1) chemical process to remove COD
化学法去除COD
2) chemical oxygen demand(COD) removal
化学需氧量(COD)去除
3) COD removal
COD去除率
1.
The effects of operating conditions such as ultrasonic frequencies,ultrasonic powers,Fenton's reagent dosage and pH value on color and COD removal were investigated.
研究内容包括:超声波频率对垃圾渗滤液色度和COD去除率的影响,超声波功率对垃圾渗滤液色度和COD去除率的影响以及Fenton试剂用量和pH值对垃圾渗滤液色度去除率和COD去除率的影响。
2.
It was shown that the COD removal rate of sodium bentonite is 38.
膨润土应用于城市污水的吸附研究结果表明:膨润土原矿对废水中COD去除率为38。
3.
Under these conditions,the COD removal is about 88 % when hydrogen peroxide is put in wastewater by one time.
对采用Fenton试剂处理苯酚废水进行了研究,探讨了n[H2O2]、n[Fe2+]/n[H2O2]、pH值、反应温度、反应时间等因素对COD去除率的影响,确定了最佳处理条件:n[H2O2]=13 mmol/L,n[Fe2+]/n[H2O2]=1∶10,pH=3,温度为30℃,反应时间为60 min,COD去除率在88%左右。
4) COD removal rate
COD去除率
1.
On condition that the optimum dosage of Al_2(SO_4)_3 was 500 mg/L,the COD removal rate achieved 34%.
通过对废水处理前后各项指标及处理成本等各方面因素进行综合分析,结果得知,Al2(SO4)3作为马铃薯淀粉废水的混凝剂较为合适,此时Al2(SO4)3的最佳投药量为500mg/L,对废水的COD去除率可达到34%左右。
2.
To improve the influence of such experimental parameters as roasted temperature, roasted time, the amounts of catalyst and H2O2, radiant time and pH value, it was studied that the COD removal rate together with the optimum conditions such as the roasted temperature of TiO2 at 500℃, roasted time at 2h, the amount of TiO2 at 2.
以TiO2为催化剂,用光催化氧化法处理制浆造纸废水,讨论了不同实验条件如焙烧温度、焙烧时间、催化剂用量、H2O2用量、光照时间及废水pH值等对废水COD去除率的影响。
3.
The influences of pH value,adding amount of chitosan,stiring rate and flocculating time on the COD removal rate are investigated,the optimal experimental conditions are determined as follows: pH range of wastewater 6.
由甲壳素制备壳聚糖用于制浆造纸废水的处理,考察pH、壳聚糖用量、搅拌速率及絮凝时间等对COD去除率和透光度的影响,得出最佳实验条件:pH为6。
5) removal rate of COD
COD去除率
1.
the result indicate that the best removal rate of COD was 7.
5%催化剂的投加量、pH=6的反应体系和50min的光照时间,达到最大COD去除率7。
2.
The harmless treatment of oilfield oily sludge by oxiding in supercritical water is studied in laboratory,and the effects of the reaction temperature,the reaction pressure,the reaction time and the pH value on the removal rate of COD in the oily sludge are investigated.
考察了反应温度、反应压力、停留时间、pH值等条件对含油污泥COD去除率的影响。
3.
The factors influencing the reactors,such as HRT,COD of influent,organic loading etc,are analyzed,whose effects on removal rate of COD,gas-producing ratio and VFA of effluent are also examined.
以不同的水力停留时间,进水COD浓度,有机负荷,内循环回流比为因素,考察对COD去除率,产气率和出水VFA(挥发性脂肪酸)的影响。
6) COD removal
COD去除
1.
The conditions and the effects of external factors on COD removal in the water sample by using Fenton's reaction are investigated.
当H2O2与Fe2+质量比为5∶3时,使COD去除率达到最高所需加入的H2O2+Fe2+量(单位g/L,下同),在暗光下为2。
2.
The results indicated that COD removal rate of 96.
L-1,HRT 24h,平均COD去除率达到96。
3.
We combined Fe(Ⅲ)-oxalate complex with H 2O 2 to develop a new photocatalytic oxidation system and investigated decoloration and COD removal of seven simulative dye wastewater with initial dye concentration 100mg/L.
在 2 5 0 W高压汞灯照射下 ,复合体系对初始浓度为 1 0 0 mg/L的染料溶液 ,处理 2 4 min后 ,脱色率均达 90 %以上 ,COD去除率为33%～ 70 %。
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