Study On Treatment Of Coke Plant Wastewater By Electro Catalytic Oxidation-sequencing Biofilm Batch Reactor Combined Process

Coking wastewater is a difficult degradation of high concentration organic wastewater containslarge amounts of toxic and hazardous substances. If they are discharged directly without beingtreated, it will cause serious pollution of the surrounding environment, thus cause harm to humanhealth. For the current status of the majority of coking wastewater treatment plant effluent qualityindicators can not meet the national emission standards, the study combines electric catalyticoxidation and sequencing biofilm batch reactor organically, studies the combination process ofcoking wastewater treatment effect.This article focuses on the electro-catalytic oxidationpretreatment study,sequencing biofilm batch reactor and electro-catalytic oxidation depthtreatment of the three effects of coking wastewater treatment process, and through theperformance evaluation to determine the optimum condition of combination process, the results ofthe coking wastewater treatment in the future is of important theoretical significance and practicalapplication value.The main conclusions are as follows:（1）In the sequencing biofilm batch reactor, when the initial CODcr concentration of less than1578mg/L, the reactor through rapid degradation and slow degradation of two stages of cokingwastewater has better treatment effect, CODcr, volatile phenol and SCN-have significantlyreduced, due to volatile phenol of SCN-inhibition effect, SCN-degradation rate significantlyslower than that of volatile phenol, so it needs to reduce the concentration of volatile phenol in thereactor; when the initial CODcr concentration is higher than1780mg/L, because of the highconcentrations of toxic and harmful substances in the coking wastewater affected the growth ofmicroorganisms, the reactor shows instability, although it still can rely on the part of adsorptionremoval of CODcr, but the effect is not obvious.（2）In the sequencing biofilm batch reactor, filling rate of suspended filler is have certain effecton treatment effect. Through the research of putting the filling rate of different fillers in the reactorof the coking wastewater treatment effect, it is concluded that when the filling rate is50%,the degradation of substrate effect of the coking wastewater is best.（3）Experiment uses the way of electro-catalytic oxidation pretreatment to reduce the influentconcentration of coking wastewater in the sequencing biofilm batch reactor. By investigating thecurrent density and pH conditions on electric catalytic oxidation pretreatment of coking wastewatertreatment effect, it is concluded that the degradation efficiency did not increase with the increase ofcurrent density, but the degradation efficiency declines after reach a certain current density, this isbecause as the electrode current density, the rise of the electrode on the reactor starts, affected thereaction efficiency of the main; According to the experimental data obtained that in the currentdensity of20.3mA/cm2, acidic conditions is the best working condition of the electric catalyticoxidation pretreatment.（4）After3h electro-catalytic oxidation pretreating of the high concentration coking wastewater,it reduces the content of coking wastewater volatile phenol and other toxic substances into thecoking wastewater, after the water entering the sequencing biofilm batch reactor, the reactor canbe maintained stability and achieved good the treatment effect.（5）After the coking wastewater is treated by electro-catalytic oxidation pretreatment and thesequencing biofilm batch reactor, CODcr and ammonia levels were200mg/L, less than thenational emission standards (CODcr <100mg/L, ammonia nitrogen <15mg/L), so it needselectro-catalytic oxidation depth treatment.By investigating the current density and pH conditionson the depth of electric catalytic oxidation treatment of coking wastewater treatment effect, it isconcluded that because of the electrode on the occurrence of adverse events, the degradationefficiency did not increase with the increase of current density, the formation of by-productsaffected the reaction efficiency, after the performance evaluation, it is concluded that when thecurrent density is7.6mA/cm2, it consumes the lowest energy per ton water, and can meet thenational discharge standard.（6）Through the experiment, obtaining the optimum craft combination of coking wastewatertreatment and the optimum reaction conditions of each process.