Application of CANON process for nitrogen removal from anaerobically pretreated husbandry wastewater
Application of CANON process for nitrogen removal from anaerobically pretreated husbandry wastewater
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DOI：
10.1016/j.ibiod.2018.09.010
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发表时间：
2019
影响因子：
4.8
通讯作者：
Tu V. Huynh;P. Nguyen;T. Phan;D. Luong;Thi Thanh Phuong Truong;Khanh An Huynh;K. Furukawa
中科院分区：
文献类型：
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作者：
Tu V. Huynh;P. Nguyen;T. Phan;D. Luong;Thi Thanh Phuong Truong;Khanh An Huynh;K. Furukawa
本研究采用全自养亚硝酸盐脱氮(CANON)工艺和简单曝气相结合的连续搅拌槽反应器，研究了厌氧预处理畜牧废水的脱氮效果。在水力停留时间(HRT)分别为16、8和6 h的条件下，反应器的平均氮负荷逐步增加，分别为0.47、0.95和1.16 kg N m−3D−1。在水力停留时间为8 h(NLR为0.95 kg N m−3D−1)时，可获得最高且稳定的脱氮效果。关键操作条件是间歇曝气以维持较低的溶解氧浓度(0.10.2 mg L−1)和调节碱度以获得7.67.8的pH值。出水水质达到越南养殖废水总氮标准(<；150 mg L−1N)。饲料废水中高浓度的化学需氧量(>；400 mg L−1)降低了氨氧化细菌的活性。在较短的水力停留时间(6 h)下，含有好氧异养菌和AOB的细小生物群被冲刷掉，而微红色的厌氧氨氧化颗粒仍留在反应器中。
In this study, the removal of nitrogen from anaerobically pretreated husbandry wastewater using a continuous stirred tank reactor of a completely autotrophic nitrogen removal over nitrite (CANON) process coupled with a simple aeration setup was investigated. The reactor was operated with anaerobically pretreated husbandry wastewater at hydraulic retention times (HRTs) of 16, 8, and 6 h with stepwise increased in average nitrogen loading rates (NLRs) of 0.47, 0.95, and 1.16 kg N m−3d−1. The highest and stable nitrogen removal was obtained at HRT of 8 h (NLR of 0.95 kg N m−3d−1). The key operating conditions were intermittent aeration for maintaining low dissolved oxygen concentrations (0.1–0.2 mg l−1) and alkalinity adjustment for obtaining pH values of 7.6–7.8. The effluent quality met Vietnamese husbandry wastewater standard for total nitrogen (<150 mg l−1N). High chemical oxygen demand (COD) concentration (>400 mg l−1) in the feed wastewater reduced ammonia oxidizing bacteria (AOB) activity. At shorter HRT (6 h), the washout of fine bioflocs containing aerobic heterotrophs and AOB occurred, while the reddish anammox granules still remained in the reactor.