| Printing and dyeing wastewater is the mixture for fabric dyeing, printing and triming wastewater. This kind of wastewater shares the characters of large quantity discharge, high CODCr and chromaticity color, low bio-degradability, which makes its treatment very difficult. This experiment research shows that it is technical feasible for the treatment of printing and dyeing wastewater with the process of hydrolysis and acidification -biological contact oxidation –chemical oxidation –adsorption. During the stable operation state, the original wastewater's average CODCr gets to 2843mg/L, yet the out below 100 mg/L , and at the same time, the standards of chromaticity color and SS respectively fits our desirable goal. The corresponding maximum CODCr lord is 4.59 KgCOD/(m3.d),and the minimum HRT is 15 h. Hydrolysis and acidification process is employed to improve the wastewater's bio-degradability. Experiment data shows that Hydrolysis and acidification process could improve the BOD5/ CODCr from 0.19 to 0.44, which created a benefit condition for the following aerobic oxidation treatment. In the experiment on the anaerobic—aerobic treatment of printing and dyeing wastewater with the equipment of UASB and SBR, the perfect controlling conditions are studied. The data of UASB anerobic treatment shows that when the temperature is 30℃, HRT 18 h, the removal rate of CODCr and chromaticity color respectively gets to 61.8% and 70.5%. MLSS:3500mg/L,aerotion rate:1.0m3/h,8h for hydraulic retention time is the perfect controlling condition for aerobic treatment, when the removal rate of CODCr and chromaticity color respectively gets to 76.7% and 66.7%. Then treated by subsequent chemical oxidation and adsorption with fly ash, production water fits perfectably the exhaustion standard of national one class. All this shows us that the research data could be employed for the real project's devise and further research, which could give some useful reference to the treatment of similar wastewater. |
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