共查询到17条相似文献,搜索用时 125 毫秒
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机械式蒸汽再压缩技术(MVR),由于其高效节能的特点,在废水蒸发中应用越来越广泛。含氯化钠的废水经MVR蒸发后,浓缩液中氯离子质量分数10%,严重干扰采用重铬酸钾法测定化学需氧量(COD)。为了消除高含量氯离子对COD测定的干扰,在高氯废水中加入硫酸溶液,加热将其中的氯离子以氯化氢形式挥发,再测定COD。将某废水经MVR蒸发浓缩液(氯质量分数为13%)和加入硫酸溶液(体积分数为80%)到COD消解管中,并用COD消解装置加热除氯。结果表明,该方法能够将高氯废水中的氯离子去除至1 000mg/L,满足了重铬酸钾法测定COD标准检测方法对样品中氯离子含量的要求。采用该方法分别测定COD 100mg/L标样(氯质量分数为9%)、某废水MVR蒸发浓缩液样品(氯质量分数为13%)和MVR蒸发浓缩液经无害化处理后的样品(氯质量分数为8%)。结果表明,该方法具有良好的准确度和精密度,成功建立了氯离子质量分数为13%的高氯废水COD的快速测定方法。该方法直接利用COD消解装置进行氯离子去除,再进行快速密闭消解法测定COD,操作简单、快速。 相似文献
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文章阐述了采用重铬酸钾法和快速消解光度法测定COD的方法。要点是对试样事先测定氯离子质量浓度,再对试样预先进行银盐处理和排列分组,在测定过程同时加入掩蔽剂以消除氯离子的干扰。从测定结果看本公司酸洗处理后的废水为高氯低COD的废水,这一结果使文中论述的方法原理得到了验证。 相似文献
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高氯废水中化学需氧量的测定 总被引:7,自引:0,他引:7
针对高氯存在影响COD测定结果的现象,进行了高氯废水中COD测定的两种掩蔽方法、一种抑制方法及银柱方法除氯对比分析.通过实验验证确定用银柱法首先消除氯的干扰,再以国标重铬酸钾法测定COD值,具有准确度高、精密度高的特点,是较佳测定方案. 相似文献
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高氯废水COD测定方法的探究 总被引:3,自引:0,他引:3
探讨了用于高氯废水COD测定时消除氯离子影响的相关改进方法,认为对不同氯离子浓度和COD的水样可分别采用相应的方法.并对其中的分段测定法、氯耗氧曲线校正法进行了实验分析,得出氯离子质量浓度在2000~15000mg/L、COD<200mg/L时可用分段测定法;氯离子质量浓度在2000~20000 mg/L、COD>20... 相似文献
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Cl-会严重干扰高氯废水COD的测定结果,在COD测定过程中必须消除Cl-的干扰。文章从测定原理、消除效果及适用范围等方面对国内COD测定中采用的Cl-干扰消除方法进行了比较,指出对不同Cl-浓度和COD的水样应分别采用相应的消除方法。 相似文献
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粉煤灰氯化镁联合混凝吸附处理高浓度活性染料废水 总被引:2,自引:0,他引:2
利用粉煤灰和氯化镁的联合混凝吸附作用来处理高浓度活性染料废水.该法混凝吸附速度快,很快能得到澄清水样,在pH值等于11.0的条件下,对浓度高达1 g·L-1的活性艳红K-2BP模拟染料废水,脱色率和COD去除率均达96%以上. 相似文献
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以船舶废水为研究对象,采用双项预处理和CASS池处理组合工艺对其进行处理,重点考察了聚合氯化铝和聚合氯化铁用量对废水中的油相去除效果的影响,以及由高浓度COD和高盐度引起的活性污泥生物相演替规律。结果表明,当聚合氯化铝为0.25mg.L-1,聚合氯化铁的投量为2mg.L-1时对石油类的去除效果最好,此时石油类的浓度可降至22.71mg.L-1。CASS池能够在满负荷工况下实现稳定运行,出水COD、BOD和石油类分别为40~85mg.L-1,14~20 mg.L-1和4~6 mg.L-1时,对COD和石油类的去除率分别高达87%和98%以上。 相似文献
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某化纤厂排放的二甲基亚砜废水不但恶臭大,而且COD值高,现有处理工艺由于引入大量新的污染物氯离子,且水中需保持较高的余氯,对后续生化系统影响较大。本文研究了多元催化氧化对该废水的处理效果,实验表明,经过多元催化氧化装置,废水中的COD值去除率在62%以上,且可生化性(B/C比)由0.18提高到了0.38,为后续进一步生... 相似文献
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In this paper, applicability of ozonation combined with electrolysis as an advanced oxidation process for the removal of 1,4-dioxane from synthetic wastewater, has been studied. The combined process easily decomposed 1,4-dioxane, and two byproducts were detected in treated water. Although bicarbonate alkalinity was a strong radical scavenger, its influence was abated by air-stripping of carbon dioxide at the anodic compartment of the reactor. Free chlorine produced through anodic oxidation of chloride ion accelerated the COD removal from wastewater, despite the fact that this ion acted as a weak radical scavenger. The combined process was demonstrated to be applicable to the treatment of wastewater containing high concentration of bicarbonate alkalinity and chloride ions. 相似文献
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Treatment of tannery wastewater through the combination of a conventional activated sludge process and reverse osmosis with a plane membrane 总被引:1,自引:0,他引:1
Tannery wastewater contains high concentrations of organic matter (COD) with a significant percentage of refractory organic compounds, ammonium substances, salts (i.e. chloride and sulphate) as well as sulphur. Contaminants have to be removed in order to avoid significant environmental impacts. This paper presents the results obtained from a pilot scale study developed in the tannery district of Solofra in Southern Italy. It was aimed at evaluating the reuse of wastewater produced in the retanning process. The treatment process consisted of a biological treatment, as a pre-treatment, followed by a physico-chemical process (with a polymer as a coagulant) and reverse osmosis with a plane membrane. The biological pre-treatment was able to remove approx. 67% of COD, while the membrane system completed the purification process with the removal of the refractory organic compounds (chloride and sulphate). In the test carried out, the combination of a biological pre-treatment with a plane membrane system showed satisfactory results in terms of wastewater recovery and reuse in the tannery production cycle. 相似文献