复合污泥基活性炭催化臭氧氧化降解水中罗丹明B

以污水处理厂生物污泥和化学污泥等为原料制备出复合污泥基活性炭(CAC),与纯生物污泥基活性炭(BAC)和商品活性炭(AC)对比,分别考察了吸附、催化臭氧氧化和自由基抑制剂存在时催化臭氧氧化对水中罗丹明B的去除效果,进而研究了p H和臭氧投加量对CAC催化效能的影响。结果表明,三种活性炭均能提高臭氧氧化降解罗丹明B的效率,CAC催化效能最好。CAC催化臭氧氧化罗丹明B的反应遵循羟基自由基机理,随着p H的增大和臭氧投加量增加,CAC催化效能得到提高。     

含炭高密度沉淀池/臭氧催化氧化工艺处理化工污水厂二级出水试验研究

本文研究了投加不同浓度粉末活性炭对高密度沉淀工艺和臭氧催化氧工艺处理某化工园区污水处理厂二级出水的影响。结果表明:投加粉末活性炭不影响高密度沉淀池对SS和TP的处理效果,但可以提高对COD的去除率,投加20、40、60、80mg/L时,COD去除率分别增加了9%、18%、20%和21%;当通入臭氧反应后,粉末活性炭投加量为20 mg/L时,臭氧催化氧化工艺的COD去除率增加了7%,而投加量大于20 mg/L,会降低臭氧催化氧化工艺的COD去除率。     

臭氧催化氧化-活性炭处理微污染源水

通过连续流试验比较了载锰颗粒活性炭催化臭氧氧化（催化氧化）与臭氧氧化及其后续活性炭过滤对微污染松花江水的处理效能。处理效率最高时,催化氧化对CODMn、UV254、DOC及三卤甲烷生成潜能的平均去除率分别为59.7%、75.8%、40.8%和42.4%,分别是臭氧氧化的3.6、1.4、5.0和2.8倍。随着时间的增加,催化氧化对有机物平均去除率下降,降低程度依次为：UV254〉CODMn〉DOC。催化氧化-活性炭工艺对水力负荷变化有较强的适应能力。臭氧氧化后水中氨氮浓度上升,而催化氧化后稍有下降,同时催化氧化后续活性炭对氨氮的平均去除率在80%左右,比臭氧氧化后续活性炭去除率高而且更加稳定。     

吸附-催化臭氧氧化去除印染废水中特征污染物

研究了活性炭吸附-催化臭氧氧化技术对印染废水特征污染物的去除效果,探讨了臭氧进气流量、活性炭投加量、pH对特征污染物去除效果的影响,并考察了活性炭-臭氧的协同作用。结果表明,苯乙酮被筛选为印染废水的特征污染物;活性炭吸附-催化臭氧氧化技术对苯乙酮的去除率随臭氧进气流量、活性炭投加量的增加而提高;臭氧进气流量50 mg/L、活性炭投加量200 mg/L、pH=10为最优工艺条件,反应20 min苯乙酮去除率即可达92.3%。     

臭氧氧化法强化处理纤维素乙醇废水研究

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。     

臭氧氧化-活性炭吸附法深度处理印钞废水

试验采用臭氧氧化-活性炭吸附法深度处理C市印钞厂污水处理站生化出水,分别探究了臭氧氧化过程中臭氧产量、氧化时间、p H和活性炭吸附过程中活性炭投加量、吸附时间、p H对COD去除率的影响。结果表明,按照本试验方法不调节原水p H,在臭氧产量为6.5 g/h(即体积分数为30%),氧化时间为30 min;活性炭投加量为1 g,吸附时间为60 min的条件下,深度处理出水可达标直排。     

金属氧化物催化臭氧氧化处理氨氮废水的研究

通过投加几种不用的金属氧化物催化臭氧氧化氨氮废水,比较出CuO催化氧化氨氮有较好的转化效果。分别考察了在不同pH值、催化剂投加量、初始浓度、臭氧投加量、温度的条件下,催化臭氧氧化氨氮废水的效果。在·OH和臭氧的共同作用下,碱性条件利于氨氮转化;CuO的投加量有最优值为10 g/L;初始浓度越高氨氮去除效果越低;臭氧投加量越大,氨氮去除越高;温度从常温提升至80℃,氨氮转化率得到明显的增加。     

微波-载铜活性炭催化氧化降解腐殖酸

以粉末活性炭(PAC)和颗粒活性炭(GAC)为载体,采用浸渍焙烧法制备了负载铜氧化物的活性炭催化剂,考察了其表面结构、元素组成及BET参数;以腐殖酸模拟废水为对象,研究了微波?载铜活性炭催化氧化降解腐殖酸的效果和影响因素,探讨了微波?催化氧化协同H2O2降解腐殖酸的机理. 结果表明,载铜活性炭比未负载铜的活性炭对腐殖酸的降解率更高,且Cu/PAC的催化效果远优于Cu/GAC,两种催化剂最佳的微波?催化氧化条件分别为Cu/PAC投加量1 g/L, H2O2投加量0.9 mL/L, pH=3,微波功率400 W,微波时间4 min和Cu/GAC投加量8 g/L, H2O2投加量1.5 mL/L, pH=6,微波功率400 W,微波时间4 min,该条件下腐殖酸的去除率分别为93.91%和91.59%. 微波、H2O2和催化剂协同作用对腐殖酸高效降解有决定性作用.     

吸附-催化臭氧氧化去除造纸废水中特征污染物的研究

研究了活性炭吸附-催化臭氧氧化去除造纸废水特征污染物,探讨了臭氧进气流量、活性炭投加量、pH等因素对吸附-催化臭氧氧化特征污染物的影响,并在最优化条件下,研究了渗氮活性炭对于吸附-催化臭氧技术的强化作用.结果表明,邻苯二甲酸二异丁酯被筛选为造纸废水的特征污染物:吸附-催化氧化联合工艺对DIBP的去除率随着O_3进气流量、GAC投加量、pH的增大而提高,比单独活性炭吸附、臭氧氧化高出9%和20%;以质量分数为8%的氨水浸泡所制的渗氮活性炭效能最好,吸附性能比原炭提高了10%,吸附-催化性能提高了13%.     

O_3/H_2O_2深度处理煤气化废水的实验研究

采用臭氧高级氧化技术对煤气化废水进行了处理,考察各影响因子对其处理效果的影响。实验结果表明:在反应时间为40 min、p H为8.78、臭氧和H2O2投加量分别为126.2、57 mg/L的条件下,废水COD降到44.9 mg/L,去除率达64.42%;色度降到6倍,去除率达99.00%;浊度降到0.34 NTU,去除率达68.81%;B/C由0.04提高到0.34。O3/H2O2技术处理效果优于单独臭氧氧化技术,且最佳p H有所降低。保持H2O2总投量相同,多次投加的去除效果明显优于一次性投加,且逐渐增大的投加方式下COD去除率最高。     

活性炭负载Fe~(3+)催化臭氧氧化水中双酚A

采用浸渍法在活性炭上负载铁制备催化剂Fe/AC,用于催化臭氧氧化水中内分泌干扰物双酚A(BPA),研究了Fe/AC/O3体系的协同效应,探讨了Fe/AC投加浓度、臭氧浓度和BPA初始浓度等工艺参数的作用规律,并分析了Fe/AC/O3体系在不同pH值下的催化反应机制。结果表明,在Fe/AC/O3体系下,反应60 min后,BPA和COD的去除率分别为97.44%和69.47%,效果明显优于臭氧体系的70.15%、30.89%和活性炭体系的14.69%、7.53%之和,具有明显的协同作用;Fe/AC/O3体系降解BPA符合一级反应动力学,当Fe/AC的投加浓度为5.0 g/L,臭氧浓度为15.0 mg/L,BPA初始浓度为50.0 mg/L时,Fe/AC/O3体系降解BPA的反应速率常数为0.05972 min-1;其反应机制受溶液pH值的影响,在酸性条件下是吸附和臭氧直接氧化共同作用,而在碱性条件下以·OH间接氧化为主,活性炭上负载的Fe3+促进了·OH的生成,大大提高了BPA的反应效率和矿化率。     

Effect of Catalytic Ozonation Coupling with Activated Carbon Adsorption on Organic Compounds Removal Treating RO Concentrate from Coal Gasification Wastewater

This paper reports a novel system of catalytic ozonation coupling with activated carbon adsorption for removing the organic compounds treating in the RO concentrate from coal gasification wastewater. The effect of ozone dosage, catalyst dosage, reaction time, influence pH, and temperature on organic compounds removal were examined for the processes. In the catalytic ozonation process, increasing solution pH, dosages ozone, and catalyst were statistically significant for improving the performance. In addition, the high salinity with chloride concentration of 15 g/L could reduce the catalyst specific surface area by 18%. Thus, high salinity showed negative influence on the catalytic effect in TOC removal. Regarding activated carbon adsorption process, modified activated carbon by NaOH revealed advantages in adsorbing organic compounds treating catalytic ozonation effluent. With the ozone dosage of 120 mg/L, catalyst dosage of 2.0 g/L, catalytic ozonation reaction time of 1 h, and modified activated carbon adsorption time of 1 h, the average TOC removal efficiencies were maintained at the stable level of 58% with the TOC concentration of 26 mg/L.     

碳酸钾改性油茶壳活性炭吸附水中氨氮的研究

利用所制备的油茶壳活性炭对水体中的氨氮进行了吸附,探讨了各因素对吸附效果的影响,并进行了吸附热力学和动力学分析。结果表明:活化温度及活化剂浓度的提高有利于油茶壳活性炭对氨氮的吸附。吸附过程在420 min左右达到平衡,符合准二级动力学模型。吸附过程符合Langmuir等温吸附模型,对氨氮的最大吸附量可达到10.83 mg/g。在最适的实验条件下,0.1 g的碳酸钾改性油茶壳活性炭对初始质量浓度为20 mg/L的氨氮废水中氨氮的去除率可以达到50.3%,吸附效果良好。     

Catalysts to improve the abatement of sulfamethoxazole and the resulting organic carbon in water during ozonation

Sulfamethoxazole (SMX), one pharmaceutical compound, has been treated in aqueous solutions with catalysts (copper and cobalt type perovskites and cobalt–alumina) and promoters (activated carbons). Hydrogen peroxide and saturated carboxylic acids were identified as intermediates. The effects of adsorption and pH have been investigated. Removal of the starting SMX accomplished with ozone alone is a fast process but catalytic or promoted ozonation is needed to significantly reduce the resulting organic carbon. SMX is, thus, mainly removed through direct ozone reaction while hydroxyl radical oxidation is the mechanism of removal the remaining TOC. The kinetics of the process has also been investigated. Perovskite catalytic ozonation resulted to be a chemical control process and apparent rate constants for homogeneous and heterogeneous ozonation were determined. For activated carbon ozonation, external diffusion of ozone to solid particles controlled the process rate.     

活性炭催化剂臭氧催化氧化处理废水的研究进展

介绍了近年来国内外活性炭催化剂臭氧催化氧化的研究结果,对活性炭及金属负载型活性炭催化剂的反应机理进行了总结。讨论了非均相臭氧催化氧化过程中活性炭的主要作用,活性炭催化剂的表面物化性质、pH值、温度在臭氧催化氧化过程中的影响规律。并提出活性炭催化剂的降解机理以及催化剂性质与有机污染物的化学结构之间的关系还需要进一步的研究。     

微气泡臭氧催化氧化深度处理化工园区废水研究

以酸/碱改性和Cu负载活性炭为催化剂,采用微气泡催化臭氧氧化深度处理化工园区废水。结果表明,经该工艺处理后,出水COD降至20 mg/L以下,发光抑制率降至-1.2%~-7.3%,B/C升至0.29~0.37,消除了废水生物毒性,并提高了废水可生化性。硝酸改性并负载Cu组分活性炭具有更强的催化活性,COD去除率和去除负荷分别可达70.8%和0.478 kg/(m~3·d),臭氧利用率为97.5%,催化臭氧氧化反应效率为0.554 mg COD/mgO_3。     

UV/O_3高级氧化工艺深度处理垃圾渗滤液的研究

采用UV/O_3高级氧化组合工艺对垃圾渗滤液二级出水进行深度处理。研究反应时间、p H和臭氧进气流量等因素对处理效果的影响。结果表明,最佳工艺条件是p H=9、臭氧进气流量80 L/h、紫外光功率为10 W、反应时间120 min。在最佳工艺条件下,UV/O_3高级氧化组合工艺对垃圾渗滤液二级出水COD、氨氮、色度的去除率分别为80.61%、64.47%、91.70%,相比单独臭氧处理时,去除率分别提高了19.31%、17.77%、6.10%。     

柚皮活性炭对氨氮吸附性能研究

采用氯化锌活化法制备柚皮活性炭,探讨其对废水中氨氮的吸附性能。结果表明,在pH为2～12,温度为30～50℃条件下,柚皮活性炭对氨氮均能取得较好的吸附效果;相同氨氮初始浓度条件下,随着投加量增加,单位质量柚皮活性炭对氨氮的吸附量明显减少;初始氨氮浓度越大,氨氮吸附量也越大。吸附数值遵循Henry及Freundlich等温吸附模型,吸附过程符合准二级动力学方程。     

Oxidation of Organic Pollutants of Water to Mineralization by Catalytic Ozonation

The oxidation of various organic compounds in aqueous solution was studied using catalytic ozonation (TOCCATA process) and conventional ozonation. The aim of the work is to assess catalytic ozonation efficiency for the mineralization of various organic compounds in order to envisage its application on real effluents. The selected organic compounds (about 30) are commonly found in industrial wastewaters. Comparative experiments were performed in batch mode at laboratory scale. Investigations were focused on ozone consumption rate, variations of total organic carbon, oxidation by-products and oxidation rate. Catalytic and conventional ozonation treatments were compared considering kinetic data, mineralization extent, and effect of organic functionalities. Catalytic ozonation system according to the TOCCATA process was able to convert organic compounds which were totally inert to ozone treatment and permitted considerably enhanced reaction rates when compounds were reactive to ozonation.