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催化臭氧氧化法作为一种高级氧化技术,在难生物降解有机废水的深度处理领域具有良好的应用前景。催化剂可以促进臭氧分解并生成活性自由基,增强有机污染物的降解速率和矿化程度,是影响催化臭氧氧化法效能的关键因素。文章阐述了均相和非均相催化臭氧法的反应机理,在此基础上梳理了近年来催化臭氧氧化工艺中常用催化剂的分类和研究进展,包括金属离子、金属氧化物、碳基材料、矿物质材料等,并对其在工业废水深度处理上的应用进行总结,探讨了该技术目前存在的问题,并展望了未来研究方向及应用前景,包括新型高效催化剂的制备、复杂难降解废水臭氧化预处理、二级生化处理出水的深度处理等。 相似文献
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《精细与专用化学品》2016,(10)
采用催化湿式氧化-生化组合工艺处理三氯吡啶生产废水,经小试考察,确定催化湿式氧化工艺最佳操作条件为:反应温度为250℃,反应压力为5.0MPa,催化剂投加量为1000mg/L。在上述条件下,三氯吡啶废水有机氮转化率80%,COD去除率60%,催化湿式氧化预处理后废水可生化性显著提高,经催化湿式氧化-生化组合工艺处理有利于达标排放。 相似文献
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高难废水指的是工矿企业生产产生的一种具有高盐、成分复杂、色度高、难生化降解及毒性大的难处理废水,对水体污染严重,处理成本极高。综述了国内外高难废水处理技术现状及存在问题,重点介绍了臭氧催化氧化技术、四相催化氧化技术、湿式氧化处理技术及水力空化协同臭氧氧化水处理技术的原理、特点及应用领域等。 相似文献
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湿式空气氧化技术的发展 总被引:1,自引:0,他引:1
催化湿式氧化法是一种处理高浓度、有毒有害、生物难以降解废水的方法,近年来在国内外都取得了快速的发展,文章论述了湿式氧化法和催化湿式氧化法的概念和发展,以及应用前景。 相似文献
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催化湿式氧化处理兰炭废水的工艺研究 总被引:2,自引:0,他引:2
采用催化湿式氧化(CWAO)技术处理陕北某兰炭生产企业的兰炭废水,考察了反应温度、氧气分压、进水pH及催化剂投加量等对兰炭废水处理效果的影响。结果表明:将自制CuO-MnO2-CeO2/γ-Al2O3催化剂用于CWAO处理兰炭废水时,随着反应温度、氧气分压、催化剂投加量的增大,CODcr去除率增大;在实验条件下,催化剂的最佳投加量为10g/L,最佳进水pH值=8;T=150℃、P(O2)=1.6MPa、反应120min后CODcr去除率可从湿式氧化的17.3%提高到77.8%。 相似文献
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湿式氧化技术已经成为处理高浓度难降解有机废水和污泥的有效手段之一。本文介绍湿式氧化催化剂发展状况及反应机理,重点介绍目前已实现工业化的各种湿式氧化技术,并展望湿式氧化技术的发展和应用前景。 相似文献
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废水高温深度氧化处理技术 总被引:9,自引:1,他引:8
介绍了多种废水高温深度氧化技术,包括湿式空气氧化技术、催化湿式氧化技术、湿式过氧化物氧化技术、超临界水氧化技术和焚烧技术,其中着重比较了焚烧技术中四种炉型的特点。 相似文献
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Emilia Otal Dionissios Mantzavinos Maria V. Delgado Rolf Hellenbrand Julian Lebrato Ian S. Metcalfe Andrew G. Livingston 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1997,70(2):147-156
The treatment of a model wastewater containing polyethylene glycol (PEG) of molecular weight 10000 in an integrated wet air oxidation–aerobic oxidation process was investigated. Partial wet air oxidation under mild operating conditions was capable of converting the original polymer to lower molecular weight compounds, such as oligomers and short-chain organic acids. The effect of molecular weight on the aerobic biodegradability of polyethylene glycol was assessed by performing shake flasks experiments with various polyethylene glycols in a molecular weight range from 200–35000 and it was found that biodegradability generally decreased with increasing molecular weight. Aqueous solutions of PEG 10000 were subjected to continuous wet air oxidation at a temperature of 423 K and a residence time of 30 min and the oxidised effluents were then subjected to subsequent continuous aerobic oxidation at residence times varying between 0·5 and 4 days. Simultaneously, continuous aerobic oxidation experiments on solutions of PEG 10000 were performed and used to compare the efficiency of the integrated treatment process with that of the direct biological treatment. Partial pretreatment by wet air oxidation under mild operating conditions resulted in effluents whose biodegradation rates were significantly higher than those of the original, unoxidised wastewater, as assessed by total organic carbon (TOC) removal rates. The original wastewater was practically non-biodegradable at a 0·5-day residence time with direct biological treatment, while an 80% TOC removal was achieved when biological treatment was coupled with a preceding wet air oxidation step. Conversely, with a 4-day residence time for the direct biological treatment the original wastewater was only partially degradable with 60–70% TOC removal recorded; with the integrated treatment process at a 4-day residence time in the bioreactor the overall TOC removal was greater than 90%. © 1997 SCI 相似文献