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Coordinated treatment of actual coking wastewater with diatomite and granular sludge


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Coordinated treatment of actual coking wastewater with diatomite and granular sludge
Dong Chunjuan1Zhai Wei2Feng Meirong3Li Feng2Fan Honghui2
1.Department of Environment Engineering,Taiyuan University,Taiyuan 030009,China; 2.College of Environment Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China; 3.Science and Technology Communication Center,Taiyuan Science and Tec
expanded granular sludge bed reactors diatomite coking wastewater thiocyanate ion phenol ammonia nitrogen
To study the operation characteristic of the coordinated treatment of the actual coking wastewater with diatomite and granular sludge,two 18 L micro-aerobic expanded granular sludge beds(EGSB)reactors fed(R1+R2)with the coking wastewater are operated continuously for a period of over 7 months.The operation process contains three stages:the two-stage micro-aerobic EGSB without diatomite,the single-stage micro-aerobic EGSB with diatomite,and the two-stage micro-aerobic EGSB with diatomite.The results show that the diatomite can enhance the removal rates of chemical oxygen demand(COD),phenol,thiocyanate ion(SCN-)and cyanide in the micro-aerobic EGSB reactor treating actual coking wastewater,and the removal rates of COD,phenol,SCN- and cyanide increase respectively from 62.8%,62.6%,6.8% and 78.0% to 77.7%,96.7%,86.4% and 80.6%.The removal rate of ammonia nitrogen(NH3-N)decreases from 27.4% to negative value(the lowest is -35.0%).The two-stage micro-aerobic EGSB reactor system with diatomite can simultaneously achieve the high removal rates of COD,phenol,SCN-,cyanide and NH3-N.With 12 h+12 h hydraulic residence time(HRT)of R1+R2,the total removal rates of COD,phenol,SCN-,cyanide and NH3-N are 87.0%,99.9%,92.0%,90.6% and 86.0% respectively,and the effluent concentrations are 239.4,0.3,12.5,0.06, and 4.9 mg/L.In the micro-aerobic EGSB reactor with diatomite,the bio-diatomite and granular sludge formed synchronously can ensure the high biomass concentration,the enrichment micro-community and the enough nitrifying bacteria.SCN- and phenol can inhibit the activity of nitrifying bacteria,and the SCN- inhibition is due to the toxicity of SCN- itself,but not the increased loading of ammonia formed from SCN- degradation.The lower SCN- and phenol concentration are needed simultaneously for getting the higher NH3-N removal rate.


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Last Update: 2013-10-31