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.
NZVI/AC基好氧颗粒污泥快速培养及污水处理效能
- Title:
- Rapid Cultivation of NZVI/AC-based Aerobic Granular Sludge and Its Wastewater Treatment Performance
- Keywords:
- urban sewage; aerobic granular sludge; rapid cultivation; activated carbon; nanoscale zerovalent iron
- 摘要:
- 针对好氧颗粒污泥（AGS）存在内部空穴化导致的结构不稳定以及生长速度慢等问题，制备活性炭负载纳米零价铁（NZVI/AC）复合材料，以NZVI/AC作为骨架强化AGS的快速形成，并通过促进微生物种间电子传递来提高AGS对城镇生活污水的处理效能。结果表明，制备的NZVI/AC兼具强吸附性和强导电性，比表面积可达到140.398 7 m2/g，具有孔径分布均匀的二维介孔结构，并可使纯水电导率提高14.5 倍。以NZVI/AC作为骨架可显著促进AGS的形成，培养第10天平均粒径即可达到0.384 mm，其中7.23%的AGS粒径在0.5 mm以上，并出现粒径>1 mm的AGS；70 d后AGS培养体系达到稳定，AGS最大沉速达到73.09 m/h，较空白组提升95.32%。以NZVI/AC为骨架的AGS对城镇生活污水具有良好的处理效能，运行70 d后对COD、氨氮和总氮的去除率分别可达到96%以上、100%、70.2%。以NZVI/AC为骨架培养AGS具有颗粒形成快、结构稳定性高、对污水处理效果好等优点，具有工程化实施的潜力。
- 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.
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