Analysis of Organic Matter Removal and Nitrogen Removal Performance of a WWTP
The organic matter removal and denitrification performance of AAO bioreactor-secondary sedimentation tank-terminal sedimentation tank-first-stage activated coke adsorption tank-second-stage activated coke adsorption tank process in anindustrial wastewater treatment plant(WWTP)was investigated,and the variations and removal of dissolved organic matter were analyzed by three-dimensional fluorescence spectroscopy and ultraviolet-visible spectroscopy techniques.The results showed that the particulate,colloidal and soluble CODCr in the influent account for 25.6％and 74.4％of the total CODCr,respectively,the biodegradable and inert organics accounted for 39.6％and 60.4％of the total CODCr in the inlet,respectively,and that the biological tank had limited effect on the removal of refractory organics,which mainly depended on the adsorption of two-stage activated coke,the dissolved CODCr concentration in the effluent drops to 35.2 mg/L.The nitrification and denitrification capacities of activated sludge were low,with nitrification and denitrification rates of 0.34 mg N/(g SS·h)and 0.77 mg N/(g SS·h),respectively.
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