【作者】 刘岩龙；

【导师】 朱文亭；

【作者基本信息】 天津大学 ， 环境工程， 2007， 硕士

【摘要】 曝气生物滤池(BAF)是在普通生物滤池的基础上,借鉴给水滤池工艺开发的污水处理新工艺。曝气生物滤池采用颗粒滤料,集截留悬浮物和生物处理功能于一体,具有过滤、吸附、生物降解等功能。运行实践表明,它具有占地面积小、处理效率高、抗冲击负荷能力强、无需二沉池、出水水质好等优点。本试验采用前置反硝化曝气生物滤池处理模拟生活污水,研究了前置反硝化曝气生物滤池工艺对有机物、氮的去除效果,摸索其去除污染物质的规律,力求得出其最佳工况参数,为前置反硝化曝气生物滤池工艺在我国污水处理领域的推广提供理论依据。试验结果表明,前置反硝化曝气生物滤池对模拟生活污水具有良好的净化效能。在水力负荷为1.57m/h～2.52m/h(不包括回流);回流比为200%,;气水比为5:1的条件下,反应器对COD、氨氮和总氮的去除率分别为88.77%、80.51%和64.51%,出水COD、氨氮和总氮的平均值分别为37.98mg/L、4.91 mg/L和14.68 mg/L,能够满足城市杂用水的主要水质标准。COD、氨氮和总氮主要在缺氧区内得到去除,它们在缺氧区内的去除率分别为80.56%、68.41%和54.29%。试验考察了水力负荷、回流比、容积负荷、进水水温和pH值对反应器处理效能的影响。试验结果表明,在水力负荷为2.04m/h,回流比为200%,COD容积负荷在8 kg/(m3·d)以下的工况下,反应器对污染物的去除效率较高。气水联合反冲洗可以有效地对曝气生物滤池进行反冲洗。反冲洗后运行5～6个小时出水COD浓度即可恢复到正常水平,浊度只需1～2个小时即可恢复到正常水平,反冲洗对氨氮的去除影响比较小。更多还原

【Abstract】 Biological Aerated Filter (BAF) is a recently developed process which is used for the advanced wastewater treatment. A major characteristic of BAF reactors is the use of granular media which integrated solids separation as well as secondary or tertiary biological treatment in one unit. It has the function of filtration, adsorption and biodegradation, etc. The practical operation proves that it has advantages of less land occupied, high treatment efficiency, higher capacity for absorbing shockload, no requirement for secondary settling tanks and the quality of effluent reaches the standard.This paper focuses on the experimental study on the Biological Aerated Filter with pre-denitrification for synthetic municipal wastewater treatment. The paper analyzes the removal efficiency and regularity of the organic matter and nitrogen, and gets the best operating parameters. Also, it will generalize the theory for the advance of the Biological Aerated Filter with pre-denitrification process in wastewater treatment of our country.The experimental results show that the performance of Biological Aerated Filter with pre-denitrification for sewage treatment is excellent. Under the hydraulic load of 1.57m/h~2.52m/h(do not include reflux), the reflux ratio of 200%, air/water ratio of 5:1, the average value of COD, NH4+-N and TN of effluent is 37.98mg/L, 4.91 mg/L and 14.68 mg/L,the average removal percent of COD, NH4+-N and TN is 88.77%, 80.51% and 64.51%. The effluent quality is acceptable and meets the municipal grey water standard. The experimental results also show that most of COD, NH4+-N and TN is reduced in the anoxic zone.The objective of the experiments is to study the influence of hydraulic load, reflux ratio, capacity load, influent temperature and pH. The experimental results show that it will get high pollutants removal efficiency under the hydraulic load of 2.04m/h(do not include reflux), the reflux ratio of 200%, the COD capacity load less than 8 kg/(m3·d).Gas-water backwash is effective for Biological Aerated Filter. The COD of effluent can recover to normal in 5~6 hours. The turbidity can recover to normal in 1~2 hours. The removal of NH4+-N is less affected by backwash process.更多还原