Efficacy Of Zone/Microelectrolysis Process Treating Chemical Fiber Dyeing Wastewater

The ozone/microelectrolysis process is proposed in this paper,looking forward to solving the problem that the polyester dyeing wastewater can not be well treated by traditional biochemical treatment.In general chemical fiber wastewater contains a large amount of polyvinyl alcohol(PVA)and various kinds of disperse dyes,which has a high COD value and the biodegradability is deteriorated.This paper verify the efficiency of the ozone/microelectrolysis process treating wastewater which contains PVA and disperse dyes.And proposed a "ozone/micro-electrolysis-SBR" treatment for chemical fiber printing and dyeing wastewater.In this paper,the removal efficacy of four methods(ozone process,microelectrolysis process,ozone/TSA process and ozone/microelectrolysis process)were studied and the optimal method was selected.Then the wastewater of PVA or disperse dyes was studied respectively to optimize the parameters of this process.In addition,this paper study the ozone/microelectrolysis process' s efficiency of treating simulated wastewater which mixed with PVA and disperse dyes.The effluent from the above experiment was introduced into the SBR bioreactor to verify the enhancement of wastewater's biodegradability after the ozone/microelectrolysis process and try to save the ozone dosage.Ozone/microelectrolysis process can significantly improve the degradation efficiency of PVA in wastewater,compared with ozone process or microelectrolysis process.PVA can not be deteted in 20 minutes.When the PVA initial concentration is 400 mg/L,the optimum conditions for treating wastewater containing PVA is the dosage of ozone is 250 mg/(L·h).After 60 minutes treatment,the COD removal rate is about 65%.The effluent is connected with SBR bioreactor,and the COD of SBR effluent is about 170 mg/L.During the process,the hydroxyl radicals co-produced by ozone and filler are the main active groups to produce ?-aldehydes.Ozone/micro electrolysis process can significantly improve the degradation efficiency of disperse dyes in wastewater,compared with ozone process or microelectrolysis process.When the initial concentration is 200 mg/L,the optimum conditions for treating wastewater is as follows: the dosage of ozone is 150 mg/(L·h),the initial pH of the wastewater is 3.After 60 minutes treatment,the COD removal rate is about 95%.The effluent is connected with SBR bioreactor,and the COD of SBR effluent is about 80 mg/L.Under the condition that the initial PVA concentration is 200 mg/L and the initial concentration of disperse blue 56 is 200 mg/L,the dosage of ozone is 150 mg/(L·h),the initial pH valuer is 3,after 60 min ozone/microelectrolysis process,the COD removal rate of simulated wastewater is about 55%,and COD of the effluent dereased to about 180 mg/L.To some degree,under different water quality of the influent,SBR reactor has the ability to stay stable.The effluent's COD is about 120 mg/L.The cost of ozone/microelectrolysis process treating polyester wastewater containing PVA and disperse dyes is about 2.224 yuan per ton.