Treatment Of Coke Plant Wastewater By Immobilized High Efficiency Predominant Bacteria

Coke plant wastewater containing toxic and refractory substances is treated by routine actived studge process,the residual COD can not achieve comprehensive wastewater discharge standard(GB8978-96).The key which reduces the effluent concentration of COD is to remove refractory organic pollutants.In this experiment, Proteus oulgaris BH and Bacillus DC45 which are two dominant species to degradate phonel,indole,pydine and quinoline were cultured and selected from four decolorizing bacteria - Proteus oulgaris BH,Bacillus DC45, Bacillus megaterium F3 and Bacillussubtilis DC42.In addition,BM7,DM1,EMS and BP3 which are four dominant species to degradate phonel, indole.pydine and quinoline were isolated and selected from activated sludge in aeration tank of coke plant.Degradation behavior of Proteus oulgaris BH,Bacillus DC45, BM7 and BP3 were researched. After putting dominant species which were immobilized on activated sludge into wastewater treatment system,coke plant wastewater was treated by the process of anaerobic hydrolysis-aerobic SBR,initial concentration of COD,BOD5, NHs-N ranged from 507.73 to 698.13 mg/L,from 153.86 to 232.00mg/L,from 181.44 to 195.05 mg/L respectively,after treatment of anaerbic acidification reactor for 12 hours and aerobic reactor for 18 hours,the residual concentration-of COD, BOD5, NH3-N ranged from 88.85 to 136.93 mg/L,from 23.47 to 39.30mg/L,from 61.69 to 77.11mg/L respectively.the total removal rate of COD, BOD5 and NH3-N were up to 80.39% ~ 82.50%,83.06% ~ 84.75%,60.47% ~ 66.00% respectively.After putting immobilizedPhotosynthetic bacteria into foregoing aerobic reactor,coke plant wastewater was treated by the process of anaerobic hydrolysis-aerobic SBR.initial concentration of COD, BOD5,NH3-N ranged from 923.47 to 1067.79mg/L,from 216.38 to 287.3mg/L,from 173.34 to 218.86 mg/L,after treatment of anaerobic acidification reactor for 12 hours and aerobic reactor for 18 hours,the residual concentration of COD,BOD5,NH3-N ranged from 112.08 to 147.45mg/L,from 26.92 to 32.60mg/L,from 45.73 to 52.60mg/L respectively,the total removal rate of COD, BOD5 and NH3-N were up to 86.19% ~ 87.86%,87.56% ~ 88.65%,73.62% ~ 75.97% respectively.The results show that after putting dominant species or dominant species and Photosynthetic bacteria which are immobilized on activated sludge into wastewater treatment system, the level of COD and BOD5 in coke plant wastewater which is treated by the process of anaerobic hydrolysis-aerobic SBR can achieve comprehensive wastewater discharge standard (GB8978-96), the turbidity decreases rapidly,NH3-N decreases to a certain degree.Moreover,for a built coke plant sewage treatment system,the treatment efficiency can be improved after putting dominant species and Photosynthetic bacteria which are immobilized on activated sludge into wastewater treatment system.