HEJun-guo,ZENGYi-wen,LIUXin-ping,et al.Rapid Cultivation of NZVI/AC-based Aerobic Granular Sludge and Its Wastewater Treatment Performance[J].China Water & Wastewater,2023,39(7):8-16.
Rapid Cultivation of NZVI/AC-based Aerobic Granular Sludge and Its Wastewater Treatment Performance
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第7期
Page:
8-16
Column:
Date of publication:
2023-04-01
- Keywords:
- urban sewage; aerobic granular sludge; rapid cultivation; activated carbon; nanoscale zerovalent iron
- Abstract:
- Aiming at the problems of structural instability and slow growth rate of aerobic granular sludge (AGS) caused by internal cavitation, activated carbon loaded nanoscale zerovalent iron (NZVI/AC) composite material was prepared and used as skeletons to enhance the rapid formation of AGS, and the performance of AGS for urban sewage treatment was improved by promoting electron transfer between species. The prepared NZVI/AC had both strong adsorption ability and conductivity, and its specific surface area reached 140.398 7 m2/g. It had a two-dimensional mesoporous structure with uniform pore size distribution, and increased the conductivity of pure water by 14.5 times. The NZVI/AC skeleton significantly accelerated the formation of AGS, and the average particle size reached 0.384 mm on the 10th day of cultivation, among which 7.23% AGS had a particle size above 0.5 mm, and AGS with particle size larger than 1 mm appeared. After 70 days, the AGS system reached a steady state, and the maximum settling velocity of AGS reached 73.09 m/h, which was increased by 95.32% compared with that of the blank group. The NZVI/AC-based AGS had a good performance for domestic sewage treatment. After 70 days of operation, the removal rates of COD, ammonia nitrogen and total nitrogen were more than 96%, 100% and 70.2%, respectively. NZVI/AC serving as skeletons for AGS cultivation has the advantages of short formation time, high stability and good performance for sewage treatment, and has the potential of engineering implementation.
Last Update:
2023-04-01