共查询到14条相似文献,搜索用时 218 毫秒
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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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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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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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Pesticides removal from waste water by activated carbon prepared from waste rubber tire 总被引:1,自引:0,他引:1
Waste rubber tire has been used for the removal of pesticides from waste water by adsorption phenomenon. By applying successive chemical and thermal treatment, a basically cabonaceous adsorbent is prepared which has not only a higher mesopore, macropore content but also has a favorable surface chemistry. Presence of oxygen functional groups as evidenced by FTIR spectra along with excellent porous and surface properties were the driving force for good adsorption efficiency observed for the studied pesticides: methoxychlor, methyl parathion and atrazine. Batch adsorption studies revealed maximum adsorption of 112.0 mg g−1, 104.9 mg g−1 and 88.9 mg g−1 for methoxychlor, atrazine and methyl parathion respectively occurring at a contact time of 60 min at pH 2 from an initial pesticide concentration of 12 mg/L. These promising results were confirmed by column experiments; thereby establishing the practicality of the developed system. Effect of various operating parameters along with equilibrium, kinetic and thermodynamic studies reveal the efficacy of the adsorbent with a higher adsorption capacity than most other adsorbents. The adsorption equilibrium data obey Langmuir model and the kinetic data were well described by the pseudo-first-order model. Applicability of Bangham’s equation indicates that diffusion of pesticide molecules into pores of the adsorbent mainly controls the adsorption process. Spontaneous, exothermic and random characteristics of the process are confirmed by thermodynamic studies. The developed sorbent is inexpensive in comparison to commercial carbon and has a far better efficiency for pesticide removal than most other adsorbents reported in literature. 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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硫酸铁改性活性炭催化微波降解对硫磷的研究 总被引:5,自引:0,他引:5
在有硫酸铁改性活性炭存在下,微波照射能使溶液中的对硫磷(乙基1605)迅速降解.对于总体积为25 mL、浓度为30 mg/L的乙基1605溶液,在改性活性炭加入量为0.6g/L的条件下,经微波照射2.5min后降解率达100%.而同样条件下采用未改性活性炭作催化剂,尽管对乙基1605的降解率也为100%,但很大一部分是由活性炭的强吸附作用造成的.这表明,在微波照射下改性活性炭的催化活性明显高于未改性活性炭的.另外,采用紫外-可见光谱和离子色谱技术探讨了微波照射时间、乙基1605初始浓度、活性炭用量、硫酸铁溶液的浓度和酸度、乙基1605溶液的酸度和活性炭使用次数对改性活性炭催化微波降解乙基1605的影响. 相似文献
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针对邯郸市双水源供水体系,开展了预氧化强化混凝工艺处理南水北调-本地水库掺混源水试验。结果表明,单因素试验得到的PAC、次氯酸钠最佳投加量分别为5~15、0. 1~1. 0mg/L,慢速反应搅拌速度以60~100 r/min为宜;采用Box-Behnken法对单因素试验参数进行优化,并建立了响应值为叶绿素a和浊度去除率与PAC、次氯酸钠投加量及慢速反应搅拌速度的二次回归模型,通过Design-Expert软件得到的最优工艺参数如下:PAC投加量为11. 85 mg/L、次氯酸钠投加量为0. 88 mg/L、慢速反应搅拌速度为67 r/min,此时对叶绿素a和浊度去除率的预测值分别为93. 27%、90. 79%,与实测值93. 26%、90. 85%高度接近。 相似文献