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电化学高级氧化工艺降解有毒难生化有机废水 总被引:37,自引:0,他引:37
介绍了废水处理中高级氧化工艺的最新发展--电化学高级氧化工艺的几种典型形式及其原理,综述了该工艺的研究状况和在实际废水处理中的应用情况,展望了该工艺的可能发展和前景。 相似文献
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In this paper, the treatment of phenol-containing wastewater is studied by using UV/H 2O 2 system in a bench scale. The influence factors including concentration of H 2O 2 and phenol, pH, and some metal ions are investigated. The addition of H 2O 2 was favorable to the removal of phenol, however, the excess of H 2O 2 does not significantly affect the removal efficiency. It has shown that changes in reaction rates are rather insignificant over a wide pH range from 3 to 8. The co-existence of metal ions has significant influence upon the photocatalytic reaction rates, Fe 2+ increases the reaction rates, but Co 2O 3 and Zn 2+ given negative results. The mechanism of the reaction process is also discussed with chromatograms of phenol and its intermediate products. 相似文献
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催化氧化法降解废水过程 总被引:23,自引:1,他引:23
探讨了催化氧化过程,如O3/H2O2,Fenton试剂均相催化氧化;H2O2/UV,O3/UV光催化氧化;非均相湿式催化氧化,活性炭纤维电极法,非均相催化和生化氧化等过程处理废水及其应用。 相似文献
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利用CeO_2的储氧和释氧能力,以高活性的活性炭作为催化剂载体,采用等体积浸渍法制备CeO_2-活性炭催化剂。分别用氮气低温吸附/脱附、XRD、XPS对CeO_2-活性炭催化剂进行表征。以CeO_2-活性炭作为催化剂,草酸作为模型化合物,催化臭氧化降解草酸的去除率达到77%。Ce组分的加入能显著提高草酸的去除率。Ce不仅能够提高反应体系中羟基自由基的浓度,还有利于O3分子直接氧化草酸。CeO_2-活性炭催化剂经过3次重复使用后,草酸去除率保持在70%以上,具有较好的稳定性。 相似文献
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臭氧-活性炭工艺深度处理煤制气废水试验研究 总被引:4,自引:2,他引:4
以煤制气废水为研究对象,考察臭氧接触时间和臭氧通量对色度和UV254去除效果的影响,研究了臭氧-活性炭工艺在煤制气废水深度处理中的应用效果及影响因素。结果表明,与臭氧直接氧化相比,臭氧催化氧化对色度和UV254的去除效果显著提高,最佳臭氧接触时间为2 h,最佳臭氧通量为5 L/min,在此试验条件下连续运行该工艺深度处理煤化工废水,进水SS浓度和pH值对处理效果有较大影响,CODCr和色度去除率分别为89.95%和86.50%,出水CODCr的质量浓度小于30 mg/L,色度为30度,远优于GB 8978—1996《污水综合排放标准》中一级标准的要求,达到废水回用相关标准的要求。 相似文献
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Nan Bao Jian Sun Zhen‐Tao Wei Dong Ma Feng Liu Jin Wang 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2008,83(10):1347-1352
BACKGROUND: Furaltadone (FD), a nitrofuran derivative, is a highly effective chemotherapeutic drug. In China the FD wastewater discharged by the pharmaceutical industry is high in organics and biorefractory compounds. The objective of this study was to investigate the degradation mechanism of FD in aqueous solution by ozone oxidation. Preliminary results on the reaction mechanism were obtained using three different spectral analysis techniques. RESULTS: The ozonation mechanism was significantly affected by the pH value. At low pH values the primary reaction is direct oxidation of ozone, an incomplete oxidisation, which can only destroy the FD molecule's conjugated structure. At high pH values the major reaction changes to hydroxyl radical oxidation. FD can be rapidly oxidised into CO2, H2O, NH3, NO , HCHO, oxalic acid and other aliphatic acids of low molecular weight, which can be entirely mineralised by continued ozonation. CONCLUSION: The pH value significantly influences the mode of FD ozonation. The present experiment suggests a potentially useful pretreatment method for conventional biological treatment of wastewater containing FD. Copyright © 2008 Society of Chemical Industry 相似文献
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为提高纤维素乙醇废水厌氧出水的可生化性,采用臭氧氧化法对其进行强化处理,考察了反应时间、臭氧投加量、初始p H及反应温度对纤维素乙醇废水可生化性、COD和氨氮去除效果的影响。结果表明,在初始pH为8~10,臭氧投加量为5 g/h,反应时间为80 min,反应温度为30℃的最优条件下,出水COD为1 450 mg/L左右,COD去除率稳定在35%左右;出水氨氮为220 mg/L左右,氨氮去除率稳定在40%以上,出水BOD_5/COD由0.1提高到0.3左右,废水的可生化性得到较大程度的提高。 相似文献
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Apilot scale test of advanced treatment of ethene wastewater by ozonization was carried out for industrial water reuse. Effects
of different operating conditions on COD degradation, such as wastewater flow rate, ozonized gas flow rate, operating voltage
of ozonizer and two ozone generation means, using pure oxygen or air, was investigated. The results show that the increase
of ozonizer operating voltage, the decrease of wastewater flow rate and the suitable ozonized gas flowrate improve the removal
ofCOD inwastewater and thatozone generated respectively fromair and pure oxygen can effectively remove COD of ethene wastewater
to meet the industrial water reuse criterion. 相似文献
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采用臭氧化高级氧化技术对2,4-D(2,4-二氯苯氧乙酸)污染物进行降解,2,4-D降解过程中会产生含氯芳香中间产物、无氯芳香中间产物和有机酸类中间产物,其中部分中间产物具有较高毒性,因此研究2,4-D臭氧化过程中间产物的动力学变化趋势是非常重要的。提出了3种降解路径:一是简单的链式路径,二是平行式路径,三是复杂的交叉式路径。对反应过程中主要中间产物类的浓度变化趋势分别采用三种路径进行推导,得到3种不同的中间产物降解动力学模型,由模型计算数据和实验数据的拟合分析结果可知交叉式路径模型数据和实验数据的吻合度最好,交叉式路径所描述的主要中间产物模型数据和实验数据的相关系数都大于0.94。 相似文献
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通过臭氧氧化法处理酸性橙、直接嫩黄和直接玫红溶液模拟的印染废水,考察了反应时间、温度、pH、浓度等因素对处理效果的影响。结果表明,3种染料都随着pH的增加处理效果越好,在pH=13时,臭氧对酸性橙、直接嫩黄、直接玫红的去除率分别是90.9%,91.1%,89.7%;3种染料在浓度为500 mg/L时的去除率都比1 000 mg/L时候略大,说明在污染物处于低浓度下,臭氧氧化的效果更好;3种染料的最佳处理温度也都在35℃左右,温度对直接嫩黄和直接玫红的影响并不是很大,对酸性橙染料的去除效果影响较大。 相似文献
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实验研究了臭氧高级氧化-生化耦合技术处理低浓度有机污水。以某炼油厂乙烯废水为例,在低臭氧投加量1 5~2 0mg/L及其他一定条件下,出水CODCr平均不到33mg/L,石油类污染物平均去除率达到了67 2%,出水挥发酚最高质量浓度仅0 016mg/L,硫化物平均降解率为65 2%,氨氮去除率保持在87 9%以上,优于活性炭处理方法。实验还发现,低剂量臭氧投加量的影响不如废水流量及水质变化影响显著,前者既可提高有机物的可生化性,又不会对微生物产生抑制作用。 相似文献
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