High-rate nitrogen removal and its behavior of granular sequence batch reactor under step-feed operational strategy.
High-rate nitrogen removal and its behavior of granular sequence batch reactor under step-feed operational strategy.
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DOI：
10.1016/j.biortech.2013.01.155
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发表时间：
2013-04
影响因子：
11.4
通讯作者：
Chen Zhong;Ya-qin Wang;Yongjian Wang;Junping Lv;Yaochen Li;Jian-rong Zhu
中科院分区：
文献类型：
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作者：
Chen Zhong;Ya-qin Wang;Yongjian Wang;Junping Lv;Yaochen Li;Jian-rong Zhu
采用A/O交替缺氧/好氧（A/O）工艺与分段进水颗粒序批式活性污泥法（SBR）相结合的工艺进行脱氮试验。结果表明，当进水总无机氮（TIN）和化学需氧量（COD）分别为55和320 mg/L时，在360 min的运行周期内，分段进水模式对TIN的去除率为89.7-92.4%，而常规交替A/O单进水模式对TIN的去除率为48.1-59.5%。以pH和溶解氧（DO）为指标，对分段进水模式下的反硝化和硝化过程进行了优化。优化后的运行条件为：循环时间缩短至207 min，脱氮率为0.27kgN/m3 d，远高于活性污泥法。好氧颗粒污泥中的优势菌群为类球菌，丝状菌很少，在90天的连续分段投料运行中，颗粒污泥的菌群维持良好。
Alternating anoxic/oxic (A/O) combined with the step-feed granular sequence batch reactor (step-feed SBR) was operated in laboratory scale to investigate nitrogen removal. The results showed that when the total inorganic nitrogen (TIN) and chemical oxygen demand (COD) levels were 55 and 320mg/L in the influent, the TIN removal efficiencies were 89.7–92.4% in the step-feed mode and 48.1–59.5% in the conventional alternating A/O single-feed mode within a 360min cycle. The pH and dissolved oxygen (DO) were used to optimize the process of denitrification and nitrification in the step-feed mode. The optimized operational condition was achieved by shortening the cycle time to 207min, resulting in a nitrogen removal rate of 0.27kgN/m3d, which was much higher than those achieved using activated sludge systems. The dominant community in the aerobic granules was coccus-like bacteria, and filamentous bacteria were hardly found. Granules were well maintained throughout the 90days of continuous step-feed operation.