臭氧高级氧化技术处理乳化液生化尾水研究
发布时间：2018-07-17 03:46
【摘要】：乳化液废水是一种高浓度、难处理、风险大,排入环境会造成严重后果的危险废物,上海化工区某危废资源化处理企业通过物化-生化组合工艺集中处理乳化液废水,出水无法满足《上海市地方标准污水综合排放标准》(DB31/199-2009)规定的二级排放标准的要求,本文选用该企业乳化液生化尾水为研究对象,研究臭氧高级氧化及其联用技术,对其进行深度处理,通过小试研究探索单独03高级氧化工艺及03/H202联用高级氧化工艺对生化尾水有机物的处理效果及最优工况条件；并从处理出水有机物浓度、可生化性变化、有机成分组成变化等多角度比较两种高级氧化工艺；并初步确定适用于乳化液生化尾水处理的最优工艺。结果表明：两种高级氧化工艺对水中有机物和色度均有较好的去除效果,以CODcr、 TOC等作为评价指标,得出03高级氧化工艺和03/H202联用高级氧化工艺最优反应pH分别为7和11；最佳臭氧的出气流量均为0.5L/min,该流量条件下,臭氧投加速率分别为30mg/min和31mg/min; O3/H2O2联用高级氧化工艺中,n[H2O2]/n[O3]的最优投加摩尔比为0.5,H2O2的最优投加方式为间歇式投加；在各自最佳处理条件下,单独O3高级氧化工艺处理时间进行到300min时,出水CODcr、TOC浓度分别为200.6mg/L、103.6mg/L,仍未达到排放标准要求,处理效率不高,需进一步处理,而03/H202联用高级氧化工艺处理时间进行到120min时,出水CODcr、TOC浓度分别为82.3mg/L,28.7mg/L,已满足排放标准要求。从多角度分析比较单独O3高级氧化工艺和03/H202联用高级氧化工艺的结果可以看出,在一定的反应时间内,两种工艺出水pH随反应时间的变化规律不同,前者出水pH一直下降,pH总小于4,不在达标标准规定的范围内,而后者先下降后上升,pH在7-9之间,满足出水pH达标排放要求；在反应进行过程中,前者臭氧利用率要低于后者；两种高级氧化工艺都能在反应前期提高出水可生化性,但是后者对CODcr和BOD5的去除率都较高；前者出水中有机物成分以环烷烃、烯烃和羧酸类等分子量较大,成分复杂的有机物为主,后者出水有机物不论是分子量还是复杂程度都比前者小,出水有机成分以直链烷烃和小分子烯烃为主。从最优工况及多角度分析对比效果来看,03/H202联用高级氧化工艺优于单独03高级氧化工艺。通过O3/H2O2联用高级氧化工艺连续处理乳化液生化尾水,发现该技术广泛适用于该企业每日不同的乳化液生化尾水,03/H202联用高级氧化工艺在难处理有机物的深度处理领域有一定的突破,适用于乳化液生化尾水的深度处理。
[Abstract]:Emulsion wastewater is a kind of hazardous waste with high concentration, difficult treatment and high risk, which can cause serious consequences in the environment. A hazardous waste resource treatment enterprise in Shanghai chemical industry area can concentrate the emulsified wastewater through the physicochemical biochemical combination process. The effluent can not meet the standard of "the comprehensive discharge standard of Shanghai local standard sewage" (DB31/199-2009) two. In this paper, the biochemical tail water of the emulsion was selected as the research object. The advanced oxidation of ozone and its combined technology were studied. The treatment of the 03 advanced oxidation process and the advanced oxidation process of 03/H202 combined with the advanced oxidation process and the optimal conditions were studied. At the same time, two advanced oxidation processes were compared from various angles, such as the concentration of organic matter in the effluent, the changes of biodegradability and the composition of organic components, and the optimum process for the treatment of the biochemical tail water of the emulsion was preliminarily determined. The results showed that the two advanced oxidation processes had good removal effect on the organic matter and chromaticity in the water, with CODcr, TOC and so on. As the evaluation index, the optimal reaction pH of 03 advanced oxidation process and 03/H202 combined advanced oxidation process is 7 and 11, respectively, and the optimum ozone discharge flow is 0.5L/min. Under this flow rate, the acceleration rate of ozone is 30mg/min and 31mg/min respectively. In O3/H2O2 combined advanced oxidation process, the optimal dosage of n[H2O2]/n[O3] is 0.5, The optimal adding mode of H2O2 is batch adding; under the best treatment conditions of each O3, the effluent CODcr, TOC concentration is 200.6mg/L, 103.6mg/L, and the treatment efficiency is not high, the treatment efficiency is not high, and the treatment time of the advanced oxidation process is not high, while 03/H202 combined with advanced oxidation process treatment time. When 120min was carried out, the effluent CODcr and TOC concentration were 82.3mg/L, 28.7mg/L, respectively, which met the requirements of the emission standard. From the multi angle analysis, the results of the separate O3 advanced oxidation process and the advanced oxidation process of 03/H202 combined with 03/H202 can be found that the variation of the two process effluent pH with the reaction time is different in a certain reaction time. The former effluent P is p H has been decreasing, pH is less than 4, not within the range of standard standard, and the latter descends first and then rises, and pH is 7-9 to meet the discharge requirements of the effluent pH standard; in the process of the reaction, the former ozone utilization rate is lower than that of the latter; the two advanced oxidation processes can improve the biodegradability of the effluent at the early stage, but the latter is to CODcr and the latter. The removal rate of BOD5 is high. The organic compounds in the former are large in naphthenic, alkene and carboxylic acids, and the complex organic compounds are the main components. The organic matter in the effluent is smaller than the former, and the organic components in the effluent are mainly alkane and small molecular olefin. From the optimal conditions and multi angles. The analysis and contrast results show that the 03/H202 combined advanced oxidation process is superior to the single 03 advanced oxidation process. Through the O3/H2O2 combined advanced oxidation process, the biochemical tail water of the emulsion is continuously treated. It is found that the technology is widely applicable to the daily biochemical tail water of the emulsified liquid in this enterprise, and the advanced oxidation process of 03/H202 is used in the depth of the refractory organic matter. There is a breakthrough in the field of treatment, which is suitable for advanced treatment of emulsion biochemical tail water.
【学位授予单位】：华东师范大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X703
本文编号：2128864
[Abstract]:Emulsion wastewater is a kind of hazardous waste with high concentration, difficult treatment and high risk, which can cause serious consequences in the environment. A hazardous waste resource treatment enterprise in Shanghai chemical industry area can concentrate the emulsified wastewater through the physicochemical biochemical combination process. The effluent can not meet the standard of "the comprehensive discharge standard of Shanghai local standard sewage" (DB31/199-2009) two. In this paper, the biochemical tail water of the emulsion was selected as the research object. The advanced oxidation of ozone and its combined technology were studied. The treatment of the 03 advanced oxidation process and the advanced oxidation process of 03/H202 combined with the advanced oxidation process and the optimal conditions were studied. At the same time, two advanced oxidation processes were compared from various angles, such as the concentration of organic matter in the effluent, the changes of biodegradability and the composition of organic components, and the optimum process for the treatment of the biochemical tail water of the emulsion was preliminarily determined. The results showed that the two advanced oxidation processes had good removal effect on the organic matter and chromaticity in the water, with CODcr, TOC and so on. As the evaluation index, the optimal reaction pH of 03 advanced oxidation process and 03/H202 combined advanced oxidation process is 7 and 11, respectively, and the optimum ozone discharge flow is 0.5L/min. Under this flow rate, the acceleration rate of ozone is 30mg/min and 31mg/min respectively. In O3/H2O2 combined advanced oxidation process, the optimal dosage of n[H2O2]/n[O3] is 0.5, The optimal adding mode of H2O2 is batch adding; under the best treatment conditions of each O3, the effluent CODcr, TOC concentration is 200.6mg/L, 103.6mg/L, and the treatment efficiency is not high, the treatment efficiency is not high, and the treatment time of the advanced oxidation process is not high, while 03/H202 combined with advanced oxidation process treatment time. When 120min was carried out, the effluent CODcr and TOC concentration were 82.3mg/L, 28.7mg/L, respectively, which met the requirements of the emission standard. From the multi angle analysis, the results of the separate O3 advanced oxidation process and the advanced oxidation process of 03/H202 combined with 03/H202 can be found that the variation of the two process effluent pH with the reaction time is different in a certain reaction time. The former effluent P is p H has been decreasing, pH is less than 4, not within the range of standard standard, and the latter descends first and then rises, and pH is 7-9 to meet the discharge requirements of the effluent pH standard; in the process of the reaction, the former ozone utilization rate is lower than that of the latter; the two advanced oxidation processes can improve the biodegradability of the effluent at the early stage, but the latter is to CODcr and the latter. The removal rate of BOD5 is high. The organic compounds in the former are large in naphthenic, alkene and carboxylic acids, and the complex organic compounds are the main components. The organic matter in the effluent is smaller than the former, and the organic components in the effluent are mainly alkane and small molecular olefin. From the optimal conditions and multi angles. The analysis and contrast results show that the 03/H202 combined advanced oxidation process is superior to the single 03 advanced oxidation process. Through the O3/H2O2 combined advanced oxidation process, the biochemical tail water of the emulsion is continuously treated. It is found that the technology is widely applicable to the daily biochemical tail water of the emulsified liquid in this enterprise, and the advanced oxidation process of 03/H202 is used in the depth of the refractory organic matter. There is a breakthrough in the field of treatment, which is suitable for advanced treatment of emulsion biochemical tail water.
【学位授予单位】：华东师范大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X703
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