共查询到18条相似文献,搜索用时 93 毫秒
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钱瑾 《环境监测管理与技术》2013,25(5):52-55
通过在线TOC水质自动分析仪方法与实验室COD方法比对,建立TOC-COD一元线性回归方程,且将其应用到上海市44家污水处理厂出水中TOC与COD值的转换,并在污水处理厂进行在线TOC水质自动分析仪及在线COD水质自动分析仪监测值比对实验。结果表明,TOC-COD一元线性回归方程相关系数r为 0.963,废水中TOC与COD值线性显著相关,通过上述回归方程将在线TOC水质自动分析仪监测值转化COD监测值与在线COD水质自动仪监测值进行相对误差比较,88.4%的数据满足《水污染源在线监测系统安装技术规范(试行)》(HJ/T 355-2007)规范要求;用上述转换方程换算上海市44家污水处理厂TOC值得到的COD值与实验室COD值进行误差计算, 87.3%的数据满足上述规范要求,验证了在线TOC值转换COD值在污水行业的适用性。 相似文献
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通过实验证实COD测定仪法具有较好的精密度和准确性,与标准回流法的分析结果比较,相对误差为-3.37%~1.41%,具有替代标准回流法的可行性。由于水样性质不同,所需最佳消解时间不同,通过比较不同消解时间下COD测定的结果,得到COD测定仪法测定水中COD所需的最佳消解时间分别为:工业废水60 min,生活污水和地表水90 min。 相似文献
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通过对地表水、生活污水和工业废水样品的紫外吸光度与化学需氧量(或高锰酸盐指数)测定值进行线性回归分析,得出不同类型水体的紫外吸光度与化学需氧量(或高锰酸盐指数)之间具有良好的相关性,在一定条件下,可利用测定的紫外吸光度推算出化学需氧量(或高锰酸盐指数)结果。 相似文献
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氯酸钠是污水处理厂处理污水时常用的一种氧化剂,会对COD的测定产生负干扰。有的污水处理厂对含过量氯酸钠的污水未进行处理而直接外排;也有的污水处理厂为逃避环保部门的监管,在外排口投入过量氯酸钠,干扰COD测定,人为降低污水COD测定值。因而,研究氯酸钠对废水COD测定的干扰具有重要的现实意义。通过对标准样品和实际样品进行检测,发现氯酸钠对COD测定的干扰程度(真实值与测定值的差值)随着氯酸钠浓度的增加而增大。当氯酸钠浓度在100~1 000 mg/L范围内时,干扰值的大小与氯酸钠浓度呈显著正相关(P<0.05,r=0.997 4),且相同浓度氯酸钠对不同浓度COD测定产生的干扰无显著性差异。从追踪反应过程中不同形式氯元素含量的角度,进一步探究了氯酸钠对COD测定的干扰机理,发现氯酸钠对COD测定的干扰来自两个反应过程,分别是氯酸钠在消解过程中与还原性物质的反应、未完全反应的氯酸钠在滴定过程中与硫酸亚铁铵的反应,并且两个反应过程都会对COD的测定产生负干扰。根据干扰机理,研究建立了干扰校正方法,即校准曲线法。此方法具有较好的精密度和正确度,可以满足实际废水样品的测定要求。 相似文献
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孙力 《环境监测管理与技术》2005,17(1):47-47
通过测定水中TOC浓度,可综合性地判断废水中有机物污染的程度,也能全面、合理地了解废水中的有机污染物。现采用TOC4100燃烧氧化-非分散红外吸收测定仪,对几种印染废水进行分析测试,并通过对TOC值与COD值的比较,找出印染废水中TOC与COD的相关性。 相似文献
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经 5 B型 COD速测仪消解后 ,出现浑浊不能进行光度比色分析的特殊工业废水 ,可用0 .0 2 5 mol/L硫酸用亚铁铵滴定 ,通过计算得出其COD值 ,测定结果与经典标准回流滴定相一致 ,可用于实际工业废水 COD测定中不能用 COD速测仪比色分析的水样。用COD快速测定仪测定废水中COD特殊水 相似文献
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纺织印染废水中TOC值和COD值的相关性 总被引:1,自引:0,他引:1
林晶 《环境监测管理与技术》2004,16(5):16-18
论证了纺织印染废水中TOC值和COD值的相关性,建立了COD和TOC的相关关系式。通过对实测的TOC值和COD值进行的一系列数理统计显著性检验,证实了纺织印染废水中TOC值和COD值之间具有良好的相关性,但基于生产过程、设施装置和排污情况的差异,印染企业在运用COD和TOC的相关关系式时,应根据自身的具体情况,通过实验建立相应的回归方程。 相似文献
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Adam Faschan Marty Tittlebaum Frank Cartledge Harvill Eaton 《Environmental monitoring and assessment》1992,22(3):199-212
Several combinations of binders and absorbent additives were utilized to solidify a typical organic waste, API Separator sludge. The effectiveness of the materials was based on the waste leachability from the solidified samples. COD and TOC analyses were used to determine the organic content of the leachate samples.The ability of the COD and TOC analyses to assess waste leachability was limited. The inability of the COD and TOC tests to differentiate between organic compounds made the results difficult to interpret. This was due to organic contaminants from the solidification materials contributing to the COD and TOC contents of the leachates. Also, the COD test may have be influenced by reduced inorganic compounds contained in the flyash binder and the sludge. Representative samples for the TOC analysis were difficult to obtain for the leachates containing oils or suspended particles. It is recommended that the COD and TOC tests only be used as a screening method for determining solidified organic waste leachability and other methods need to be employed to obtain more accurate results. 相似文献
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COD与TOC测定方法的比较 总被引:1,自引:0,他引:1
系统地对比了 COD和 TOC 两种水中有机污染指标测定方法原理,得出了 TOC 在直接代表水质有机污染、氧化有机物完全、产生二次污染物少、测定时间短和消耗劳动力少等方面优于 COD 的结论,并分析了 TOC 取代 COD 的难点和趋势。 相似文献
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Karthikeyan OP Swati M Nagendran R Joseph K 《Environmental monitoring and assessment》2007,135(1-3):141-151
Emissions from landfills via leachate and gas are influenced by state and stability of the organic matter in the solid waste
and the environmental conditions within the landfill. This paper describes a modified, ecologically sound waste treatment
technique, where municipal solid waste is anaerobically treated in a lysimeter-scale landfill bioreactor with leachate recirculation
to enhance organic degradation. The results demonstrate a substantial decrease in organic matter (BOD 99%, COD 88% and TOC
81%) and a clear decrease in nutrient concentrations especially ammonia (85%) over a period of 1 year with leachate recirculation. 相似文献
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浅谈TOC与CODCr的关系 总被引:10,自引:0,他引:10
介绍了TOC和CODCr的含义,比较了TOC与CODCr测定方法、使用仪器的不同和各自的优缺点,并从理论上和实际水样测定中论述了TOC和CODCr的相关性。对于不同的废水,TOC 与CODCr的相关性不一样,必须先实验求出二者之间的关系。 相似文献
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推荐了污水和工业废水中COD的快速测定方法,与标准法相比,缩短1.5h的回流时间,节省了水电,以硝酸银代替了硫酸汞,避免了汞污染,扩大了测定范围,具有较好的精密度和准确度,适于大批水样测定,很有推广价值. 相似文献
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The seasonal effects of untreated and treated municipal sewage on the nutrients-nitrate (NO(3)), phosphate (PO(4)), sulphate (SO(4)), and the biochemical oxygen demand (BOD), chemical oxygen demand (COD) and dissolved oxygen (DO) of the receiving urban canal, the Buckingham canal at Kalpakkam (Tamil Nadu, India) was monitored monthly during pre- monsoon-2005 to post-monsoon-2006. The NO(3), PO(4) and SO(4) contents were higher in the downstream than that of the upstream of the outfall points of treated as well as untreated sewage, of the canal. The NO(3) and PO(4) contents were higher during summer than that of monsoon; however the SO(4) was higher during winter and lower during summer in the canal water. The BOD and COD were lower and DO was higher at the upstream than that of downstream of the canal. The concentrations of BOD and COD were higher during summer season, which decreased during monsoon season, while the DO decreased during the summer season and increased in monsoon season in the canal water. Cluster analysis applied to the six sampling points of the canal, has grouped them based on the water quality similarities. 相似文献