Results show that evapotranspiration load of the surface flow reed wetland is 0.9-1.12 m3/(m2·a) and the COD surface load is 0.65-0.786 kg/(m2·a) when the inlet COD concentration of the wastewater is around 800 mg/L.
At the same time,the COD concentration of control column D2 and D3 was dropped from 435mg/L,852mg/L to 295mg/L,596mg/L and the ammonia-N concentration was dropped from 654mg/L,(1?107mg/L) to 469mg/L,783mg/L.
The results indicate that the removal of chemical oxygen demand(CODcr) is about 80~94% on the aerobic condition that the pH from 7.5~8.7,the temperature from 25~32 ℃ and inlet COD concentration from 1 700~2 600 mg/L.
好氧段在pH值为7.5~8.7,温度为25~32℃,进水COD浓度为1 700~2 600 m g/L条件下,COD cr去除率为80%~94%。
When the C/N ratio is 5:1, denitrification velocity was increased with the influent COD concentration, when the influent COD concentration was 300mg/L, the denitrification velocity was 0.032mgNOx/mgVSS·h and 0.031mgNOx/mgVSS·h respectively, while the initial COD concentration was450mg/L, the velocity was 0.082mgNOx/mgVSS-h and 0.063mgNOx/mgVSS-h respectively, and no nitrite was accumulated.
Based on the analysis of the factors affecting river COD degradation coefficient and the systematic data investigation,an estimation model of river COD degradation coefficient from river velocity and COD density has been developed by progressive regression analysis method in this paper. The model reliability has been demonstracted by variance analysis.
Kinetics of COD degradation under lower COD level is also researched and first-order reaction equation Sr=So (1-10￣(-k)1￣t) is developed on SBR process. The equation is simulated by experimental data and the kinetic constants k1 and So are found.
When the concentration of COD,phosphorus and ammonia of influent was 325 mg/L,9.1 mg/L and 65 mg/L respectively,the concentration of ammonia and phosphorus was 3.3 mg/L and 0.17 mg/L. The efficiency of nitrogen and phosphorus removal was 95% and 98%.
UASB reactor was used for the erythromycin wastewater treatment,the results showed that: through effective cultivating the anaerobic granular sludge sand controlling the concentration of COD in the influent,erythromycin wastewater could be effectively treated. When the influent COD was 6700-7500mg/L,the effluent COD was 820-1000mg/L,the volumetric COD loading reached to 3-4.5kg COD/(m3·d) and COD removal rate reached 88%.
The wastewater COD level was 2000-3000 mg/L in simulation of real textile waste-water.
Furthermore, with the current trend of population growth and agricultural development in this basin, water quality of the Changjiang River, in terms of COD level, is going to deteriorate in the near future.
casei, decrease in effluent's colour of 49 and 52% and reduction in COD level up to 54 and 57% were achieved using bacterial cells in free and immobilised system, respectively, in 5 days batch cultivation.
Adapted cells, pregrown on phenol, required only 65 h to decrease the COD level to below 100 mg/l.
A seen in the Table 3, COD level was varied between 35-60 mg/L in indicating pollution level increases during the summer season.
This paper deals with the biochemical treatment of mixed waste water of antibiotic industry. The daily treating capacity is 60 kg COD with a fluidized bed device fitted with an air lift. Powdered coal ash from power plant is used as carrier of microorganism. Packing rate is about 5%. Inlet conc-
The hydrolysis method of dimethyl-thiophosphoryl Chloride is discussed in this essay. The wastes contain highly concentrated organophosphorus, and are very poisonous. After the treatment, the removability of the total phosphorus and COD value are greater than 90% and 88%,respectively.The ratio of BOD/COD value is raised from 0.123 to 0.45. The pollution is greatly reduced and the CaHPO4 and NaHS can be reclaimed.