Towards a high-rate operation of contact stabilization process: A microscopic view of carbon capture properties

被引:1
|
作者
Fu, Sibo [1 ]
Li, Dong [1 ]
Fu, Kunming [2 ]
Zhang, Xiaohang [1 ]
Zhu, Yanjun [1 ]
Yang, Sen [1 ]
Zeng, Huiping [1 ]
Zhang, Jie [1 ,3 ]
机构
[1] Beijing Univ Technol, Key Lab Water Sci & Water Environm Recovery Engn, Beijing 100124, Peoples R China
[2] Beijing Univ Civil Engn & Architecture, Sino Dutch R&D Ctr Future Wastewater Treatment Tec, Key Lab Urban Stormwater Syst & Water Environm, Minist Educ, Beijing 100044, Peoples R China
[3] Harbin Inst Technol, State Key Lab Urban Water Resource & Environm, Harbin 150090, Peoples R China
基金
中国国家自然科学基金;
关键词
High-rate contact stabilization; Sludge retention time; Extracellular carbon capture; Intracellular carbon storage; Acyl-homoserine lactones; GLYCOGEN-ACCUMULATING ORGANISMS; WASTE-WATER TREATMENT; REMOVAL; BIOSORPTION; PHOSPHORUS; SEWAGE; SYSTEM;
D O I
10.1016/j.envres.2024.120113
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Carbon capture performance is a key factor determining the chemical energy recovery potential of the high-rate contact stabilization (HiCS) process. However, the mechanisms of organic carbon capture are complex, involving surface adsorption, extracellular adsorption, and intracellular storage. A unique characteristic of the HiCS process is its low sludge residence time (SRT). Unfortunately, the influence of SRT on carbon capture has not been thoroughly studied, especially in terms of the underlying mechanisms. In this study, the microscopic changes in carbon capture performance during the transition from a conventional contact stabilized (CS) system to a highrate mode of operation were demonstrated using intracellular carbon sources, extracellular polymeric substances (EPS), signaling molecules, and microbial community assays. The results showed that the extracellular carbon adsorption and intracellular carbon storage performance increased, and the microbial community structure changed significantly with converting the CS system to the high-rate operation mode. The enhancement of extracellular carbon adsorption performance mainly relied on the growth of EPS, which was accomplished by the strong growth of the relative abundance of the dominant bacterial group Cloacibacterium within the HiCS system, offsetting the negative effect produced by the decline of acyl-homoserine lactones. 98 mgCOD/gSS, 343 mgCOD/ gSS, and 500 mgCOD/gSS of polyhydroxyalkanoates (PHAs) per sludge unit were obtained at SRT-24d, 8d, and 2d, respectively, suggesting that the HiCS system is more advantageous for rapid PHAs production.
引用
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页数:10
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