用CO_2改性碱渣废水强化炼油废水的硝化效能

针对炼油废水缺乏碱度而硝化效能受限问题,以CO_2曝气处理后的改性碱渣废水为碱度补充剂,按一定配比加入炼油废水好氧阶段以强化硝化效能。实验结果表明:经流量为1 L/min的CO_2连续曝气处理5 h后,碱渣废水p H可降至7.2~7.8,钙元素质量浓度可降低90.65%,并去除了部分汞、砷等有毒重金属;将该改性碱渣废水以1∶99的体积比加入炼油废水并进行生化处理,COD去除率可达90.2%;相较于未补充碱渣的炼油废水,出水ρ(NO3--N)提高25%~30%,硝化细菌菌群密度增加52%,污泥絮体形态结构未发生改变。

Enhancement of oil refining wastewater nitrification efficiency by CO2 modified alkaline wastewater

Aiming at the problem of limited nitrification efficiency of alkalinity-lacking refinery wastewater,the alkaline wastewater modified by CO₂ aeration treatment was used as alkalinity supplement and added into the refinery wastewater at aerobic stage by a certain proportion to enhance the nitrification efficiency. The experimental results show thatAfter continuous CO₂ aeration treatment with 1 L/min of flow for 5 h,pH of alkaline wastewater is decreased to 7.2-7.8,the mass concentration of calcium element is reduced by 90.65%,and some heavy metals such as mercury and arsenic are removed;When the modified alkaline wastewater is added into the refinery wastewater with 1∶99 of volume ratio for biochemical treatment,the COD removal rate can reach 90.2%;Comparing with the refinery wastewater without alkaline wastewater,the effluent ρ（NO₃^--N） is increased by 25%-30%,the density of nitrifying bacteria is increased by 52%,and the morphology and structure of sludge floc are not changed.