共查询到15条相似文献,搜索用时 140 毫秒
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通过对粉末活性炭吸附特性的研究,探讨了活性炭工艺去除饮用水中甲基对硫磷和对硫磷有机磷农药的可行性。用Freundlich公式拟合吸附等温线的数据,并用来估算活性炭的吸附容量和最大投加量。试验结果表明,向甲基对硫磷、对硫磷浓度分别为0.22,0.06mg/L的配水中投加10mg/L粉末活性炭,吸附时间20min时两者的去除率为93.66%~98.11%。针对南方某水厂原水,试验所确定的活性炭最佳投加量为1.5~2.0mg/L。试验证明投加粉末活性炭是去除饮用水中甲基对硫磷和对硫磷的有效方法。 相似文献
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采用粉末活性炭吸附去除水中四氯化碳,考察了活性炭投加量、吸附时间、温度等因素对去除效果的影响.结果表明,该吸附过程符合Freundlich吸附等温线模式,以物理吸附为主,并且在纯水中的吸附容量大于原水;在15-25℃內,温度对吸附效果的影响不大,但去除率随吸附时间的延长而升高;投加80 mg/L粉末活性炭吸附120 m... 相似文献
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针对受毒死蜱污染的原水,通过小试研究了粉末活性炭(PAC)吸附强化聚合氯化铝混凝工艺对毒死蜱的去除效果。结果表明,单独投加8mg/L聚合氯化铝和0.05mg/LPAM难以将毒死蜱浓度降低至《生活饮用水卫生标准》的限值(0.03mg/L)要求,需要采用PAC吸附与混凝沉淀联用工艺。当原水毒死蜱浓度超标5,10,20,30,40和50倍时,所对应的粉末活性炭最佳投加量分别为20,30,30,40,40和50mg/L,出水浓度均小于0.03mg/L。PAC吸附强化工艺聚合氯化铝混凝工艺可有效应对原水的毒死蜱污染,保障供水安全。 相似文献
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应对突发氯苯污染的粉末炭吸附工艺实验研究 总被引:1,自引:0,他引:1
考察了模拟常规工艺对水中氯苯的去除效能,测定了粉末炭(PAC)对原水中氯苯的吸附等温线和吸附动力学曲线,并采用Freundlich吸附等温式和假二级动力学模型进行拟合.结果表明,常规工艺难以有效去除水中氯苯;PAC可快速地吸附水中氯苯,5min吸附量可达平衡吸附量的80%以上,30 min吸附量可达98%以上.建立了P... 相似文献
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粉末活性炭强化处理京杭运河常州段微污染原水 总被引:1,自引:0,他引:1
以京杭运河常州段微污染原水为研究对象,对其进行常规处理的同时增投粉末活性炭(PAC),通过静态吸附试验考察了最佳的投炭点和投加量.结果表明,投炭点在净水工艺流程中越靠前,则PAC对污染物的吸附效果越好;增投粉末活性炭可大幅度提高对有机污染物的去除效果;粉末活性炭的最佳投加点为吸水井,最佳投量为30 mg/L. 相似文献
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受典型除草剂污染原水的应急处理工艺研究 总被引:1,自引:0,他引:1
以水中阿特拉津和莠灭净浓度突增为背景,研究了混凝、PAC吸附和PAC吸附+混凝等工艺对它们的去除效率,同时根据原水水质的变化和水厂的常用工艺,分别考察了混凝剂投加量、pH值、预氧化对混凝去除阿特拉津和莠灭净的影响,以及目标物初始浓度、天然有机物浓度和预氧化对PAC吸附的影响。结果表明,调节pH值及采取预氧化措施均能改善混凝对阿特拉津和莠灭净的去除效果,但其出水浓度仍不能达标;天然有机物浓度对PAC吸附的影响并非是简单的线性关系,同时投加氧化剂和PAC会相互削弱其作用,PAC吸附+混凝才是去除阿特拉津和莠灭净最简单、有效的方法。 相似文献
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Natural organic matter (NOM) and pesticides removal using a combination of ion exchange resin and powdered activated carbon (PAC) 总被引:8,自引:0,他引:8
The combination of anion exchange resins (AERs) and powdered activated carbon (PAC) was studied to remove both natural organic matter (NOM) and pesticides. Experiments were conducted with high dissolved organic carbon (DOC) surface water (about 6.0mg DOC/L) spiked with both atrazine and isoproturon. AERs, like MIEX and IRA938, showed up to 75% removal of DOC after 30min contact time. The addition of PAC after treatment with these AERs only slightly decreased the residual DOC from 1.4 to 1.2mg/L. Experiments conducted with high (200microg/L) and low (1microg/L) initial pesticide concentrations showed that simultaneous and successive combinations of AER and PAC significantly improve the removal of both pesticides compared with PAC treatment on raw water. The improvement of short-term adsorption kinetics was explained by the adsorption of pesticides on AERs (about 5%) and the removal of high molecular weight (MW) NOM structures by AERs that reduce pore blockage phenomena. For 24h contact time with PAC (adsorption isotherms), the benefit of AER treatment was lower, which indicates that the refractory DOC to AER treatment still competes through direct site competition mechanism. MIEX resin had a distinct behavior since the simultaneous treatment with PAC showed no benefit on pesticide adsorption. The presence of fine residues of MIEX was shown to interfere with PAC adsorption. 相似文献