The influence of sludge retention time on sludge flocculation in IFAS system

2017 3rd International Conference on Energy, Environment and Materials Science

能源学;生态环境科学;材料科学

Wang, Mengdi^1 ; Wen, Yue^1

State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai

200092, China^1

关键词: Effluent turbidity;    Extracellular polymeric substances;    Interaction energies;    Sequencing batch reactors;    Sludge flocculation;    Sludge retention;    Sludge retention time;    Trivalent cations;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/94/1/012091/pdf
DOI  :  10.1088/1755-1315/94/1/012091

来源: IOP

【 摘 要 】

The IFAS system was cultivated in five sequencing batch reactors. The sludge retention times (SRT) were 6 d, 8 d, 10 d, 15 d and 25 d respectively. In this dissertation, the influence of SRT on suspended sludge flocculation in IFAS system and its mechanisms were studied. It was found that in the IFAS system, the specific turbidity of supernatant and SVI value of suspended sludge both decreased as the SRT increased. In addition, extending SRT was capable of reducing the extracellular polymeric substances (EPS) content and the interaction energy barriers, increasing the percentage of bivalent and trivalent cations in pellet, thus improved the sludge flocculation and reduced effluent turbidity.