Partial nitrification and denitrification of mature landfill leachate using a pilot-scale continuous activated sludge process at low dissolved oxygen
Partial nitrification and denitrification of mature landfill leachate using a pilot-scale continuous activated sludge process at low dissolved oxygen
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DOI：
10.1016/j.biortech.2016.07.008
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发表时间：
2016-10-01
影响因子：
11.4
通讯作者：
Yuan, Yanlei
中科院分区：
文献类型：
--
作者：
Chen, Zhenguo;Wang, Xiaojun;Yuan, Yanlei
控制低溶解氧（DO）水平（0.1-0.5 mg/L）是一种具有成本效益的策略，被应用于中试规模的缺氧-好氧-好氧-缺氧工艺，对成熟的垃圾渗滤液进行部分硝化和反硝化。氨氮去除率高，亚硝酸盐积累率稳定，总氮去除率分别高于95.0%、90.0%和66.4%，表明该工艺在成熟垃圾渗滤液脱氮中具有潜在的应用前景。第一个好氧反应器中亚硝酸盐的有效积累取决于低溶解氧条件和足够的碱度。然而，操作限制主要由第一好氧反应器的实际水力停留时间（AHRT）决定，在DO为0.3-0.5 mg/L时，AHRT小于13.9 h。高通量测序分析表明，经过长期运行，第一个好氧反应器中的细菌多样性发生了显着变化，优势菌属亚硝化单胞菌被证明是低溶解氧水平下NH4+-N去除和亚硝酸盐积累的原因。 (C) 2016 Elsevier Ltd. 保留所有权利。
Controlling of low dissolved oxygen (DO) levels (0.1-0.5 mg/L), a cost-effective strategy, was applied to a pilot-scale anoxic-oxic-oxic-anoxic process for partial nitrification and denitrification of mature landfill leachate. High ammonium removal efficiency, stable nitrite accumulation rate and total nitrogen removal efficiency was higher than 95.0%, 90.0% and 66.4%, respectively, implying potential application of this process for nitrogen removal of mature landfill leachate. Efficient nitrite accumulation in the first oxic reactor depended on low DO conditions and sufficient alkalinity. However, operational limit was mainly decided by actual hydraulic retention time (AHRT) of the first oxic reactor and appeared with AHRT less than 13.9 h under DO of 0.3-0.5 mg/L. High-throughput sequencing analysis demonstrated significant change of bacterial diversity in the first oxic reactor after a long-term operation and dominant bacteria genus Nitrosomonas was shown to be responsible for NH4+-N removal and nitrite accumulation under low DO levels. (C) 2016 Elsevier Ltd. All rights reserved.