Key Laboratory of Yangtze Water Environment of Ministry of Education, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China.
Bioresour Technol. 2013 Feb;130:406-11. doi: 10.1016/j.biortech.2012.11.129. Epub 2012 Dec 12.
Airlift loop reactors (ALRs) are important bioreactors for wastewater treatment. However, few studies have investigated the application of an ALR for simultaneous carbon and nutrient removal, especially for activated sludge systems. This study evaluated the performance of integrated nitrogen, phosphorus and COD removal in an ALR with a low height-to-diameter ratio in a limited filamentous bulking (LFB) state (SVI of 180-220mL/g). The average removal efficiencies for COD, NH(4)(+)-N, TN and TP were 91%, 92%, 86% and 94%, respectively. Additional research showed that only under the LFB state, the appropriate distribution of dissolved oxygen inside the ALR was established to promote a well-balanced aerobic and anoxic/anaerobic state. In addition, the macro-gradient of the substrate concentration at the inlet and the heavier bio-P sludge density compensated for the proliferation of filaments. Hence, the stable LFB state was achieved by balancing the floc-forming bacteria and the filamentous bacteria in the ALR.
气升式环流反应器（ALRs）是用于废水处理的重要生物反应器。然而，很少有研究探讨 ALR 在同步碳和养分去除方面的应用，特别是在活性污泥系统中。本研究评估了在低高径比和有限丝状菌膨胀（LFB）状态下（SVI 为 180-220mL/g），ALR 中综合氮、磷和 COD 去除的性能。COD、NH(4)(+)-N、TN 和 TP 的平均去除效率分别为 91%、92%、86%和 94%。进一步的研究表明，只有在 LFB 状态下，才能在 ALR 内建立适当的溶解氧分布，促进好氧和缺氧/厌氧状态的良好平衡。此外，在入口处底物浓度的宏观梯度和较重的生物-P 污泥密度补偿了丝状菌的增殖。因此，通过在 ALR 中平衡形成絮体的细菌和丝状菌，实现了稳定的 LFB 状态。
