垃圾焚燒廠滲濾液生化出水臭氧氧化提高膜處理性能研究
發(fā)布時(shí)間：2018-10-08 16:58
【摘要】：垃圾焚燒發(fā)電廠滲濾液是一種烏黑發(fā)臭、組成復(fù)雜、有機(jī)污染物和氨氮含量高的廢水。滲濾液中含有的“三致”物質(zhì),若處理不當(dāng)會(huì)嚴(yán)重造成環(huán)境污染,從而危害人類的身體健康。實(shí)際運(yùn)行過程中,垃圾焚燒發(fā)電廠滲濾液處理技術(shù)要求較高,工業(yè)上通常采用生物法對垃圾滲濾液進(jìn)行預(yù)處理,由于預(yù)處理后的廢水COD、氨氮等含量仍較高,因此還需進(jìn)行深度處理。采用Ca(OH)2絮凝預(yù)處理生化出水,再經(jīng)O3氧化后,用于反滲透和納濾膜的深度處理工藝。結(jié)果表明,Ca(OH)2可以有效地預(yù)處理去除垃圾滲濾液生化出水中的腐殖酸類大分子有機(jī)物,Ca(OH)2可強(qiáng)化催化O3氧化處理預(yù)處理廢水中剩余的難降解小分子有機(jī)物,其機(jī)理可能是及時(shí)去除了反應(yīng)體系中生成的碳酸根離子。進(jìn)一步研究表明,滲濾液生化出水經(jīng)過Ca(OH)2絮凝處理,可以有效地去除其中的雜環(huán)類化合物,有利于提高廢水NF處理的膜通量。對Ca(OH)2絮凝出水進(jìn)行臭氧氧化處理,雖然降低了它的COD,但并未進(jìn)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類物質(zhì)造成了膜的污染;與RO(反滲透)膜處理垃圾滲濾液生化出水相比較,NF(納濾)膜無法分離廢水中的酮類、胺和酰胺類、雜環(huán)類化合物,使得NF產(chǎn)水的COD處在100~160 mg·L-1。NF平均膜通量的增大可導(dǎo)致產(chǎn)水COD略有上升;垃圾滲濾液生化出水及其預(yù)處理水在NF處理過程中,都沒有表現(xiàn)出嚴(yán)重的膜污染。但對RO處理過程來講,經(jīng)過O3處理過的電導(dǎo)最低絮凝出水,COD和廢水中的Ca2+和Mg2+離子濃度降到最低,其反滲透膜通量比生化出水的通量增高25~35%,膜污染明顯減輕。論文工作從石灰絮凝、O3氧化過程的工藝參數(shù)優(yōu)化,反滲透和納濾膜處理過程的性能和機(jī)理分析,探索了石灰絮凝+O3氧化+反滲透/納濾的組合工藝進(jìn)行垃圾滲濾液生化出水處理的可行性。對于城市垃圾焚燒技術(shù)的推廣應(yīng)用和復(fù)雜廢水的處理具有重要的參考價(jià)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.
【學(xué)位授予單位】：重慶理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X703
本文編號：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.
【學(xué)位授予單位】：重慶理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X703
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 李彥富;李玉春;董衛(wèi)江;;生活垃圾堆肥處理技術(shù)發(fā)展的幾點(diǎn)思考[J];中國資源綜合利用;2006年10期
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