Application of Integrated Fixed Film Activated Sludge/Catalytic Ozonation Processes in Upgrading and Reconstruction of WWTP
Dongying S wastewater treatment plant(WWTP)underwent an upgrade to comply with more stringent sewage discharge standards.With a capacity of 20000 m3/d,the WWTP is retrofitted with an integrated fixed film activated sludge/ozone catalytic oxidation process.The process operation results indicate that the implementation of this novel process has significantly improved the removal efficiency of organic matter and nitrogen.Simultaneously,C/N in the biochemical tank decreased from 5.74 to 4.53 with a 58.9%reduction in sodium acetate carbon source dosage under virtually similar influent water quality and temperature conditions.The biochemical effluent had reductions in CODCr,ammonia nitrogen and total nitrogen from 52.2,2.2,14.0 mg/L before the upgrade to 42.8,1.2,8.7 mg/L respectively.The average CODCr of the ozone catalytic oxidation effluent is measured at 20.4 mg/L.The integrated fixed film activated sludge system forms a dense and continuous biofilm,which includes dominant bacterial groups such as Candidatus_competibacte and Nitrospira,ensures stable nitrogen conversion and effective organic matter removal.The dissolved organic matter(DOM)removal efficiency in the biochemical stage increases from 32.4%to 44.7%,and the ozone catalytic oxidation process essentially eliminated difficult-to-degrade organic compounds such as cresol and toluene in the biochemical effluent.Moreover,the cost of water treatment chemicals remains essentially unchanged before and after upgrading,meeting the increased emission requirements.
integrated fixed film activated sludgecatalytic ozonationdominant bacterial groupsdissolved organic matter(DOM)
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维普
