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首页> 外文期刊>RSC Advances >A cascade of a denitrification bioreactor and an aerobic biofilm reactor for heavy oil refinery wastewater treatment
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A cascade of a denitrification bioreactor and an aerobic biofilm reactor for heavy oil refinery wastewater treatment

机译：脱硝生物反应器和好氧生物膜反应器的级联，用于重油精炼厂废水处理

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摘要

The performance of an efficient denitrification bioreactor–aerobic biofilm reactor cascade for heavy oil refinery wastewater treatment was investigated. Optimum operation parameters for denitrification were found as follows: (1) hydraulic retention time of 8 h; (2) C/NO _(3) ~(?) –N molar ratio of 3.75 with acetate as the carbon source; (3) 20% (v/v) carrier filling ratio in the denitrification bioreactor. Under such optimal conditions, a volumetric removal of 0.82 kg N m ~(?3) d ~(?1) was obtained. As an alternative low-cost carbon source to acetate, secondary DAF effluent (COD/NO _(3) ~(?) –N mass ratio of 5.4) was also detected and a stable activity of denitrification was achieved with adding 25% volume fraction of secondary DAF effluent. Effluent COD of the subsequent aerobic biofilm reactor further decreased satisfying the requirements of the current discharge standards. High-throughput sequencing results exhibited that Rhodocyclaceae and Comamonadaceae were the dominant denitrifiers in the denitrification reactor and Pseudomonas was the dominant microbe in the aerobic biofilm reactor.
机译：研究了有效的反硝化生物反应器-好氧生物膜反应器级联反应在重油炼油厂废水处理中的性能。发现反硝化的最佳操作参数如下：（1）水力停留时间为8 h; （2）以乙酸盐为碳源的C / NO _（3）〜（η）–N摩尔比为3.75; （3）在反硝化生物反应器中20％（v / v）的载体填充率。在这样的最佳条件下，得到的体积去除率为0.82kg N m〜（？3）d〜（？1）。作为乙酸盐的替代低成本碳源，还检测到了次级DAF废水（COD / NO _（3）〜（？）–N质量比为5.4），并且通过添加25％的体积分数实现了稳定的反硝化活性。 DAF废水的排放。随后的好氧生物膜反应器的出水COD进一步降低，满足当前排放标准的要求。高通量测序结果表明，在反硝化反应器中，红景天科和科摩亚科是主要的反硝化剂，好氧生物膜反应器中的假单胞菌是主要的微生物。

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