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Ti-凹凸棒石催化剂对染料废水的臭氧氧化降解的影响 总被引:17,自引:1,他引:17
对于生物难降解性有机染料废水 ,用臭氧氧化法进行处理可取得较好的效果。氧化效率低 ,处理成本高是臭氧技术实际应用中的主要障碍。采用凹凸棒石为载体加载钛氧化物制成的可重复使用的固体催化剂 ,对人工模拟染料废水进行复合催化氧化处理 ,取得了较好的效果。在pH =11,人工合成染料废水浓度为 40 0mg·L- 1 的条件下 ,m(TiO2 )∶m(凹凸棒石 )为 1∶2 0的Ti-凹凸棒石催化剂使臭氧氧化效率 (以COD去除率计 )从 2 1.5 %提高到 73.8%。催化效果在碱性条件 ( pH =11)和低浓度废水 ( 40 0mg·L- 1 )时效果较好。重复使用 3次后 ,TiO2 流失率和COD去除率都较满意 相似文献
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活性炭载体下二氧化氯催化氧化直接大红染料废水研究 总被引:4,自引:0,他引:4
研究了二氧化氯化学氧化体系和二氧化氯催化氧化体系。实验结果表明:单用二氧化氯化学氧化处理COD为3400mg/L的直接大红染料配制废水时,最佳反应pH值为1,氧化剂经济用量为400mgClO2/L废水,反应时间为10min,COD去除率可达85.9%左右,氧化指数(COD削减量∶ClO2投加量)=7。当二氧化氯与自制催化剂所组成的催化氧化体系用于对直接大红染料配制废水的处理时,最佳反应pH值为2左右,氧化剂经济用量为600mgClO2/L废水,反应时间为10min,COD去除率可达99.2%以上,氧化指数=17。结果表明,二氧化氯催化氧化法是一种新型高效的处理难降解废水的技术,有着广阔的应用前景。 相似文献
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某化纤厂排放的二甲基亚砜废水不但恶臭大,而且COD值高,现有处理工艺由于引入大量新的污染物氯离子,且水中需保持较高的余氯,对后续生化系统影响较大。本文研究了多元催化氧化对该废水的处理效果,实验表明,经过多元催化氧化装置,废水中的COD值去除率在62%以上,且可生化性(B/C比)由0.18提高到了0.38,为后续进一步生... 相似文献
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二氧化氯催化氧化处理染料废水技术的研究 总被引:1,自引:0,他引:1
本文研究了二氧化氯化学氧化和二氧化氯催化氧化处理染料废水。实验结果表明单用二氧化氯化学氧化处理酸性大红染料配制废水时,最佳反应pH值为6~8,氧化剂经济用量为1000mg ClO2/L废水,反应时间为60min,COD去除率可达50%左右,氧化指数(COD削减量ClO2投加量)=2.3。当二氧化氯催化氧化酸性大红染料配制废水时,最佳反应pH值为2左右,氧化剂经济用量为800mg ClO2/L废水,反应时间为45~60min,COD去除率可达80%以上,氧化指数=3.5,去除每公斤COD氧化剂费用为3.7元人民币,并且废水的可生化性有很大的提高,效果明显优于二氧化氯化学氧化。 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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通过高锰酸钾法对南京部分地区的非饮用水的化学耗氧量(COD)进行了测定.实验结果表明,秦淮河下游的COD为6.879,秦淮河中游的COD为6.282,秦淮河上游的COD为6.395,玄武湖湖水的COD为4 390,长江的COD为2.259. 相似文献
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An empirical model for COD removal in a biological aerated filter (BAF) in the presence of 2,4,6-trinitrophenol (TNP) was developed, which related effluent COD to influent COD or hydraulic loading rate along the bed height. The overall reaction rate for substrate biodegradation could be described as pseudo first order. The experimental data of COD removal against reactor height were used to calculate the parameters in the empirical model. The COD concentration at different reactor height was expressed as a function of influent COD concentration and hydraulic loading rate, and , respectively, under the experimental condi-tion. The models may be used to predict the COD removal profiles along the reactor height at different hydraulic loading rates and influent COD concentration for design, selection and sizing of BAF. 相似文献
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Serdar Doǧruel Merve Köktuna Emine Ubay Çokgör Seval Sözen Derin Orhon 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2011,86(11):1364-1373
BACKGROUND: The study evaluated the relationship between particle size distribution (PSD) of chemical oxygen demand (COD) and treatability of leachate generated by organic waste. PSD determinations were performed together with physico‐chemical and biological treatability studies. Leachate biodegradation was also evaluated by means of oxygen uptake rate (OUR) profiles and experimental results were used for calibration of the adopted mathematical model. RESULTS: The leachate was characterized by a COD content of 80 000 mg L?1 in summer. PSD analysis showed a bimodal distribution with around 60% of the COD below 2 nm and 25% above 1600 nm. Chemical treatment by lime and alum provided limited COD removal (30‐35%). The extent of COD removal was higher than the particulate COD fraction above 1600 nm, it also occurred in the soluble range below 2 nm through adsorption. A modeling study indicated three major COD fractions that could be correlated with PSD analysis: readily biodegradable COD and slowly biodegradable COD in the soluble range and hydrolyzable COD fraction in the particulate range. CONCLUSION: PSD‐based COD fractionation adequately explained limitations of chemical treatment efficiency; it was also a reliable complement to the currently used respirometric tests for biodegradation, providing insight to the fate of different COD fractions included in the soluble range (<2 nm) and yielding concrete supporting information on the generation of soluble residual microbial products. Copyright © 2011 Society of Chemical Industry 相似文献
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Selda Murat Hocaoglu Güçlü Insel Emine Ubay Cokgor Ahmet Baban Derin Orhon 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2010,85(9):1241-1249
BACKGROUND: Household wastewater was segregated to grey and black water components as part of a recent approach aiming to separate wastewater fractions for more efficient treatment and reuse. Chemical oxygen demand (COD) fractionation and biodegradation characteristics of black and grey water were determined by means of model calibration of the oxygen uptake rate profiles. An ASM1 type of model modified for endogenous respiration was selected for this purpose. RESULTS: Calibration identified, aside from the readily biodegradable COD, two hydrolysable COD fractions in the black water, and only a single, slowly biodegradable COD fraction, in the grey water. The relative magnitude of the readily biodegradable COD fraction was high compared with typical domestic sewage, especially for grey water, and the level of particulate inert COD fraction, was relatively low. Biodegradation of soluble COD fractions in both wastewaters approximated typical rates observed for domestic sewage. However, the hydrolysis rate of the slowly biodegradable COD was quite low, reflecting the characteristics and impact of settleable organic matter. CONCLUSION: Based on the process rates obtained, aerobic biodegradation was equally effective for black and grey water fractions, both for the removal of soluble COD and the stabilization of particulate COD. Copyright © 2010 Society of Chemical Industry 相似文献
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采用电解絮凝-UASB-MBR组合工艺处理萘普生混合废水,研究结果表明,控制电压4.1 V,电解过程使COD在15 000 mg·L-1以上的废水,实现约20%左右的去除率,同时使废水的BOD有较大幅度的提高,增大了废水的可生化性;使聚铁混凝剂和PAM的投加浓度比为500:2,絮凝过程对COD约有20%的去除率;UASB单元对有机污染物有较大幅度地削减,去除率约75.8%~80%,将废水中的COD降至2 000 mg·L-1;而MBR单元则进一步将最终出水的COD降至100mg·L-1以下. 相似文献