查询词典 cod

When the wastewater's COD was 1533 mg/L, the optimum pH value was 1.2, the dosage of chlorine dioxide was 1500 mg/L after reacting for 60 min and the COD removal efficiency and the decolor efficiency were 45.3% and 92.5%, respectively.

二氧化氯化学氧化处理COD为1 533mg/L的萘酚绿废水，在最佳pH值为1.2，二氧化氯投加量为1 500 mg/L，反应时间60 min条件下，COD去除率和脱色率分别为45.3%和92.5%。

The best decolorization rate of the decolorizer Ⅰ was 96.3%, while the best removal rate of COD was 78.1%. And the best decolorization rate of the BWD-01 was 93.3%, while the best removal rate of COD was 68.4%.

高效脱色絮凝剂Ⅰ脱色率最高达到96.3%，COD去除率最高达到78.1%；BWD-01脱色率及COD去除率最高分别达到93.3%和68.4%。

With the increase of Hydraulic loading in anaerobic columns, the rate of exorcize of kjeldahl nitrogen and COD drop gradually, when the hydraulic loading increase to 20 ml/L.d, the the rate of exorcize of kjeldahl nitrogen drop to 60%; when the hydraulic loading increase to 21-23 ml/L.d, the rate of exorcize of COD drop to 20%.

厌氧柱中随着水力负荷的增大，凯氏氮和COD的去除率均呈现逐渐下降，水力负荷增加到约20ml/L·d，凯氏氮的去除率直线下降到60%以下；水力负荷增加到21～23 ml/L·d，COD的去除率直线下降至20%。

The change is very distinctly of the rate of exorcize of COD in every columns, the rate of exorcize of COD is about 80% in aerobic column which better than anaerobic column.

各填埋柱渗滤液回灌前后COD的去除率变化较大，好氧柱普遍高于厌氧柱，好氧柱COD能够稳定在80%左右。

The results show that the rate of decolorization of activating calcareous adsorbentis is 99.33%, COD removal rate equals to 85% when the pH 7 for acid fuchsin dye, 10 mg/L initial concentration of dye 10 g/L adsorbent 103.5 mg/L initial COD adsorb 5 min.

结果表明，处理含偶氮结构的酸性品红染料废水，当初始pH值为7、初始浓度10 mg/L、吸附剂用量10 g/L、原水COD 103.5 mg/L时、吸附反应5 min后色度去除率为99.33%，COD除去率为85%。

The analytical methods to determine COD in chemical wastewater by using silver nitrate in place of mercury sulfate to mask chloride ion were studied; Extracting silver chloride precipitation from the determined COD waste liquid, the feasibility of preparing silver sulfate catalyst by the direct reaction of silver chloride and concentrated sulfuric acid was analyzed.

研究了用硝酸银代替硫酸汞掩蔽氯离子测定化工废水中COD的分析方法；试验了从COD测定废液中提取氯化银沉淀，直接用氯化银与浓硫酸反应制备硫酸银催化剂的可行性。

Results showed that advanced oxidation technique of ozonization has a good effect on removal of acid red B. After 30 min reaction with pH=7, up to 99.5% of color decay was obtained and chemical oxygen demand was 37.9%. If initial pH of the wastewater was increased to 11, the removal rate of COD was optimum.

结果 在pH=7的条件下，单一臭氧氧化30 min时，废水的色度和COD去除率分别为99.5%和37.9%；而废水的初始pH值控制在11左右时，COD去除率有较大提高。O3/H2O2氧化工艺，适宜的H2O2和O3物质的量比为0.6，氧化处理30 min废水的COD去除率可达53.5%。

In the experiment, the study on result of measurement of COD by potassium dichromate method has been conducted in the aspect of impact and application scope, proposing the method of measuring low COD in waste water of high chlorine and putting forward new comment on its influence factor.

本试验采用重铬酸钾标准法对COD测定结果的影响程度与适用范围进行了探索，提出了用低浓度重铬酸钾氧化法测定含高氯根废水中低COD的方法，对其影响因素提出新的看法。

As an often used physical model with good theoretical and practical values, StreeterPhelps model has been widely used to study water quality. However, in some special water areas the utilitization of StreeterPhelps model has some limitation as confirming reaeration coefficient often comes from tests in rivers with fast water flow speed with no consideration of wave effects. Furthermore, in practical research in Three Gorges Reservoir, the changing rule of COD appears abnormally. In some water areas far from pollution source, the value of COD changes with time, but does not follow the exponential attenuation rule. This phenomenon can not be explained by former modified StreeterPhelps model.

StreeterPhelps模型是目前进行河流水质研究常用的物理模型，具有良好的理论和实用价值，然而在某些特定水域，该模型的应用受到限制，主要原因是复氧系数的取定多在水流速度较大情况下得到的，而未考虑水面波动对复氧系数的影响，另外，在实际研究过程中发现三峡库区COD变化的规律出现异常：在离排污口相当远的水域，COD随时间变化趋势并不是指数衰减，而是在某个常值附近微小摆动，以往很多修正过的StreeterPhelps模型都无法解释这个现象。

However, in some special water areas the utilitization of StreeterPhelps model has some limitation as confirming reaeration coefficient often comes from tests in rivers with fast water flow speed with no consideration of wave effects. Furthermore, in practical research in Three Gorges Reservoir, the changing rule of COD appears abnormally. In some water areas far from pollution source, the value of COD changes with time, but does not follow the exponential attenuation rule. This phenomenon can not be explained by former modified StreeterPhelps model.

StreeterPhelps模型是目前进行河流水质研究常用的物理模型，具有良好的理论和实用价值，然而在某些特定水域，该模型的应用受到限制，主要原因是复氧系数的取定多在水流速度较大情况下得到的，而未考虑水面波动对复氧系数的影响，另外，在实际研究过程中发现三峡库区COD变化的规律出现异常：在离排污口相当远的水域，COD随时间变化趋势并不是指数衰减，而是在某个常值附近微小摆动，以往很多修正过的StreeterPhelps模型都无法解释这个现象。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。