共查询到19条相似文献,搜索用时 93 毫秒
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采用间歇式反应器考察了UV-H2O2高级氧化技术去除饮用水中二氯乙酸的效果及其影响因素,并进行了相关的动力学分析。结果表明,在紫外线辐照度为1048μW/cm^2、H2O2投加量为60mg/L、原水pH值为7.1、DOC浓度为5.13mg/L、二氯乙酸初始浓度约为100μg/L的条件下,UV-H2O2工艺对二氯乙酸的去除率〉90%。pH值为中性或偏酸性时,更有利于系统对二氯乙酸的去除;在其他条件一定的情况下,系统对二氯乙酸的去除效果随紫外线辐照度或H2O2投量的增加而增加,但当紫外线辐照度〉640μW/cm^2或H2O2投量〉40mg/L时,系统对二氯乙酸的去除率增加缓慢;在二氯乙酸初始浓度约为100μg/L及其他条件一定的情况下,当原水DOC浓度〈2.39mg/L时,180min内二氯乙酸即可被降解完毕;其他条件不变,当二氯乙酸的初始浓度〉109.48μg/L时,系统对二氯乙酸的去除率随其初始浓度的增加而变得非常缓慢。UV-H2O2工艺对二氯乙酸的降解符合一级反应动力学,UV与H2O2发生协同效应,使得在两者同时增加的情况下,反应速率常数大幅增加。 相似文献
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《Planning》2015,(5)
随着阿特拉津在我国大范围的应用,随之而来的环境污染也日趋严重,已经严重影响到我国粮食生产和农业经济的发展。本文综述了阿特拉津的危害,降解阿特拉津的微生物类群,及其降解特性、降解途径,展望了阿特拉津的生物降解趋势。 相似文献
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本文建立了气相色谱法同时检测水中阿特拉津和甲萘威,方法用乙酸乙酯进行萃取,浓缩后用丙酮定容进行气相色谱分析。结果表明水中阿特拉津和甲萘威的检出限分别为0.0001mg/L和0.001mg/L,加标回收率分别为98%~107%和91%~106%,相对标准偏差分别为2.3%~3.8%和2.8%~4.7%。该方法具有安全、快速、灵敏等特点,可用于水中阿特拉津和甲萘威的痕量检测。 相似文献
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模拟太湖水中阿特拉津浓度突增的情况,研究了臭氧氧化、生物活性炭吸附降解及臭氧/生物活性炭联用工艺对其去除效果,并初步分析了各工艺参数的影响.结果表明,单独臭氧氧化对阿特拉津的去除率约为31%,而生物活性炭工艺的去除率则可达到73%;臭氧氧化可强化生物活性炭对阿特拉津的去除效果,两者联用对阿特拉津的去除率高达95%;破碎炭上的生物量明显高于柱状炭,针对水中阿特拉津的去除,破碎炭更为适用;臭氧/生物活性炭工艺的炭层厚度建议采用150 cm,此值可在保证阿特拉津去除效果的同时,保障出水水质安全性. 相似文献
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固相萃取-高效液相色谱法测定水中阿特拉津 总被引:1,自引:0,他引:1
目的:探讨水中除草剂阿特拉津的检测方法。方法:利用固相萃取-高效液相色谱法对生活饮用水和地表水进行检测。过程以OASIS MCX富集柱对水样进行固相萃取,再经XTerra RP18色谱柱分离,在紫外检测器上进行检测。结论线性关系良好(在标准曲线0.50~10.00mg/L内,平均相关系数γ为0.9986),精密度较好(相对标准偏差为0.86%~4.47%),准确度、灵敏度较高(加标回收率为93.4%~101.6%,最低检出限为0.0003mg/L),是测定水中阿特拉津的较好方法. 相似文献
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为解决阿特拉津(ATZ)造成的水体污染问题,以三聚氰胺为前驱体,通过热聚合的方法成功制备了石墨相氮化碳(g-C3N4),并通过X射线衍射光谱(XRD)及扫描电子显微镜(SEM)对其结构及形貌进行了表征;同时探究了在可见光条件下g-C3N4与过二硫酸盐(PDS)耦合体系降解ATZ的效能。动力学研究证实,在可见光下g-C3N4与PDS具有明显的协同效应,其对ATZ的降解明显优于g-C3N4/Vis、PDS/Vis及g-C3N4/PMS(过一硫酸盐)/Vis体系。在优化实验参数的过程中发现,适度增加PDS的浓度和g-C3N4的用量、降低溶液的pH能有效促进ATZ的降解;但Cl-、CO32-/HCO3-、NO3 相似文献
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采用O3/H2O2体系降解内分泌干扰物类除草剂扑草净,并对氧化产物进行色谱分析,考察了该体系去除扑草净的效果。结果表明,当扑草净初始浓度为2 mg/L时,在H2O2/O3(物质的量之比)为0.7、O3投量为16.8 mg/L、温度为25℃、pH值为6.2的最佳条件下,O3/H2O2体系对扑草净的去除率接近93%;在自来水本底条件下,对扑草净的去除率较纯水中的高约9%;腐殖酸对扑草净降解的影响表现为低浓度促进、高浓度抑制,碳酸氢根对扑草净降解的抑制作用较小;伴随扑草净的降解,有硝酸根和硫酸根离子产生,这表明O3/H2O2体系能够有效降解扑草净。 相似文献
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活性炭吸附水中酚类内分泌干扰物试验研究 总被引:5,自引:0,他引:5
考察了两种不同表面化学性质粉末活性炭(WP及其改性炭WPN)对松花江原水和砂滤水中六种加标酚类内分泌干扰物的去除情况。试验结果表明,活性炭对六种目标物的吸附能力与其憎水性(logKOW)有关,依次为:4-n—NP〉E1〉DES〉EE2〉E2〉BPA;活性炭吸附降低了水中的TOC与UV254值,同时也去除了水中大部分的内分泌干扰物,WP和WPN两种活性炭对江水和砂滤水中六种目标物的去除率分别为26.82%~85.97%和74.62%~96.64%,其中WPN的吸附效果相对较好。试验结果还表明,活性炭对酚类内分泌干扰物的吸附能力受水中有机物与活性炭物化性质的影响较大,通过一定的改性处理获得孔结构与表面化学性质均有利于去除水中有机污染物的活性炭,并将其用于给水的深度处理,对于提高活性炭的吸附能力、使用寿命及确保出水水质安全都具有重要意义。 相似文献
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The degradation of PbEDTA in aqueous solution by a H(2)O(2)/UV process was studied. The effect of H(2)O(2) content, pH of the solution and the presence of nitrate were investigated. PbEDTA degradation by a H(2)O(2)/UV process was shown to be accompanied by simultaneous lead precipitation. PbEDTA was decomposed rapidly in acidic solutions while lead precipitation was achieved only when the pH of the solution was higher than 6. The presence of nitrate in significant amounts (0.04 M) inhibited remarkably the degradation of the complex and metal precipitation. The degradation of CdEDTA and ZnEDTA was also studied. It was found that the decomposition of metal-EDTA complex and metal removal by the H(2)O(2)/UV process depend greatly on the nature of the metal. CdEDTA and ZnEDTA were decomposed rapidly but metal precipitation was not achieved. The major by-products of the degradation of metal-EDTA complexes observed were nitrilotriacetic acid (NTA), iminodiacetic acid (IDA), oxalic acid and nitrate. 相似文献
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Paracetamol oxidation from aqueous solutions by means of ozonation and H2O2/UV system 总被引:5,自引:0,他引:5
Paracetamol oxidation from aqueous solutions is studied by means of ozonation and H(2)O(2) photolysis. Both oxidative systems are able to destroy the aromatic ring of the substrate with a partial conversion of the initial carbon content into carbon dioxide. For the adopted experimental conditions mineralization degrees up to 30% and 40% are observed with ozonation and H(2)O(2) photolysis, respectively. Main reaction intermediates and products are identified for both systems by HPLC and GC-MS analyses and a kinetic characterization is achieved. 相似文献
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本试验采用UV/H2O2光氧化法处理含有较高浓度阴离子表面活性剂(LAS)的洗浴废水,研究了H2O2投加量、pH值、光照时间、紫外灯光强对LAS降解率的影响,并得出了一些有益的结论。 相似文献
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《Water research》1996,30(7):1597-1604
Two advanced oxidation processes: the combinations of ozone and UV radiation, and hydrogen peroxide and UV radiation, have been used in the chemical degradation of protocatechuic acid, a phenolic pollutant present in the wastewaters from olive oil manufacturing. In the first case, the kinetic study is carried out by taking into account the contributions of the single ozonation and the photochemical reaction and applying the film theory model. The apparent kinetic constants and reaction orders for the combined reaction are deduced and correlated as a function of pH and temperature. In the second case, an empirical reaction rate expression which considers the contribution of both oxidants, UV radiation and hydrogen peroxide, is proposed. The kinetic rate constants for this combined reaction are also obtained and correlated as a function of temperature and pH. 相似文献
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采用UV/H2O2/微曝气、UV/H2O2、UV/微曝气、H2O2/微曝气四种工艺处理受苯胺污染的水源水.试验结果表明,采用UV/H2O2/微曝气工艺,H2O2投加量分别为1,2,5,10和20 mL,对苯胺均有理想的去除效果.随着投加量的增加,苯胺的去除率并没有明显的提高,反应30 min后去除率分别达到94.3%,96.4%,96.5%,97.3%和96.8%.原水苯胺为0.90 mg/L时,投加1 mL H2O2反应30 min后,出水苯胺为0.06 mg/L,满足标准要求.UV/H2O2/微曝气、UV/H2O2、UV/微曝气、H2O2/微曝气四种工艺对苯胺的去除率均随着时间的增长而提高,40 min后趋于平稳,最高去除率分别为97.9%,94.5%,64.27%和13.84%,UV/H2O2/微曝气、UV/H2O2出水苯胺均低于规定限值. 相似文献