共查询到18条相似文献,搜索用时 125 毫秒
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催化消解密封法测定工业废水中的化学需氧量 总被引:2,自引:0,他引:2
介绍了用催化消解密封法测定工业废水中化学需氧量的过程,与经典重铬酸钾法比较,此法缩短了消解时间,测定化学需氧量(COD)值范围广,更适合测定化学需氧量较低的地表水和高氯工业废水。 相似文献
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电石渣浆清液中COD主要成分的探讨 总被引:1,自引:0,他引:1
渣浆中化学需氧量(COD)的主要成分为溶解于其中的乙炔(C2H2)和硫离子(S∧2-),经渣浆池沉淀曝气后,C2H2因不断向大气扩散而浓度降低;S∧2-在强碱性的条件下稳定存在,因此溢流清液中的COD主要由S∧2-造成,提出脱硫将成为降低COD的首要问题。 相似文献
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污水处理是一个复杂的非线性过程,化学需氧量(chemical oxygen demand,COD)是评价污水处理效果的关键指标之一。COD的传统测量方法耗时长、成本高,基于传统神经网络的软测量方法提高了COD参数的测量速度但精度较差。针对这些问题,设计一种结合自组织特征映射 (self-organizing map, SOM)和径向基函数(radial basis function, RBF)神经网络的COD参数软测量方法。该方法利用SOM网络聚类数据样本,根据所得聚类结果确定RBF网络的隐层节点数及节点的数据中心,综合提高RBF网络的收敛速度和拟合精度。利用污水处理厂部分水样数据建立COD软测量模型,模型仿真和硬件在线测试结果表明,相对于传统的BP、RBF等网络,基于SOM-RBF神经网络的COD软测量方法测量时间短、预测精度较高,具有较为广阔的应用前景。 相似文献
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对于污水,我国规定用重铬酸钾法,其测得的值称为化学需氧量(COD)。传统的方法是在强酸性溶液中,用一定量的重铬酸钾氧化水中还原性物质,过量的重铬酸钾以试亚铁灵作指示剂,用硫酸亚铁铵溶液回滴。根据硫酸亚铁铵的用量算出水样还原性物质消耗氧的量,这就是重铬酸钾回流滴定法。在污水厂化验室,面对大量水样的COD测量,使用该方法会耗费化验员大量的操作时间。而利用重铬酸钾分光光度法进行COD测量,能使化验员轻松地面对大量水样的分析。 相似文献
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为了监测湘潭地区水体受有机物污染程度,采用酸性高锰酸钾法对该地区地表水中化学需氧量数值进行了检测分析。对比近两年来各断面的年平均化学需氧量数值,各断面化学需氧量数值整体呈下降趋势,水体逐渐趋于清洁,且均符合《地表水环境质量标准》(GB3838-2002)Ⅲ类水质标准。但仍有部分地区有机物污染较严重,需继续加强治理。 相似文献
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Mohd Nasrullah A. W. Zularisam Santhana Krishnan Mimi Sakinah Lakhveer Singh Yap Wing Fen 《中国化学工程学报》2019,27(1):208-217
Electrocoagulation process using high current intensity to treat palm oil mill effluent(POME) was investigated in this study.Various operating parameters such as electrolysis time, inter-electrode distance and initial pH were carried out to determine the efficient process condition on the removal of chemical oxygen demand(COD),biological oxygen demand(BOD) and suspended solids(SS).The highest treatment was achieved at 50 min with the removal efficiencies for COD, BOD and SS obtained as 85%, 83%, and 84%, respectively.More than 50 min treatment showed the fluctuated trends of removal efficiencies which can be considered insignificant.The application of higher current resulted in higher removals of organics while the gas bubbles also assisted in removing the pollutant particles by floatation.In an inter-electrode distance study, the removal efficiency decreased when inter-electrode distance was either higher or lower than 10 mm due to the increase of solution resistance and the decrease of anode active surface area.In initial pH study, it was found that high removal efficiencies were achieved in slightly acidic POME sample rather than in neutral or basic condition.An electrocoagulation process by using the optimum operating parameters was able to remove COD, BOD and SS up to 95%, 94% and 96% respectively.The experimental results confirm that application of high current intensity in electrocoagulation provided high treatment efficiency at a reduced reaction time. 相似文献
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化学清洗废液是属于高难度处理的一种废水,其特点是废液中含有表面活性剂,使废液的化学耗氧量CODCr值非常高,即使采用专用机来处理,往往也要超标。为此,重点介绍了如何运用质量管理手段,即QC手段,来提高修船中化学清洗废液的处理质量。 相似文献
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以低C/N比污水为处理对象、基于物料平衡分析,研究了在MUCT工艺中硝化液内循环比与COD降解转化、PHA的代谢、磷的转移以及氮的转化等4个过程的关系。进水COD浓度恒定为(290±10)mg/L,TN浓度恒定为(55±0.5)mg/L,TP浓度恒定为(7.0±0.5)mg/L,改变硝化液内循环比,测定各反应段及出水COD、TN、TP浓度以及污泥中的PHA含量。试验结果表明:厌氧段去除的COD的63%~67%左右转化为PHA,在第二缺氧段和好氧段,PHA被消耗用于吸收污水中的磷,硝化液内循环比对第二缺氧段的消耗量有较明显的影响;硝化液内循环比对磷的释放过程影响较小,是第二缺氧段的吸磷过程的主要影响因素。 相似文献
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紫外吸光值(UV254\)作为有机物替代参数的探讨 总被引:26,自引:0,他引:26
通过对几种水样的紫外吸光度与有机物耗氧量之间的拟合相关方程的探讨表明,紫外吸光度做为有机物的替代指标,两者之间具有良好的线性关系,并且具有操作简单,快速准确的特点。 相似文献
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ABSTRACTIn this study, an ozonation process was used to increase biodegradability of textile wastewater by considering chemical oxygen demand (COD) and color removal. Response surface methodology was applied in order to determine the significance of independent variables which are initial pH, reaction time and ozone dose. While a biological oxygen demand (BOD)/COD rate of 0.315 was obtained at optimum conditions, which are pH 9, 75 min of reaction time and 26 mg/L ozone dose, color and COD removal was obtained at 74% and 39%, respectively. BOD/COD ratio value increased from 0.18 to 0.32 by ozonation process. In addition, k coefficient for BOD also increased from 0.21 to 0.30 d?1. 相似文献