Treating organic cyanide-containing groundwater by immobilization of a nitrile-degrading bacterium with a biofilm-forming bacterium using fluidized bed reactors
Treating organic cyanide-containing groundwater by immobilization of a nitrile-degrading bacterium with a biofilm-forming bacterium using fluidized bed reactors
复制标题
使用流化床反应器通过生物膜形成细菌固定化腈降解细菌来处理含有机氰化物的地下水
DOI：
10.1016/j.envpol.2018.01.087
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发表时间：
2018
影响因子：
8.9
通讯作者：
Li Chunyan
中科院分区：
文献类型：
--
作者：
An Xuejiao;Cheng Yi;Huang Mingyan;Sun Yueling;Wang Hailan;Chen Xi;Wang Jinming;Li Dapeng;Li Chunyan
有机氰化物被广泛用作塑料、合成橡胶、聚合物、药品和杀虫剂生产中的一种成分，或在实验室和工业中用作溶剂。尽管含腈废水经过一级和二级处理，但残留的氰化物可能会缓慢渗入地下水，并进一步通过地下水迁移，导致有机污染物对地下水的微污染。本研究于2013年至2015年在中国北部不同研究区采集水样，分析评价地下水中有机氰化物(CN−)的污染状况。对三个平行的实验室规模的沸腾床反应器(FBR)去除地下水中有机氰化物的能力进行了测试。从2013年到2015年，地下水中有机氰化物浓度显著增加(P <； 0.05)。在最佳水力停留时间为54 m in的条件下，R3反应器(接种有降解氰菌BX2和生物膜形成菌M1)在稳定运行条件下对CN-−的去除效率高达99.8%，优于其他反应器。短期停运对有机氰化物的处理效率没有严重影响。研究结果表明，生物膜形成菌能促进丁腈降解菌的固定，提高地下水中有机氰化物的去除效率。
Organic cyanide are widely used as an ingredient in the production of plastics, synthetic rubbers, polymers, pharmaceuticals and pesticides or used in laboratories and industries as solvents. Although nitrile-containing wastewater is subjected to primary and secondary treatments, residual nitriles may slowly seep and further migrate through groundwater, resulting in the micropollution of groundwater by organic pollutants. In this study, water samples were collected from different study areas in North China during a period of 3y (from 2013 to 2015) and analyzed to evaluate organic cyanide (CN−) contamination in groundwater. Three parallel lab-scale fluidized bed reactors (FBRs) were tested for their ability to remove organic cyanide from groundwater. The organic cyanide concentration in groundwater increased significantly (P < 0.05) from 2013 to 2015. With an optimal hydraulic residence time (HRT) of 54 min, reactor R3 (inoculated with a nitrile-degrading bacterium, BX2, and a biofilm-forming bacterium, M1) effectively removed 99.8% of CN−under steady operation, which was better than that of other reactors. Short-term shutdowns of FBRs had no serious effects on the efficiency of treating organic cyanide. This work demonstrated that the biofilm-forming bacterium could facilitate the fixation of nitrile-degrading bacterium and enhance the efficiency of removing organic cyanide from groundwater.