Study on Biodegradation Kinetics in the Treatment of Tannery Wastewater by Micro-Electrolysis-SBR Process

The treatment efficiency of tannery wastewater by micro-electrolysis-SBR(sequencing batch reactor) and the kinetics of biodegradation in SBR process were both investigated in this paper.After micro-electrolysis process,the COD removal efficiency decreased 40%~60%,which makes the quality of wastewater more favorable for subsequent biological treatment.The final effluent water qualities of COD,SS,chroma,pH,BOD5,sulfide and total chromium all met the secondary national wastewater discharge standard.In SBR aeration process,the substrate degradation followed first order reaction kinetics.With 1.406 g·L-1 COD concentration influent,the rate constant K0,degradable COD concentration ρ0,and biochemical degradation rate were 0.28 h-1,1.218 g·L-1,86.6% respectively,and 0.32 h-1,0.493 g·L-1,82.0% of that at low COD concentration of 0.601 g·L-1.