Upgrading Scheme and Project Design of a WWTP for Quasi-level Ⅲ Criteria
The requirements of the Discharge Standard for Urban Sewage Treatment Plant(DB 5301/T 43-2020)have been put forward in Kunming,a wastewater treatment plants(WWTP)in the south bank of Dianchi was required to be promoted to the class A effluent limits in its upgrading and reconstruction project.The existing process and operation situation of the WWTP were analyzed systematically,which showed that the further removal of TN and TP was regarded as the importance and difficulty of the project to achieve the project target by upgrading for biochemical pool and supplementing correspondingly special advanced treatment process for further removal of TN and TP.According to the results of the mechanism analysis for pollutants removal and the engineering examples,the upgrading for biochemical pool adopted the combined process of multi-point influent of increasing internal reflux ratio,feeding carbon source in anoxic zone,and multi-point chemical phosphorus removal and DO control.Additionally,the denitrification deep-bed filter and air floatation process were selected for the further removal of TN and TP,respectively.The design parameters were introduced,and combined with multistage treatment process,the whole treatment system had stable operation to finally reach the discharge standards.
high standardclass Ⅲ water dischargeupgrading and reconstructiondenitrification deep-bed filterair floatation process
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