【作者】 程娅先；

【导师】 冯素敏；

【作者基本信息】 河北科技大学 ， 土木工程， 2015， 硕士

【摘要】 化工行业能耗多、污染程度高,产生的废水有机物浓度高,含盐量高,水量不稳定,可生化性差,十分难处理。本研究通过收资调研,针对河北某化工企业二级生化出水,分别进行了混凝沉淀、臭氧氧化和曝气生物滤池各单元实验研究,对各运行参数进行了优化筛选,确定采用“混凝+臭氧氧化+曝气生物滤池”组合工艺进行深度处理,以满足《污水综合排放标准》（GB8978-1996）中的一级排放要求。实验结果如下:（1）混凝实验研究最佳控制条件为:混凝剂PAC投加量为0.75g/L,助凝剂PAM投加量为10mg/L,初始pH为8,沉降时间为30min。在此条件下,混凝法对COD、NH₄⁺-N和SS的去除率分别能达到44.6⁴8.2%、9.4¹1.4%和76.2⁸1.4%;（2）臭氧氧化实验研究最佳控制条件为:臭氧接触时间为60min,臭氧投加量为0.75g/L,气源为氧气源,在此条件下废水B/C由0.1提高至0.27,可生化性增强;COD和NH₄⁺-N去除率分别达到48%和8%,色度降到50倍以下;（3）曝气生物滤池实验研究的最佳控制条件为:HRT=3h,气水比为3:1,在此条件下BAF对COD、NH₄⁺-N的去除率分别为63%和50%;（4）组合工艺在以上各处理单元最佳控制条件下,COD、NH₄⁺-N和SS的去除率分别为88%、66%和86.3%,出水色度在50倍以下,废水水质得到明显改善,满足《污水综合排放标准》﹙GB8978-1996)中的一级排放要求。更多还原

【Abstract】 The chemical industry has energy consumption, high pollution levels, it produces high salinity and high concentrations of organic wastewater, the water is not stable and very difficult to deal with. Through the research on the two levels of biochemical effluent from a chemical enterprise in Hebei Province, the experimental study on the coagulation sedimentation, ozone oxidation and biological aerated filter was carried out. The operation parameters were optimized and the combined process was determined by the combined process of coagulation + ozone oxidation + biological aerated filter（GB8978-1996）. The experimental results are as follows:（1） Optimal control conditions for coagulation is: PAC coagulant dosing quantity is 0.75 g/L, coagulant aid PAM dosing quantity of 10 mg/L, the initial pH of 8, under the condition of the settling time for 30 min, the COD and SS removal rate can reach 44.6⁴8.2% and 76.2⁸1.4%, SS concentration standards; NH₄⁺-N removal is not obvious, the removal rate is only 9.4¹1.4%;（2） Optimal control conditions for ozone oxidation is: Ozone exposure time is 60 min, O3 feeding amount is 0.75 g/L, B/C value of the waste water being treatment increased from 0.1 to 0.27 had improved the biodegradability, Ozonation had good removal efficiencies for COD and NH₄⁺-N is 48% and 8% and chroma removal to 50 degrees;（3） Optimal control conditions for aeration biological filter is: Aeration biological filter for 3h in HRT, gas water ratio of 3:1, the removal rate of COD, NH₄⁺-N were 63% and 50% respectively;（4） Joint process under the best operation condition, the removal rate of COD, ammonia nitrogen and SS were 88%, 66% and 86.3%, water colour below 50 degrees, significantly improve the wastewater quality, meet the integrated wastewater discharge（GB8978-1996） level of emission standards.更多还原