垃圾焚烧厂渗滤液生化出水臭氧氧化提高膜处理性能研究
发布时间：2018-10-08 16:58
【摘要】：垃圾焚烧发电厂渗滤液是一种乌黑发臭、组成复杂、有机污染物和氨氮含量高的废水。渗滤液中含有的“三致”物质,若处理不当会严重造成环境污染,从而危害人类的身体健康。实际运行过程中,垃圾焚烧发电厂渗滤液处理技术要求较高,工业上通常采用生物法对垃圾渗滤液进行预处理,由于预处理后的废水COD、氨氮等含量仍较高,因此还需进行深度处理。采用Ca(OH)2絮凝预处理生化出水,再经O3氧化后,用于反渗透和纳滤膜的深度处理工艺。结果表明,Ca(OH)2可以有效地预处理去除垃圾渗滤液生化出水中的腐殖酸类大分子有机物,Ca(OH)2可强化催化O3氧化处理预处理废水中剩余的难降解小分子有机物,其机理可能是及时去除了反应体系中生成的碳酸根离子。进一步研究表明,渗滤液生化出水经过Ca(OH)2絮凝处理,可以有效地去除其中的杂环类化合物,有利于提高废水NF处理的膜通量。对Ca(OH)2絮凝出水进行臭氧氧化处理,虽然降低了它的COD,但并未进一步提高其NF膜通量,其主要原因可能是臭氧氧化生成的硅氧烷类物质造成了膜的污染;与RO(反渗透)膜处理垃圾渗滤液生化出水相比较,NF(纳滤)膜无法分离废水中的酮类、胺和酰胺类、杂环类化合物,使得NF产水的COD处在100~160 mg·L-1。NF平均膜通量的增大可导致产水COD略有上升;垃圾渗滤液生化出水及其预处理水在NF处理过程中,都没有表现出严重的膜污染。但对RO处理过程来讲,经过O3处理过的电导最低絮凝出水,COD和废水中的Ca2+和Mg2+离子浓度降到最低,其反渗透膜通量比生化出水的通量增高25~35%,膜污染明显减轻。论文工作从石灰絮凝、O3氧化过程的工艺参数优化,反渗透和纳滤膜处理过程的性能和机理分析,探索了石灰絮凝+O3氧化+反渗透/纳滤的组合工艺进行垃圾渗滤液生化出水处理的可行性。对于城市垃圾焚烧技术的推广应用和复杂废水的处理具有重要的参考价值。
[Abstract]:Leachate from waste incineration power plant is a kind of wastewater with black smelly, complex composition and high content of organic pollutants and ammonia nitrogen. If the leachate is not treated properly, it will seriously pollute the environment and endanger human health. In the actual operation process, the leachate treatment technology of the waste incineration power plant is very high. The biological method is usually used to pretreat the landfill leachate in industry, because the COD, ammonia nitrogen content of the wastewater after pretreatment is still relatively high. Therefore, further processing is needed. The biochemical effluent was pretreated by Ca (OH) _ 2 flocculation and then oxidized by O _ 3. It was used in the advanced treatment process of reverse osmosis and nanofiltration membrane. The results showed that Ca (OH) 2 could effectively pretreat the humic acid macromolecular organic matter (Ca (OH) 2) in the biochemical effluent of landfill leachate, which could enhance the catalytic ozone oxidation treatment of the residual small molecular organic compounds in the pretreatment wastewater. The mechanism may be the removal of carbonate ions from the reaction system in time. The further study shows that Ca (OH) _ 2 flocculation can effectively remove the heterocyclic compounds in the biochemical effluent of leachate, which is beneficial to increase the membrane flux of wastewater treated with NF. The Ca (OH) _ 2 flocculant effluent was treated by ozone oxidation, although its COD, was reduced, but its NF membrane flux was not further improved. The main reason may be that the silicanes produced by ozone oxidation cause membrane fouling. Compared with RO (reverse osmosis) membrane treatment of landfill leachate, NF (NF) membrane can not separate ketones, amines, amides, heterocyclic compounds from wastewater. The increase of the average membrane flux of COD produced by NF at 100 ~ 160 mg L-1.NF could lead to a slight increase of COD, and no serious membrane fouling was observed in the biochemical effluent from landfill leachate and its pretreatment water during NF treatment. But in the process of RO treatment, the concentration of Ca2 and Mg2 in the effluent treated by O3 and the concentration of Ca2 and Mg2 in wastewater decreased to the lowest, and the flux of reverse osmosis membrane increased 2535% than that of biochemical effluent, and the membrane fouling was obviously reduced. In this paper, the optimization of process parameters in the process of lime flocculation and ozone oxidation, the performance and mechanism of reverse osmosis and nanofiltration membrane treatment are analyzed. The feasibility of biochemical effluent treatment of landfill leachate by combined process of lime flocculating O3 oxidation reverse osmosis / nanofiltration was explored. It has important reference value for the popularization and application of municipal solid waste incineration technology and the treatment of complex wastewater.
【学位授予单位】：重庆理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703
本文编号：2257548
[Abstract]:Leachate from waste incineration power plant is a kind of wastewater with black smelly, complex composition and high content of organic pollutants and ammonia nitrogen. If the leachate is not treated properly, it will seriously pollute the environment and endanger human health. In the actual operation process, the leachate treatment technology of the waste incineration power plant is very high. The biological method is usually used to pretreat the landfill leachate in industry, because the COD, ammonia nitrogen content of the wastewater after pretreatment is still relatively high. Therefore, further processing is needed. The biochemical effluent was pretreated by Ca (OH) _ 2 flocculation and then oxidized by O _ 3. It was used in the advanced treatment process of reverse osmosis and nanofiltration membrane. The results showed that Ca (OH) 2 could effectively pretreat the humic acid macromolecular organic matter (Ca (OH) 2) in the biochemical effluent of landfill leachate, which could enhance the catalytic ozone oxidation treatment of the residual small molecular organic compounds in the pretreatment wastewater. The mechanism may be the removal of carbonate ions from the reaction system in time. The further study shows that Ca (OH) _ 2 flocculation can effectively remove the heterocyclic compounds in the biochemical effluent of leachate, which is beneficial to increase the membrane flux of wastewater treated with NF. The Ca (OH) _ 2 flocculant effluent was treated by ozone oxidation, although its COD, was reduced, but its NF membrane flux was not further improved. The main reason may be that the silicanes produced by ozone oxidation cause membrane fouling. Compared with RO (reverse osmosis) membrane treatment of landfill leachate, NF (NF) membrane can not separate ketones, amines, amides, heterocyclic compounds from wastewater. The increase of the average membrane flux of COD produced by NF at 100 ~ 160 mg L-1.NF could lead to a slight increase of COD, and no serious membrane fouling was observed in the biochemical effluent from landfill leachate and its pretreatment water during NF treatment. But in the process of RO treatment, the concentration of Ca2 and Mg2 in the effluent treated by O3 and the concentration of Ca2 and Mg2 in wastewater decreased to the lowest, and the flux of reverse osmosis membrane increased 2535% than that of biochemical effluent, and the membrane fouling was obviously reduced. In this paper, the optimization of process parameters in the process of lime flocculation and ozone oxidation, the performance and mechanism of reverse osmosis and nanofiltration membrane treatment are analyzed. The feasibility of biochemical effluent treatment of landfill leachate by combined process of lime flocculating O3 oxidation reverse osmosis / nanofiltration was explored. It has important reference value for the popularization and application of municipal solid waste incineration technology and the treatment of complex wastewater.
【学位授予单位】：重庆理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703
【参考文献】
相关期刊论文 前1条
1 李彦富;李玉春;董卫江;;生活垃圾堆肥处理技术发展的几点思考[J];中国资源综合利用;2006年10期
，本文编号：2257548
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