State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China.
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China.
Water Res. 2018 Nov 1;144:763-773. doi: 10.1016/j.watres.2018.08.058. Epub 2018 Aug 27.
A novel AAO-SBSPR (Anaerobic-Anoxic-Oxic/Sequencing Batch Sidestream Phosphorus Recovery) process was developed for phosphorus (P) recovery and nutrient removal from municipal wastewater. Meanwhile, an operational strategy based on the P mass balance for the process was proposed, where P recovery rate was coupled with sludge retention time (SRT) so as to reduce the impact of P recovery on P content in activated sludge and maintain a stable operation of the process. The results show that the proposed operational strategy is helpful for the stable operation of the AAO-SBSPR process and up to 65% of the influent P was recovered with the phosphate removal efficiency of 99.1%. Both P recovery and extended SRT had limited influence on the P release and uptake rates of polyphosphate accumulating organisms (PAOs). The results of high-throughput sequencing analysis indicated that the relative abundance of Accumulibacter increased while SRT was extended under high P recovery rate. Moreover, significant promotion of simultaneous nitrogen removal and P uptake was observed, where the ratio of anoxic P uptake to the total P uptake of the whole process increased from 41.7% in the AAO process to 77.5% in the AAO-SBSPR process, combined with the increase of total nitrogen (TN) removal efficiency from 71.9% to 80.4%. The P recovery process is also beneficial for the reduction of sludge production and nitrification process as SRT was extended for high P recovery rate. Overall, the AAO-SBSPR process together with the operational strategy proposed in this study provides a promising and practical alternative for P recovery from municipal wastewater.
一种新型的厌氧-缺氧-好氧/序批式侧流磷回收（AAO-SBSPR）工艺被开发出来，用于从城市废水中回收磷（P）和去除营养物质。同时，为该工艺提出了一种基于 P 质量平衡的操作策略，其中 P 回收率与污泥停留时间（SRT）相关联，以降低 P 回收对活性污泥中 P 含量的影响，并维持工艺的稳定运行。结果表明，所提出的操作策略有助于 AAO-SBSPR 工艺的稳定运行，高达 65%的进水 P 得到回收，磷酸盐去除效率达到 99.1%。P 回收和延长 SRT 对聚磷菌（PAO）的磷释放和吸收速率均有有限的影响。高通量测序分析的结果表明，在高 P 回收率下，随着 SRT 的延长，Accumulibacter 的相对丰度增加。此外，还观察到同时脱氮和吸磷的显著促进，其中缺氧吸磷与整个过程总吸磷的比例从 AAO 工艺的 41.7%增加到 AAO-SBSPR 工艺的 77.5%，同时总氮（TN）去除效率从 71.9%增加到 80.4%。当 SRT 延长以实现高 P 回收率时，P 回收过程也有利于减少污泥产生和硝化过程。总的来说，AAO-SBSPR 工艺结合本研究提出的操作策略为从城市废水中回收磷提供了一种有前景和实用的替代方法。
