期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 792, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.148297
关键词
Aerobic granular sludge; Low-strength municipal wastewater; Hydrolysis-acidification pretreatment; Simultaneous removal of C; N and P
资金
- Major Science and Technology Program for Water Pollution Control and Treatment of China [2017ZX07102-003]
The study found that reducing cycle length and implementing hydrolysis-acidification pretreatment could enhance anaerobic COD uptake, leading to a decrease in effluent TN and TP concentrations to meet Grade IA of effluent standards in China. Furthermore, the pretreatment improved the COD storage, phosphorus release, nitrification-denitrification process, and phosphorus uptake in different phases of the treatment process.
Low organic load while high fraction of particulates still challenging the application of aerobic granular sludge process in low-strength municipal wastewater treatment. The feasibility of adopting short cycle length to increase organic load and hydrolysis-acidification pretreatment to enhance anaerobic COD uptake was evaluated. As the cycle length decreased from 4 h to 2 h, the organic loading rate increased from 0.98 to 1.3 g L-1 d(-1) and granulation appeared after two weeks. Moreover, with the hydrolysis-acidification pretreatment, the average effluent TN and TP concentrations decreased respectively from 17.8 to 13.7 mg L-1 and 0.76 to 0.41 mg L-1, meeting the Grade IA of the effluent standards in China. Furthermore, cycle tests were conducted to reveal the underlying mechanism of the pretreatment effects. The results showed that the hydrolysis-acidification pretreatment enhanced the COD storage and phosphorus release in anaerobic phase, and improved the simultaneous nitrification-denitrification process, as well as the phosphorus uptake in aeration phase. (C) 2021 Elsevier B.V. All rights reserved.
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