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宝钢焦化废水处理脱氮研究与实践

Keywords: 焦化废水,生物脱氮,反硝化碳源,工艺改造

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Abstract:

针对上海提高新排放标准中总氮(TN)≤35mg/L的要求,对焦化废水进行了脱氮研究。选取现场缺氧-好氧-好氧(A-O-O)工艺中前两段的A-O生化沉淀池1出水,在SBR内进行反硝化脱氮实验,考察葡萄糖、葡萄糖+乙酸钠、甲醇和甲醇+乙酸钠单一或复合碳源及投加反硝化菌种对脱氮的影响,确定最佳碳源为甲醇+乙酸钠,最佳反硝化水力停留时间为16h。当反硝化菌液投加浓度为1mg/L时,SBR出水TN满足达标排放要求。结合实验结果对宝钢焦化废水原有A-O-O工艺改造升级为A-O-A-O二段脱氮工艺,并对生化出水实施进一步的物化混凝处理。改造后,工艺长期运行稳定,最终出水完全达到上海市污水综合排放标准(DB31/199-2009)TN≤35mg/L的要求,并满足氰化物、氟化物以及COD的排放要求。

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