Research On Production Wastewater Of Li Battery By Combined Process Of Iron/carbon And Micro-Electrolysis-Fenton-Biochemical

In the recent years,with the development of Li Battery and its widely use,the wastewater of production attracts people's attention.Wastewater characteristics are as the follows: complex pollutant components,big biological toxicity,difficult to biodegrade,and so on.The research to deal effectively with the wastewater are rarely reported.According to the lithium battery production process and the actual water quality characteristics of wastewater,by analyzing and comparing the research status of high concentration wastewater at home and abroad,combined process 'Fe/C micro electrolysis — Fenton — UASB — BCO are used to make research about it.Each processing unit are studied to find out the best technological parameters of the system.To form a set of combination process,considering the comprehensive treatment effect.The experimental results show that:(1)Fe/C micro electrolysis is used to treat cathode production wastewater.Through orthogonal test and single factor experiment,we can get that the quality of the iron carbon ratio of 3:1,pH value of 3,iron dosing quantity is 150 g/L,the reaction time for 60 min,iron carbon micro electrolysis water effect is best.By GC-MS map you can see that the target pollutants NMP got good degradation effect;CODcr is decreased from 7980 mg/L to 4300 mg/L.And the removal rate is 47%,biochemical indicators B/C ratio is increased from 0.11 to 0.23.The degradation of CODcr method conforms to the level of degradation dynamics,after level regression equation fitting of the equation is obtained for Ct=7882.4e-0.00975 t,the reaction rate constant is 0.00975 and the correlation coefficient of fitting curve is R2 = 0.970(2)Fenton oxidation is used to treat with mixed wastewater.Through orthogonal test and single factor experiment,in the pH = 3,H2O2 concentration of 1 ml/L and 60 min' reaction time,it can achieve the best effect of oxidation.By GC-MS spectrum can be analyzed,the target pollutants NMP has been further degradation.CODcr is decreased from 4300 mg/L to 2290 mg/L,removal rate as high as about 50%.And the biochemical index B/C rises to 0.45 from 0.23,which reached into the general requirements for a biochemical system.(3)UASB-BCO biological group legal treatment is used to treat with mixed wastewater of preprocessed cathode and anode,CODcr degradation can reach below 120 mg/L.(4)Using ways to treat with lithium battery production wastewater,the upgrading and retrofitting project of Lithium battery production wastewater treatment station achieved the relevant discharge standards.The effluent quality can reach the indirect discharge values of water pollutation for new enterprises of the Emission Standard of Pollutants for the Battery Industry(GB30484-2013)with the combined process' iron/carbon micro-electrolysis-Fenton-Biological.