共查询到20条相似文献,搜索用时 62 毫秒
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混凝沉淀-臭氧氧化深度处理皂素废水的实验研究 总被引:1,自引:0,他引:1
用混凝沉淀-臭氧氧化组合工艺对皂素生物处理出水的净化效果进行了研究。结果表明,YJD/PAM对皂素废水有较好的絮凝效果,臭氧氧化处理效果受废水pH、臭氧投加量、反应时间等因素的影响,实验的最佳反应条件为:废水pH值为11,臭氧投加量为1 500 mg/L,反应时间为20 min左右,此时出水COD和色度均达到国家排放标准。 相似文献
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臭氧氧化处理氰化废水的实验研究 总被引:1,自引:0,他引:1
采用臭氧氧化法处理金矿含氰废水,对臭氧投加量、pH值,催化剂等对除氰效果的影响进行了实验研究,研究结果表明,臭氧能够有效地去除金矿废水中的氰化物,臭氧投加量、pH值、Cu^2 对处理效果有一定影响。 相似文献
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以浸渍法制备金属复合催化剂Mn-Ti-Mg/Al2O3,采用SEM-EDS、XPS、BET对复合催化剂的表观形貌、原子组成、金属元素的存在状态、比表面积和平均孔径进行表征,并测定了其pHzpc。之后将其作为多相催化剂用于催化臭氧氧化处理煤化工废水,对其催化效果进行研究,考察了催化剂投加量、O3流速、溶液初始pH对其催化效能的影响,并对其稳定性进行了研究。结果表明,Mn-Ti-Mg/Al2O3复合催化剂对于催化臭氧氧化处理煤化工废水效果较好,催化剂投加量和臭氧流速的增加有利于提高煤化工废水COD的去除率,废水在碱性条件下更易被处理。经过催化臭氧氧化处理之后,废水的pH显著降低,导致催化剂中金属活性成分溶出,催化剂活性降低。在温度22℃、溶液初始pH 7.8、催化剂投加质量浓度10 g/L、臭氧流速1.0 mg/min、反应时间40 min条件下,采用Mn-Ti-Mg/Al2O3催化臭氧氧化处理煤化工废水,处理后废水... 相似文献
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UV/O3氧化处理磺化泥浆体系钻井废水 总被引:1,自引:0,他引:1
用紫外光催化-臭氧(UV/O3)氧化处理磺化泥浆体系钻井废水,考察了pH、初始COD、臭氧投加量等因素的影响.结果表明:由于钻井废水中含有羟基自由基可清除碳酸氢根离子,所以钻井废水UV/O3氧化在pH为3.0时的效果好于中性和碱性条件;初始浓度的降低和臭氧投加量的增多均可提高UV/O3氧化去除钻井废水COD的速率,但是随着臭氧投加量的增多,相应的臭氧指数(OI)显著增大.当臭氧投加量为810 mg/h时,氧化60min COD可从647mg/L降至96mg/L,但臭氧指数高达4.52,显得并不经济.由于UV/O3氧化可大大提高钻井废水的可生化性,所以可以先用UV/O3预氧化钻井废水,然后再用生物法处理,这样可大幅降低处理费用. 相似文献
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介绍处理生物难降解有机物的各种深度氧化处理技术——光化学催化氧化、湿式催化氧化、超临界水氧化、电解氧化及其他深度氧化技术,阐述了各种技术的机理及研究进展,探讨了各项技术发展的前景与趋势。 相似文献
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April Russell 《Catalysis Reviews》2013,55(4):337-423
The diesel oxidation catalyst (DOC) has been part of diesel exhaust systems since regulations were introduced to limit the amount of harmful emissions released to the environment from diesel engines. The DOC primary functions are oxidation of CO, unburned hydrocarbons, and NO, while active hydrocarbon oxidation can also be used to generate exotherms required for downstream components. This review will describe work that has attempted to understand the reactions, both desired and undesired, that occur over the catalyst. First, the history, configuration, and components of the DOC will be discussed, followed by in-depth coverage of the fundamental reactions that occur over a DOC, including reaction mechanisms, reaction inhibition, and other reactivity effects. Finally, DOC deactivation mechanisms and their effects on the DOC are described. While there is a lot of research literature regarding Pt- and Pd-based catalysts for many different reaction schemes, this review tries to highlight work most relevant to DOC applications. 相似文献
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生物难降解有机污染物废水深度氧化治理技术进展 总被引:6,自引:0,他引:6
本文综述了处理废水中生物难降解有机污染物的深度氧化技术—湿式空气氧化法、超,临界水氧化法、复合空气氧化法、光化学氧化法及其相应的催化氧化法,评论这些方法的特点及应用前景有38篇参考文献。 相似文献
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Selective oxidation with air on metal catalysts 总被引:5,自引:0,他引:5
Pierre Gallezot 《Catalysis Today》1997,37(4):40-418
Oxidation of organic molecules with air on metal catalysts has been known for a long time but there has been a renewed interest in recent years because these catalytic reactions are environmentally safe and could replace stoichiometric oxidations. This paper describes several oxidation reactions conducted either at high temperatures in the gas phase or at moderate temperatures in the liquid phase; in both cases they proceed via a mechanism of oxidative dehydrogenation on the metal surface. Ethylene glycol was converted to glyoxal at 550°C on Ag/SiC catalyst with a 70% yield provided promoters were added to the reaction feed (diethylphosphite or iodine) or deposited on the catalyst (LiPO4 or H3PO4). The promoters improve the conversion and selectivity by modifying the structure and the oxygen concentration on the surface of silver. Oxidation of glyoxal to glyoxylic acid, glucose to gluconic acid and glycerol to various oxygenated derivatives were conducted in water at 60°C in the presence of carbon-supported palladium or platinum catalysts. Bismuth promoter, deposited on the platinum metals by redox reaction, improves the catalyst activity by preventing over-oxidation of the metal surface and favors the oxidation of secondary alcohol functions into keto-derivatives. At higher reaction temperatures, platinum catalysts produce C-C bond rupture with the formation of carboxylic acids with smaller chains. Thus, cyclohexanol was converted into C6, C5, and C4 diacids with a 45% selectivity to adipic acid on Pt/C catalysts at 150°C. 相似文献
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结合催化湿式氧化法和电催化氧化法为水热电催化氧化法处理高浓度苯酚模拟废水((ρCOD)为7500mg/L):以C/Ru作催化剂(w(Ru)为0.5%),自制DSA阳极(釜体为阴极),加入NaCl作支持电解质(w(NaCl)为1%),充入氧气使PO2为3.5MPa,升温至设定温度后:开初0.5h进行苯酚的催化湿式氧化,后0.5h进行电催化氧化,并改变条件进行苯酚的单一催化湿式氧化和电催化氧化。结果表明:85℃时水热电催化氧化条件下,苯酚去除率为100%,COD去除率达92.34%,而单一催化湿式氧化和电催化氧化的COD去除率却依次为68.46%、39.73%,可见水热电催化氧化法利用了催化湿式氧化法和电催化氧化法的协同作用,取得了更佳的效果。该方法是一种新型、低温、高效的废水处理技术,为处理苯酚废水提供了另一种可能途径。 相似文献
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