5 were 26.1 mL·g?1 and 27.6 mL·g?1, respectively, MLSS and MLVSS were 16 903 and 12 001 mg·L?1, respectively, and MLVSS/MLSS was 0.71, and DHA was 71.36 μg·(g·h)?1. The EPS fraction of aerobic granular sludge changed continuously during the recovery period, representing a gradual increase in fluorescence intensity of tyrosine/tryptophan-like proteins and aromatic protein-like substances with the recovery of granular sludge activity. The recovered aerobic granular sludge showed 97.34%, 89.88% and 64.37% removal of COD, TP and TN, respectively.