WANG Yue,WANG Hai,SHI Shuo-hui,et al.Comprehensive Influencing Factors of Backwashing Efficiency of Denitrifying Biofilter and Its Microbial Community[J].China Water & Wastewater,2021,37(1 1):76-80.
Comprehensive Influencing Factors of Backwashing Efficiency of Denitrifying Biofilter and Its Microbial Community
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
1 1
Page:
76-80
Column:
Date of publication:
2021-01-01
- Keywords:
- denitrifying biofilter; gas and water combined backwashing; microbial community; orthogonal experiment; PCR-DGGE
- Abstract:
- Effects of water washing intensity, water washing time, gas and water combined washing time, gas washing intensity, filler particle size on backwashing efficiency and microbial community of denitrifying biofilter were investigated by orthogonal experiment. When the operation cycle, water consumption and system recovery time of the denitrifying biofilter were selected as the comprehensive evaluation index of the backwashing efficiency, the significant order of each factor affecting the comprehensive evaluation index was: water washing intensity, gas and water combined washing time, gas washing intensity, filler particle size and water washing time. The optimum conditions were as follows: particle size of 2-4 mm, gas washing intensity of 15 L/(m2·s), water washing intensity of 10 L/(m2·s), and gas and water combined washing time of 8 min. The results of PCR-DGGE analysis showed that the backwashing had significant effects on the biomass and biodiversity of the filter layer. However, it had little effect on the biological activity and microbial community abundance of the filter layer.
Last Update:
2021-01-01