共查询到18条相似文献,搜索用时 93 毫秒
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在我国煤化工技术及产业化快速发展进程中,煤化工废水处理技术始终处于相对落后的状态。煤化工废水作为一种成分多样、难以降解的有机废水,其中含有酚类、氨氮、焦油等众多污染物质,而其中酚类属于重点控制的污染物质。煤化工废水治理难度较大,对人体健康和生态环境带来严重危害,已成为许多地区首要污染源之一。基于此,首先阐述几种常见煤化工含酚废水,并探讨煤化工废水脱酚技术现状。 相似文献
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脱酚混合油作为废水脱酚萃取剂的研究 总被引:1,自引:0,他引:1
进行了从低温煤焦油的脱酚混合油中蒸馏切取不同馏分作为废水脱酚萃取剂的试验,结果表明,其分配比和萃取率均高于轻苯和洗油,为低温煤焦油的综合利用开发了新途径。 相似文献
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通过液膜法脱酚的多项实验,总结出废水的乳水比、处理时间、pH值、实验温度、NaOH的浓度等因素对脱酚效果的影响。 相似文献
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分析了煤化工含酚废水的来源及特征,介绍了几种酚类的测定方法,详细地阐述了煤化工废水脱酚技术的生化法、汽提法、萃取法、高级氧化法、吸附法等方法的内容、特点及应用前景,展望了煤化工废水脱酚技术的发展方向,萃取法和高级氧化法为未来煤化工废水脱酚技术的发展重点,且今后煤化工废水脱酚工艺应该是包括两种或两种以上脱酚方法的联合工艺... 相似文献
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磷的生物法去除很难达到污水排放标准,通常要结合化学絮凝的方法。因此,试验采用氯化钙、硅酸钠、聚丙烯酰胺对含磷废水进行处理,考察了氯化钙投加量、硅酸钠投加量、溶液pH值等因素对除磷效果的影响。结果表明,在一定条件下,磷去除效果较好,去除率可达99%。 相似文献
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煤气化含酚废水处理的达标排放一直是限制行业发展的一个瓶颈,萃取脱酚过程容易酚含量超标,而直接影响污水处理过程,为了准确模拟研究这一萃取过程,采用实际生产中的工艺参数和实验测定的水-二异丙基醚-苯酚-对苯二酚四元液液平衡数据,用Aspen软件对该过程进行了模拟,并对模拟参数进行了回归,得到了新的工艺模型。结果表明,新模型结果与实际数据误差在0.5%之内,非常准确;将模拟应用于指导工业生产,为实际生产操作和工艺改造提供了很好的技术支持。 相似文献
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Enda Miland Malcolm R. Smyth Ciarn
Fgin 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1996,67(3):227-236
Horseradish peroxidase (HRP) catalyses the oxidation of toxic aromatic compounds, especially phenols, in the presence of hydrogen peroxide. Reaction products polymerise to form insoluble precipitates which readily separate from aqueous solution, unlike their monomeric precursors. High-temperature phenol-containing gas liquors (produced from coal conversion processes) or effluent from bleach plants of kraft mills can substantially affect the stability of enzymes such as HRP and thus their oxidation capabilities. Apparent inactivation of peroxidase during high temperature polymerisation reactions is mainly due to unfolding of the protein backbone. The catalytic lifetime of HRP at high temperatures can be extended by chemical modification of lysine ε-amino groups using succinimides. The bifunctional, ethylene glycol bis-succinimidyl succinate (EG-NHS) and the monofunctional, acetic acid N-hydroxysuccinimide ester (AA-NHS) were used. The extent of stabilisation is dependent on the nature and concentration of the reagent used. The optimum pH for phenol removal is 9·0 (8·0 for 4-chlorophenol) for both native and modified forms of the enzyme; the optimum molar ratio of hydrogen peroxide and phenolic substrate is around 1·0. The effects of peroxide and enzyme concentration on the polymerisation reaction were investigated. HRP derivatives significantly reduced the oxidation reaction time at 70°C. 相似文献
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《分离科学与技术》2012,47(6):949-961
Abstract Resin regeneration is crucial in the feasibility of polyol purification by ion exchange. In order to get an economically viable commercial process, a new regeneration process, including initial and final methanol flushing steps and treating with a 4.5 M aqueous mineral acid solution, has been investigated. An important reduction in regeneration costs was reached by minimizing the amount of acid used and recycling one part of the regenerant solution to the process. The composition of regeneration effluents has been studied in order to recover their valuable components. This simple resin regeneration technique lends itself to a technically and economically viable commercial process for the treatment of polyol products. 相似文献
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