Experimental Research On The Treatment Of Printing And Dyeing Wastewater With Hydrolytic Acidification-biological Contact Oxidation Processes

Dyeing and printing wastewater has characteristic of high temperature, high concentration of pollutant, many kinds of colour and changes of quantity and water quality.In the experiment,in order to find out a viable technique route and get a valid design and control parameter of the model , measuring the COD, BOD5, pH of the waste water and analyzing the result and the variety regulations.Experimental water uses analogue dye wastewater. In this experiment, hydrolytic acidification-aerobic biological contact oxidation processes are adopted to treat printing and dyeing waste water.In the experiment, COD, BOD₅, PH, SS,the color degree, DO etc are analyzed.The processes start up by the method of feeding and culture.42 days of operation shows that the biofilm grows well and that the removing rate of COD is above 90% The stage one & stage two aerobic biological contact oxidation contribute most of the COD removal in the experimental process. The COD removal efficiency of the two aerobic contact oxidation treatment stages was 35% & 30% respectively, accounting for 75% of the total COD removal efficiency of the system.In the end,the effluent quality meets the requirement of discharge standard for wastewater.In order to get the better conditions of the experiment,the factors that might affect the operation of the reactor model were assessed through orthogonal experiment. Further more, some probably optimal operation conditions were recommended based on the date of the orthogonal experiment.In the experiment three influence factors were chosen and nine experiments were done ,and the best operation condition were found.At the same time,the contamination removal effect and the system stability under different condition of HRT of aeration part and anoxic part were studied in this paper.