【作者】 王进；

【导师】 温沁雪；

【作者基本信息】 哈尔滨工业大学 ， 环境工程（专业学位）， 2016， 硕士

【摘要】 伴随着我国经济的飞速增长,人们对物资的需求结构也在发生着很大的变化,越来越多的化工产品进入到日常生活当中。不可否认,这些产品给人们的日常生活带来了极大的便利,但是同时由于种种原因在其生产过程产生了许多对环境有害的物质,他们大多具有一定的生物毒性,其生物降解性能也差,这给产业末端环境综合治理造成了严峻的挑战。本课题以江苏省某化工园区污水处理厂为研究对象,在对污水厂现状调研及问题分析诊断的基础上,针对常规进水条件下生化池除污效能低和高比例化工废水进水下生化出水中难降解有机物大量残留的现实问题,以实现污水厂长期稳定运行达标排放为目标,设计并构建了循环式复合水解酸化-CASS-混凝沉淀-砂滤-催化臭氧化组合工艺。在结合实际水厂可行性的基础上,在常规进水条件下开展了循环式复合水解酸化-CASS-混凝沉淀组合系统强化除污染效能的研究,通过小试实验优化了组合工艺各单元的运行参数,确定了组合工艺最适合的运行方式为水解酸化反应器HRT保持8h;CASS工艺运行方式为每个周期6h,连续进水,周期初开始曝气4h,沉淀1h,排水1h,主反应区曝气末端污泥浓度在3200mg/L左右,溶解氧在3.0 mg/L左右,污泥龄28.8d,内回流比200%,排水比0.25;混凝沉淀池投加药剂为聚合铝铁,投加量为3.6mg/L(以铁计)。在此运行工况下,在水温15~20℃时,组合工艺对COD、NH3-N、TN和TP平均去除率分别高达83.29%、95.34%、61.29%、82.70%,出水水质除COD外均达到了一级A标准。研究了高比例化工废水冲击下非均相催化臭氧化深度处理化工园区污水生化出水的效能和影响因素,在结合工程可行性的基础上初步确定了最合适的反应条件为原水水温、p H,催化剂填充量500 g/L,臭氧投加量0.96 g/h,反应时间30min。在此工况下催化剂重复使用中对污水COD的去除率大致在63%上下变化波动。通过向连续流催化臭氧化系统进水中添加叔丁醇捕获羟基自由基,在一定程度上抑制了催化剂活性的表达,初步判断出该非均相催化剂催化臭氧化深度处理化工园区污水生化出水反应的过程可能是以羟基自由基氧化反应为主导,其它多种氧化反应交叉协同作用的过程,同时,借助GC-MC技术手段对催化臭氧化进出水进行了定性分析,在此基础上探讨分析了反应过程中有机物种类、结构及分子量分布的变化规律,为化工废水深度处理提供了理论基础和技术支撑。本课题的研究具有较高的实际工程意义和应用价值,其研究成果不但对A污水处理厂进行下一步生产提标改造工作具有直接指导意义,而且对于受纳有化工废水的同类污水处理厂有很好的借鉴及应用价值,同时也有助于进一步改善太湖区域的水环境质量。更多还原

【Abstract】 Along with the rapid growth of economy in China, the demand for construction materials in daily life is also undergoing great changes, more and more chemical synthetic products come into our life. These products have brought great convenience to our life, however, at the same time, they also produces a large number of environmental problems. Most of these products are biological toxic and hard to be biodegraded, which causes severe challenges to th e comprehensive environmental governance in end treating processes in industries.The study in this paper was carried out in a wastewater treatment plant(WWTP) located in Yixing, Jiangsu province. Based on the present situation of the WWTP operation and problem analysis diagnostics, a combined process of Cyclic Combined Hydrolytic Acidification-Cyclic Activated Sludge System(CASS) –Flocculation Sedimentation-Sand Filtration-Catalytic Ozonation was designed and developed. Pollutants removal of the process and the practical feasibility of the operating strategy were investigated. The operating parameters of each unit were optimized through small scale experiments and the most appropriate operating strategy were: HRT in the hydrolysis acidification reactor was 8h, CASS process was operated with each cycle of 6h, including continuous water inlet and aeration 4h, precipitation 1h and discharge 1h, MLSS 3200mg/L, DO 3.0 mg/L, SRT 28.8d, a reflux ratio of 200%, and drainage ratio of 0.25. Meanwhile, the dosage o f olymeric aluminum ferric in the flocculation sedimentation tank was 3.6mg/L(measured by iron). Under these conditions, the average removal rate of COD, NH3-N, TN and TP were as high as 83.29%, 95.34%, 61.29%, 82./7%, respectively, which means the effluent can met the A level of class one standard of discharge standard of pollutants for municipal wastewater treatmentplant.Treatment performance and effects of important operating parameters of heterogeneou catalytic ozonation of biologically treated efflue nt were investigated under the condition that high proportion of chemical industry waste water were presented. Considered the practical feasibility, the most suitable reaction conditions have been determined, which were: catalyst filling capacity of 500g/L, ozone dosage of 0.96g/h, and the reaction time of 30 min under the condition of real water temperature and p H(without regulation). Under this condition, the catalyst were repeated being used for 8 days, a relatively stable COD removal efficiency of 63% was invesitgated. This showed the repeated use of the catalyst is possible, and the catalyst was suitable for industrial applications.Through the additional of hydroxyl radical scavenger to the influent of the continuous catalytic ozonation, the expression of catalytic activity was seriously inhibited, which preliminary explored the ozone catalyzed reaction mechanism. The oxidation process of the catalytic ozonation could be a mainly indirect oxidation of ?OH reaction as well as a variety of oxidation as synergistic effects. Meanwhile, based on the qualitative analysis of the pollutants in the influent and effluent in catalytic ozonation process through GC-MC, the chemical structure, molecular weight distribution and their transformation were explored, which provided a theoretical and technical support for chemical wastewater treatment.The research has a high practical engineering significance and value, and the research results will not only help the operation of the WWTP A for upgrading and reconstructing, but also have a good reference value for WWTP with similar influent in chemical industry parks. Further more, it also helps to improve the water environment quality in Taihu watershed.更多还原