1) COD method
COD法
1.
Application of COD method in nonmetal pipe exploration;
COD法在非金属管线探测中的应用
2.
Topics include electrical prospecting method, magnetic prospecting method, COD method and so on.
简述了目前国内外的地下管线探测技术,其中包括电探测法、磁测法、COD法等,分别介绍了各自的原理、特点和应用情况,以及相关的仪器设备。
2) colorimetric methods
COD比色法
1.
To counter the technologic characteristics of COD colorimetric methods, the paper summarizes the problems and experiments during the normal application of COD colorimetric methods and tell us how to how to improve degree of precision and accuracy rate of COD colorimetric methods.
针对COD比色法测试的技术特点,通过总结日常分析、验收考核中存在的经验和问题,给出了如何提高COD测试仪测量精密度、准确度的方法和仪器质量的核查方法。
3) new COD approach
新COD法
4) BOD 5/COD ratio method
BOD5/COD比值法
5) CODCr
COD
1.
Detection of CODcr by Microwave Digestion Photometric Method and Its Unified Benefits Analysis;
微波消解光度法测定COD及综合效益分析
2.
The correlation of BOD5 and CODcr were analyzed in this paper according to the measured data of water quality of Cihu Lake in Hubei Province and the mathematical statistics, and meanwhile some questions in applying the correlation are also presented.
根据湖北省磁湖的实测水质数据资料,应用数理统计的方法分析了该水体BOD5和CODcr间的相关关系,同时也指出了一些BOD5和CODcr的相关性在实际应用中应该注意的问题。
3.
Properties of modified bentonite were characterized by various analysis techniques and modified bentonites were applied to pretreatment of high strength landfill leachate with CODCr up to 20,000~37,000mg/L.
将其应用于COD高达20000～37000mg/L的垃圾渗滤液的预处理,以垃圾渗滤液的COD去除率为考察指标,对原土和有机改性土的处理效果进行了对比,确定了改性膨润土最佳用量以及最佳反应条件。
6) chemical oxygen demand
COD
1.
The experimental results show that the declining rates of chromaticity and chemical oxygen demand(COD) can extend to 84% and 60% respectively.
实验结果表明:在pH值为3,m(Fe)/m(C)为6,转速为150r/min,振荡反应120min的条件下,色度下降率达到84%以上,化学需氧量(COD)下降率大于60%,水质得到明显改善,有利于后续生化处理。
2.
The main defects of the standard method for the determination of chemical oxygen demand in water by potassium dichromate, such as measurement time consuming, Hg salt polluting, Cl~- disturbance were ameliorated by increasing acidity and adding catalyst silver sulfate.
重铬酸钾标准法测定水样的COD存在耗时长、汞盐二次污染和氯离子干扰等缺陷。
3.
It is shown that colority and chemical oxygen demand of the wastewater can be decreased to thirty times and less than 300 mg/L respectively by 10% iron(Ⅲ) chloride liquor and powdered carbon.
结果表明:采用10%FeCl3溶液和粉末活性炭处理该尾水,色度和COD一般分别可降到30倍与300mg/L以下,达到酒精行业废水排放二级标准。
补充资料：COD法
弹塑性断裂力学中以裂纹顶端的张开位移作为断裂准则的一个近似的工程方法，是英国的A. A. 韦尔斯于1963年提出的。COD是英文crack opening displacement（意为裂纹张开位移）三字的缩写。它指裂纹上、下表面在拉伸载荷作用下在裂纹顶端出现的张开型的相对位移，可用来表征含裂纹的平板在裂纹顶端的物理状态。当裂纹顶端张开位移δ 等于裂纹顶端张开位移的临界值δc（即δ＝δc）时,裂纹开始扩展。δc由实验测定；δ则根据英国的D.S.达格代尔于1960年提出的在裂纹延长线上存在"窄带屈服区"的模型(即D模型)计算。 对于无限大平板，裂纹顶端张开位移的表达式为：
式中σ为拉伸应力;a为裂纹的长度；E为材料的弹性模量（见材料的力学性能）；σY为材料单向拉伸的屈服极限。用弹－塑性有限元法也可计算裂纹张开位移。
参考书目
D.G.H.Latzko,ed.,Post-yield Fracture Mechanics,Appl.Sci.Pub.,London,1979.
式中σ为拉伸应力;a为裂纹的长度；E为材料的弹性模量（见材料的力学性能）；σY为材料单向拉伸的屈服极限。用弹－塑性有限元法也可计算裂纹张开位移。
参考书目
D.G.H.Latzko,ed.,Post-yield Fracture Mechanics,Appl.Sci.Pub.,London,1979.
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条