1) the removal efficiency of COD and NH3-N
2) the removal efficiency of COD and ammonia
3) COD removal
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.
It was shown that the COD removal rate of sodium bentonite is 38.
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
On condition that the optimum dosage of Al_2(SO_4)_3 was 500 mg/L,the COD removal rate achieved 34%.
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.
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.
5) removal rate of COD
the result indicate that the best removal rate of COD was 7.
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.
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.
6) COD removal efficiency
The results showed that the COD removal efficiency could reach about 96% and CODcr of practical wastewater drop from 5827 mg/L to 419 mg/L while the chroma from 2000 to 30, reacting under the room temp.
The results showed that Co-Zn(1∶1)catalyst calcined at 400℃ exhibited better activity,the highest COD removal efficiency was achieved to 80% after 60 minutes reaction when the reaction conditions were 150℃,1.
The application test results indicated that when the addition dosage of this cationic starch ranging from(200 mg/L) to 300 mg/L and the pH value of the waste=11,COD removal efficiency of the dye-house wastewater can reach 90% and the color stripping efficiency can reach 78%.