排序方式: 共有36条查询结果,搜索用时 15 毫秒
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对采用蒸馏—铁炭微电解—吹脱工艺预处理实际乐果废水的效能进行了研究。保持工艺条件为:蒸馏温度为105℃,搅拌速度为100 r/min;铁炭微电解进水p H=3,铁炭质量比为1∶1,气水比为10∶1,反应时间为120 min;吹脱过程p H=11,温度为35℃,气液比为300∶1,吹脱时间为120 min。结果表明,工艺对废水的COD去除率达78.56%,TP的去除率达99.86%,TN、氨氮的去除率分别为93.91%、95.91%,B/C由0.08提高到0.32。采用蒸馏—铁炭微电解—吹脱对乐果废水预处理效果较好,有利于后期生化处理。 相似文献
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按照先回收再沺理的思路,采用两级回收工艺从合成乐果废水中回收甲醇和一甲胺,大幅度降低合成乐果废水中的COD、氨氮等污染物浓度,有利于废水后续生化处理,提高其可生化性。本工艺对废水中甲醇的回收率达到85%,对一甲胺的回收率达到90%,回收的副产物甲醇和一甲胺又用作乐果生产的原料,实现清洁生产的目的。 相似文献
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张志华 《精细石油化工进展》2008,9(10):38-40
利用次氯酸钠在酸性条件下生成的次氯酸代替Fenton试剂中的氧化剂H2O2,与Fe^2+共同作用对乐果模拟废水进行氧化处理。研究结果表明,此方法处理乐果废水的效果明显,在pH值为2、NaClO与FeSO4·7H2O的投加量分别为10mL/L和2.5g/L、振荡氧化30min的条件下,对初始浓度小于20mg/L的乐果废水,去除率大于90%,剩余乐果的浓度小于2mg/L,达到了我国废水综合排放的三级标准。 相似文献
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光催化降解有机磷农药的研究-玻璃弹簧负载TiO2与悬浮体系TiO2的比较 总被引:5,自引:2,他引:3
研究了利用玻璃弹簧填料为载体,采用浸涂烧结法制备负载型纳米TiO_2的过程、及其对有机磷农药敌百虫和乐果的光催化降解效果,并与单TiO_2粉末做了简单对比。结果表明:低浓度的两种有机磷农药,8W紫外灯照射2h时,无负载TiO_2对敌百虫和乐果的降解率分别为56.7%和68.6%;而玻璃弹簧负载TiO_2对二者的降解率分别为76.6%和88.7%;并且玻璃弹簧上负载的TiO_2光催化活性没有减弱,可以连续使用。同时还研究了改良型P25(P25/20)悬浮体系中的光催化降解效果,并展望了其在军事防化洗消领域中的应用前景。 相似文献
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气相色谱法测定水中六种有机磷农药和阿特拉津 总被引:2,自引:0,他引:2
介绍了用全自动固相萃取方法富集饮用水中有机磷农药和阿特拉津,并用毛细管气相色谱法进行定量测定的方法。水中敌敌畏、乐果、毒死蜱、对硫磷、甲基对硫磷、马拉硫磷等6种有机磷农药和阿特拉津经固相萃取小柱富集后,以甲基叔丁基醚,甲醇混合溶剂(V:V=90:10)洗脱定容后,用VarianCPSil8Lowbleed毛细管色谱柱分离,氮磷检测器(NPD)检测。该方法中7种有机磷标准曲线线性相关系数均大于99%;加标回收率在85%~105%范围内,相对标准偏差4.0%~10.0%;最低检测浓度在0.05-0.23μg/L,满足国家标准GB5749—2006的检测要求。 相似文献
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以悬浮态TiO2为光催化剂,在紫外光的照射下催化降解乐果,研究了乐果初始浓度、纳米TiO2添加量、反应体系温度、初始pH及通入空气等因素对乐果降解率的影响。结果表明,与反应体系温度和体系初始pH相比,纳米TiO2添加量和乐果初始浓度对乐果降解效果影响较大;不同流速空气通入均能使乐果降解率在0~20 min反应阶段有较大幅度的提高;当纳米TiO2添加量为0.1 g/L,乐果初始浓度为20 mg/L,反应体系温度为30℃,初始pH为6.5的条件下,再辅以空气(2.5 L/min)通入,反应60 min后,乐果降解率可达97.15%。 相似文献
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Reduction of diazinon and dimethoate in apple juice by pulsed electric field treatment 总被引:1,自引:0,他引:1
Zhang Y Hou Y Zhang Y Chen J Chen F Liao X Hu X 《Journal of the science of food and agriculture》2012,92(4):743-750
BACKGROUND: Organophosphorus pesticides (OPPs) are widely used in agricultural production in China, and residues of OPPs in agro‐products and foods have become a public health concern. Chronic exposure to OPPs can result in potential immunosuppressive effects, cytotoxicity and mutagenicity. Pulsed electric fields (PEFs) have the potential to be used as an alternative to conventional techniques of food production. The aim of the present study was to investigate the influence of PEFs on the degradation of diazinon and dimethoate added to apple juice. RESULTS: PEF treatment significantly promoted the degradation of both pesticides (P < 0.05). The extent of degradation was strongly influenced by the electric field strength and treatment time, and maximum degradation of both diazinon (47.6%) and dimethoate (34.7%) was achieved by treatment at 20 kV cm?1 for 260 µs. The degradation behaviour of the pesticides was described by Weibull and Hülsheger models, both of which successfully fitted the degradation of diazinon and dimethoate. In addition, the decline in the toxicity of samples was observed with a photobacterium bioassay. CONCLUSION: PEF treatment was effective in eliminating residues of diazinon and dimethoate spiked in apple juice and in mitigating sample toxicity. Copyright © 2011 Society of Chemical Industry 相似文献
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