Study on the Mechanism of Microorganism Purged Wastewater in Sequence Constructed Wetland Process

The genric and amounts of microorganisms and effects of condition on microorganisms were investigated in sequence constructed wetland process, as well as removal COD, NH₄⁺-N and TP efficiency were investigated. The results obtained from test indicated that: there were 9 kind strains of microorganisms in constructed wetland, the major factor influencing the occurrence of each strain is the dissolved oxygen (DO); the major factor influencing the amounts of each strain is the temperature. lower effluent COD, NH₄⁺-N and TP concentrations and higher percentage COD, NH₄⁺-N and TP of removal are attained in summer, the other way round, higher effluent COD, NH₄⁺-N and TP concentrations and lower percentage COD, NH₄⁺-N and TP of removal are attained in winter.