Influence of Electromagnetic Field Intensification on the Purification Effect and Microbial Composition of Black-smelling River Channels

ZHAO Xingjie; GUO Fengqian; LIU Yungen; YANG Silin; XU Chao; YIN Fajin; MA Rong

doi:10.19672/j.cnki.1003-6504.0951.24.338

Abstract：To enhance the treatment effect of bio-ecological combination technology on black-smelling rivers,we construct-ed an electromagnetic field-enhanced bio-ecological combination process.We investigated the purification effect of the bio-ecological combination process on pollutants and its microbial community structure characteristics under three conditions:no reinforcement measures(RS),magnetic field reinforcement(M-RS),and electromagnetic field reinforcement(ME-RS).The results show:(1)M-RS and ME-RS have higher purification effect on pollutants than RS,in which the NH4+-N removal rate are significantly improved,compared with RS,respectively,53.43 PP and 54.37 PP;ME-RS had a significant advantage in the removal of TP and COD,which were enhanced by 35.32 PP and 24.52 PP,respectively,compared to RS,and by 15.04 PP and 14.17 PP,respectively,compared to M-RS.(2)The most abundant phyla across all three treatments were Proteo-bacteria,Bacteroidetes,and Chloroflexi,comprising 71.88％to 79.23％of the total abundance.The abundance of Proteobacte-ria was dominant under all treatments.Compared to the RS treatment(48.90％),its abundance increased under both M-RS(62.28％)and ME-RS(64.69％)treatments,with the highest abundance observed under the ME-RS treatment;Betaproteobac-teria,Gammaproteobacteria and Alphaproteobacteria were the dominant phyla,which accounted for 45.70％to 61.91％of the overall,Betaproteobacteria and Alphaproteobacteria abundance increased under both M-RS and ME-RS treatments,with Be-taproteobacteria abundance being the highest in ME-RS at 26.85％;The relative abundance of Dechloromonas,Thermomonas and Flavobacterium at the genus level was elevated under both M-RS and ME-RS treatments and was highest under ME-RS treatment.(3)Redundancy analysis showed that Proteobacteria were the main drivers of TP and NH4+-N purification,and the results indicated that the enhanced decontamination ability of M-RS and ME-RS was associated with elevated abundance of microorganisms in this phylum and below.In conclusion,the abundance of denitrification and phosphorus removal microor-ganisms under electromagnetic field enhancement is higher than that of other treatments,and the purification effect of pollut-ants has been significantly improved,and electromagnetic field enhancement of biological and ecological combination pro-cess has obvious advantages for the treatment of black smelly water.