共查询到18条相似文献,搜索用时 234 毫秒
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《供水技术》2017,(3)
为了初步建立南水北调中线水源发生土臭素污染时的应对机制,通过向南水北调中线引江水中配入土臭素标准品,研究了臭氧氧化、粉末活性炭吸附以及二者联用对水中土臭素的去除效果。结果表明,对于500 ng/L左右的土臭素,臭氧氧化和粉末活性炭吸附均具有很好的去除效果。臭氧氧化去除水中土臭素的反应非常迅速,基本可在3 min左右完成,去除效果随着臭氧投加量的增大显著增强;粉末活性炭吸附去除水中土臭素的效果与其自身特性有关,且随着投加量的增大和吸附时间的延长逐渐增强;采用臭氧氧化与粉末活性炭吸附联用可以有效发挥二者的协同作用,在保证土臭素去除效果的同时减少臭氧或粉末活性炭投加量,提高产水水质的安全性。 相似文献
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粉末活性炭吸附去除松花江原水中有机物的研究 总被引:6,自引:1,他引:5
以松花江水为原水,通过小试和生产性试验研究了粉末活性炭吸附、混凝沉淀、过滤工艺对硝基苯及有机污染物的去除情况。结果表明:投加粉末活性炭很好地控制了有机物的总含量,混凝沉淀、过滤工艺主要使有机物的种类明显减少;投加粉末活性炭是去除环境优先控制有机物的关键措施;松花江水中的硝基苯投加量与检出量虽然存在一定的差异,但两者仍具有良好的线性关系;采用助凝措施强化粉末活性炭吸附去除水中硝基苯的效果不明显,说明硝基苯的去除主要是依靠粉末活性炭的吸附作用。 相似文献
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以合肥市某水厂生产时原水中二甲基异坎醇(2-MIB)超出《生活饮用水卫生标准》(GB 5749-2022)限值为研究对象,系统考察次氯酸钠预氧化、高锰酸钾预氧化、粉末活性炭吸附、高锰酸钾+粉末活性炭联用对2-MIB的去除效果。结果表明,次氯酸钠、高锰酸钾分别单独预氧化对2-MIB均有一定的去除效果,去除率分别为36%和63%,但过量投加均会导致去除率降低;粉末活性炭对2-MIB吸附去除效果好,去除率高达85%以上,但粉末活性投加量过大,吸附时间长,容易穿透滤池,出厂水浑浊度升高;而在高锰酸钾+粉末活性炭联用下,2-MIB的去除率高达90%以上,同时能大大减少活性炭的消耗量。 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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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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混凝沉淀/PAC吸附/超滤工艺处理引黄水库冬季原水 总被引:2,自引:1,他引:2
采用混凝沉淀/粉末活性炭吸附/超滤工艺(简称PAC-UF工艺)处理黄河下游引黄水库冬季原水,中试结果表明:当处理冬季低温低浊水时,聚合氯化铝的最佳投量为6 mg/L,粉末活性炭的最佳投量为20 mg/L;PAC-UF工艺可以将出水的浊度控制在0.1 NTU以下,去除率达98%以上;投加20 mg/L的粉末活性炭能使混凝沉淀/UF工艺对COD_(Mn)和UV_(254)的平均去除率分别提高12%和15%;同时,投加粉末活性炭还能够缓解超滤膜的不可逆污染,但缓解的程度有限. 相似文献
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饮用水水源突发性石油污染的应急处理方法研究 总被引:1,自引:0,他引:1
采用粉末活性炭(PAC)与ClO2组合技术对水源突发性石油污染进行了应急处理试验研究.结果表明,PAC+ClO2组合技术的除油效果明显优于采用单一处理方法.在ClO2和PAC的投量分别为8和30 ms/L,PAC吸附时间为3 h的条件下,该组合工艺可将水中0.5 mg/L石油类污染物降至0.01 mg/L,满足饮用水标准中0.05 mg/L的要求.在输水管渠中间的调压阀室投加PAC,可以充分利用管渠的流行混合时间;在水厂混合反应前投加ClO2进行预氧化较为适宜.PAC+ClO2组合技术可作为饮用水水源突发石油类污染的应急处理措施. 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
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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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考察了投加粉末活性炭吸附去除水中邻苯二甲酸二乙酯的可行性,并采用Freundlich公式拟合纯水和原水条件下的等温吸附方程。试验结果表明,采用粉末活性炭可有效去除水中邻苯二甲酸二乙酯,活性炭投加量为30mg/L,吸附120min后,纯水和原水条件下邻苯二甲酸二乙酯去除率分别为93.3%和89.3%。根据吸附等温方程计算得出,以邻苯二甲酸二乙酯的标准限值(0.3mg/L)为平衡浓度,纯水、原水条件下最大投炭量(80mg/L)可应对的邻苯二甲酸二乙酯最高质量浓度分别为7.575和5.731mg/L。 相似文献
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Removal of perfluorooctanoate from surface water by polyaluminium chloride coagulation 总被引:1,自引:0,他引:1
Perfluorooctanoate (PFOA) has been detected in surface water all over the world, and little is known of its removal by coagulation in water treatment plants. In this study, polyaluminium chloride (PACl) was used to remove PFOA from surface water, and the effects of coagulant dose, solution pH, temperature, and initial turbidity on the removal of both PFOA and suspended solids (SS) from water were investigated. Since the SS had high sorption affinity for PFOA, most PFOA was adsorbed on the particles and removed via the SS removal in the coagulation process. PFOA concentrations in aqueous phase decreased with increasing initial turbidity and PACl dose, while they increased with increasing solution pH and temperature. Other perfluorinated compounds (PFCs) with different C-F chain lengths and functional groups were also compared with PFOA. It was proved that hydrophobic interaction played an important role in the adsorption of PFOA on the SS. The addition of powdered activated carbon (PAC) before the coagulation process significantly enhanced the removal efficiency of PFOA in water, and the residual PFOA concentrations in water were less than 1 μg/L after the addition of 1-16 mg/L PAC and subsequent coagulation when the initial PFOA concentrations were in the range of 0.5-3 mg/L. 相似文献