生化法耦合臭氧氧化工艺深度处理污泥干化冷凝液

Biochemical method coupled with ozonation process for advanced treatment of sludge drying condensate

针对污泥干化冷凝液这类高氨氮、高油分工业废水,设计了一套“隔油-气浮-A~2O-MBR-臭氧催化氧化”联用工艺对其进行深度处理。常规工况下COD、TN、NH_(3)-N和TP的去除率均能达到99%以上,但TN与NH_(3)-N指标仍然超出地表Ⅲ类水标准。针对A~2O模块的进水流量、回流比进行调控,建立多模块组合工艺的Optimal(custom) Design模型,模拟理论出水TN与NH_(3)-N低于1.0 mg/L的工况,并通过14 d连续稳定运行验证了出水TN与NH_(3)-N最低工况的合理性。对冷凝液处理过程中油分的沿程分布进行了探索,其中物理隔油对油分的去除率为84.42%,剩余油分由A~2O+MBR的生物消耗与污泥吸附去除。分离获得的油分热值为37.26 MJ/kg,与煤按比例掺烧后可用于电厂发电,解决火电厂废油处置问题的同时又提高了燃煤放热量。

Aiming at the industrial wastewater with high NH_(3)-N and high oil content such as sludge drying condensate,a combined process of oil separation,air flotation,A^(2)O,MBR and ozone catalytic oxidation was designed to carry out advanced treatment of the condensate.The removal rates of COD,TN,NH_3-N and TP could all reach more than 99%under normal working conditions,but the TN and NH_3-N indicators still exceeded the standard of surface ClassⅢwater.The Optimal(custom) Design model of the multi-module combined process was established to adjust the influent flow rate and reflux ratio of the A^(2)O module,and simulated the theoretical operating conditions that the effluent TN and NH_3-N were lower than 1.0 mg/L.The rationality of the minimum operating conditions of effluent TN and NH_3-N was verified through 14 days of continuous stable operation.The distribution of oil along the process of condensate treatment was explored.The oil removal rate of physical oil separation was 84.42%,and the remaining oil was removed by biological consumption and sludge adsorption of A^(2)O+MBR.The calorific value of the oil obtained by separation was 37.26 MJ/kg,which could be used for power generation in power plants after being mixed with coal in proportion to solve the problem of waste oil disposal in thermal power plants and at the same time improve the heat release of coal combustion.