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《化工科技》2016,(2)
为了考察"臭氧催化氧化法"深度处理综合化工污水厂二级生化出水的可行性,采用2套臭氧催化氧化中试装置,连续处理二级生化出水,考察了反应器内废水采用不同流向时,对COD去除效果和臭氧消耗运行成本的影响。结果表明:采用上向流运行方式,当臭氧投加量为43.3mg/L,进水COD为65.1~92.8mg/L,(平均值为79.9mg/L)时,出水COD为27.5~48.6mg/L(平均值为38.8mg/L),达到GB31571—2015直排标准(不超过50.0mg/L);采用上向流和下向流运行方式时,去除单位COD消耗臭氧量都为1.10g/g,所以废水流向对臭氧消耗运行成本无影响;采用臭氧催化氧化法能成功处理综合化工污水厂二级生化出水。 相似文献
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采用惠州石化含盐二级生化出水和深度处理出水作为原水分别进行深度处理。通过调整不同的停留时间、臭氧投加浓度进行试验。数据显示,惠州石化含盐二级生化出水经臭氧"接触氧化+催化氧化"处理后,COD去除率可达到39%~50%;采用含盐深度处理出水再次进行处理后,COD总去除率可达到40.72%。证明提高臭氧投加量和延长停留时间,含盐污水COD可以进一步降低。 相似文献
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对比了臭氧、臭氧催化氧化、臭氧/双氧水和臭氧/双氧水催化氧化4种工艺深度处理化工废水的效果,结果表明,当进水COD和色度分别为95.7 mg/L和90倍时,4种工艺出水的COD去除率分别为23.66%、26.77%、29.24%、32.97%,色度去除率分别为64.44%、64.44%、82.22%、82.22%,催化剂和双氧水均能小幅强化臭氧氧化效果。连续臭氧氧化可使出水COD降至20 mg/L,同时当臭氧投加量为60 mg/L时,4种工艺出水均具有一定的可生化性,满足后序生化工艺的需求。 相似文献
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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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某制膜企业污水处理厂二级生化出水的可生化性极低,难以达标排放。以其为原水,采用连续流动固定床反应器进行多相催化臭氧氧化试验,分别考察了吸附及催化性能、臭氧投加量、进气臭氧浓度、水力停留时间、床层高度对二级生化出水处理效果的影响。结果表明,采用多相催化臭氧氧化具有明显的处理效果,在臭氧质量浓度为30 g/m3、水力停留时间2 h、催化床层高度1 m的条件下,出水COD_(Cr)500 mg/L,可以达到北京市排入城镇污水处理厂标准要求。试验发现采用中间及底部分段进气时,可有效提高臭氧催化氧化效果。 相似文献
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污水经过长时间的生化处理后,大量易生化和可生化的有机污染物均大部分得到降解,而残留于水中的微量有机物却影响了污水的达标排放。这些残留于污水中的有机污染物采用进一步生物处理、物理吸附的方式都无法达到出水要求。在对臭氧氧化、芬顿催化氧化、MBR、BAF几种深度处理方式对比的基础上,确定深度处理工艺为反硝化滤池(DNBF)+曝气生物滤池(BAF)+高级氧化组合工艺。 相似文献
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印染废水经常规处理后,出水按照臭氧催化氧化和空塔氧化两种深度处理技术路线进行处理,以此对这两种印染废水深度处理技术进行效能和成本的评估与分析。结果表明两者均可使脱色达到排放标准。在投加臭氧催化剂的情况下,臭氧投加量为30ppm,其出水效果与空塔在臭氧投加量为40ppm时相当,节省了臭氧的消耗量,运行成本从0.45元/m^3下降到0.33元/m^3。每年可节省运行费用约105万元,增加臭氧催化剂的投资收回期小于2年。 相似文献
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A comparison between catalytic ozonation and activated carbon adsorption/ozone-regeneration processes for wastewater treatment 总被引:1,自引:0,他引:1
P.M. Alvrez F.J. Beltrn F.J. Masa J.P. Pocostales 《Applied catalysis. B, Environmental》2009,92(3-4):393-400
Two methods based on the use of granular activated carbon (GAC) and ozone to remove organic compounds from water have been investigated. Both methods have been applied to degrade an aqueous solution of gallic acid and a secondary effluent from a wastewater treatment plant (WWTP). One of the methods, namely catalytic ozonation, implies simultaneous ozonation and adsorption onto GAC. This process takes advantage of the oxidizing power of ozone and the adsorption capacity of GAC but also of the catalytic transformation of ozone into secondary oxidants on the GAC surface. The efficiency of catalytic ozonation was compared to those of single adsorption and single ozonation. It was found that the catalytic process highly improves the conversion of total organic carbon (TOC) and makes a more efficient use of ozone than the single ozonation process. To illustrate the reusability of the catalyst, the GAC was reused four times through a series of consecutive experiments. No loss of catalytic activity was observed when treating the WWTP effluent but some deactivation could be appreciated when treating the aqueous solution of gallic acid. This deactivation could be attributed to some porosity destruction and surface oxidation produced as a result of reactions of aqueous ozone on the GAC surface. The other method investigated is an adsorption-regeneration process (namely GAC/O3-regeneration) that comprises two steps: dynamic adsorption onto GAC and further regeneration of the spent GAC with gaseous ozone. The adsorption stage of the GAC/O3-regeneration experiments was carried out in a continuous flow adsorption column and breakthrough curves were obtained. It was observed that the GAC used in this work adsorbed gallic acid very efficiently but exhibited limited capacity to remove chemical oxygen demand (COD) from the WWTP effluent. The optimum ozone dose to regenerate the spent GAC after gallic acid adsorption was found to be about 0.4 g O3/g GAC, with results showing around 90% regeneration efficiency. As a result of incomplete regeneration, the GAC adsorption capacity progressively decreased with the number of adsorption–regeneration cycles. The GAC/O3-regeneration method was not successful at treating the WWTP effluent as low adsorption uptake was observed. Moreover, the GAC became damaged after regeneration because of excessive oxidation of its surface. 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