臭氧催化氧化在纺织染整综合废水深度处理中的中试研究

发布时间：2018-05-03 10:56

本文选题：印染综合废水 + 深度处理　；参考：《华北水利水电大学》2017年硕士论文

【摘要】：纺织印染企业属于高耗水、高污染企业,企业多沿江(河)分布,对流域水污染物排放贡献率大。自《纺织染整工业水污染物排放标准》(GB4287-2012)颁布实施以来,为响应国家完成“十二五”污染减排任务、减轻重点流域的污染负荷,必须对纺织染整综合废水进行深度处理,以进一步的去除废水中的污染物质来满足排放标准和削减重点流域的污染负荷的要求。本课题的中试研究在浙江省某城市的纺织印染工业园区内的大型污水处理厂进行,以高效澄清池出水作为中试的研究对象。在全面地综述了印染废水的深度处理方法、臭氧催化氧化影响因素、催化臭氧氧化的催化剂类型、臭氧系统以及臭氧催化氧化反应装置的结构基础上,提出了采用金属离子负载型催化剂催化臭氧氧化的工艺作为纺织染整综合废水的深度处理工艺。通过污水处理厂实验室小试研究了影响臭氧催化氧化处理印染废水的因素,比如:臭氧投加量、反应时间(HRT)、pH等因素;通过设计正交实验并对正交实验结果进行直观分析,确定出影响臭氧催化氧化因素的主次顺序以及最优的实验室臭氧催化氧化条件;在经过最优条件下的小试实验验证之后,得出了臭氧催化氧化最佳反应条件;实验室小试表明催化臭氧氧化的最佳反应条件是:臭氧投加量为145mg/L、反应时间为100min、pH为6.0。在最佳反应条件下,臭氧催化氧化工艺对COD的去除率为67%,出水COD50mg/L。在中试实验期间,研究了臭氧催化氧化中试装置处理纺织染整综合废水使废水COD降至50mg/L以下的可行性和稳定性以及最佳工况;除此之外,还研究了臭氧催化氧化对色度、氨氮等指标的去除情况以及废水的可生化性改善情况。最后还对臭氧催化氧化处理印染废水的运行成本进行了计算。在中试实验过程中,结合小试实验的最佳反应条件以及高效澄清池出水的实际水质特点,在不调节进入中试装置的废水pH、温度的情况下,通过不断调试确定臭氧催化氧化中试的最佳反应条件为:臭氧投加量为150mg/L、水力停留时间为100min;臭氧催化氧化中试装置在最佳反应条件下,可以长时间并且稳定地实现出水COD"f50m g/L,色度"f30倍,满足《城镇污水处理厂污染物排放标准》(GB18918-2002)中的一级A标准;COD去除率为65%左右,色度去除率为70%左右,处理成本为每吨水2.6元。除此之外,高效澄清池出水经过臭氧催化氧化中试装置处理之后的出水可生化性改善程度小,仍然小于0.1;出水氨氮浓度基本都在4.2mg/L以下,去除率为10%左右。臭氧催化氧化中试研究成果为纺织染整综合废水深度处理提供了可供选用的技术以及设计参数。
[Abstract]:Textile printing and dyeing enterprises belong to high water consumption and high pollution enterprises. Since the promulgation and implementation of GB4287-2012, in response to the national task of reducing pollution in the 12th Five-Year Plan, it is necessary to carry out advanced treatment of textile dyeing and finishing wastewater in order to reduce the pollution load in key watersheds. To further remove pollutants from wastewater to meet the discharge standards and reduce the pollution load in key watersheds. The pilot study was carried out in a large wastewater treatment plant in a textile printing and dyeing industrial park in a city of Zhejiang Province. The effluent from an efficient clarifier was taken as the pilot study object. The advanced treatment methods of printing and dyeing wastewater, the influencing factors of ozone catalytic oxidation, the type of catalyst for catalytic ozone oxidation, the ozone system and the structure of ozone catalytic oxidation reactor are summarized. An advanced treatment process of textile dyeing and finishing wastewater by using metal ion supported catalyst to catalyze ozone oxidation was put forward. The factors affecting the treatment of printing and dyeing wastewater by ozone catalytic oxidation, such as ozone dosage, reaction time, HRT pH and so on, were studied in the laboratory of sewage treatment plant, the orthogonal experiment was designed and the results of orthogonal experiment were analyzed intuitively. The primary and secondary order of the factors affecting the catalytic oxidation of ozone and the optimal conditions for the catalytic oxidation of ozone in the laboratory were determined, and the optimum reaction conditions of catalytic oxidation of ozone were obtained after the experimental verification under the optimal conditions. The experimental results show that the optimum reaction conditions for catalytic ozonation are as follows: the dosage of ozone is 145 mg / L, the reaction time is 100 min and pH is 6.0. Under the optimum reaction conditions, the removal rate of COD by ozone catalytic oxidation process was 67%, and the effluent COD _ (50 mg / L) 路L ~ (-1). During the pilot experiment, the feasibility, stability and optimum conditions of treating textile dyeing and finishing wastewater by ozone catalytic oxidation pilot plant were studied. In addition, the effects of ozone catalytic oxidation on chroma were also studied. The removal of ammonia nitrogen and the improvement of the biodegradability of wastewater. Finally, the operating cost of ozone catalytic oxidation for printing and dyeing wastewater treatment was calculated. In the pilot-scale experiment process, combined with the optimum reaction conditions and the actual water quality characteristics of the high-efficiency clarifier, the pH and temperature of the wastewater entering the pilot plant were not adjusted. The optimum reaction conditions for the pilot-scale ozone catalytic oxidation were determined by continuous debugging: the dosage of ozone was 150 mg / L, the hydraulic retention time was 100 min, and the pilot plant of ozone catalytic oxidation was under the best reaction conditions. The effluent COD "f 50 mg / L, chroma" f 30 times can be achieved for a long time and can meet the first class A standard COD removal rate of about 65%, chromaticity removal rate about 70% and treatment cost 2.6 yuan per ton of water. In addition, the effluent biodegradability of high efficiency clarifier treated by ozonation catalytic oxidation pilot plant is less than 0.1, and the ammonia nitrogen concentration of effluent is below 4.2mg/L, the removal rate is about 10%. The results of the pilot study on ozonation and oxidation provide an alternative technology and design parameters for the advanced treatment of textile dyeing and finishing wastewater.
【学位授予单位】：华北水利水电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X791

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