Deep denitrification and dephosphorization performance of autotrophic denitrification in different ore mass ratios
Aiming at the problems of high sulfate concentration in effluent from conventional filter media of auto-trophic denitrification technology and inability to remove phosphorus synchronously,the denitrification and de-phosphorization performance of composite mineral sources filter media(MSAD)is explored through batch experi-ments,and the denitrification and dephosphorization effects of pyrite(FeS2)and siderite(FeCO3)at different mass ratios are analyzed.The results show that,compared with single FeS2 as electron donor,the composite min-eral sources(FeS2 and FeCO3)possess higher nitrate removal rate,lower sulfate concentration and more stable pH value.On the 4th day of stable operation after domestication,the system with m(FeS2)∶m(FeCO3)= 2∶1 exhib-itsd supreme denitrification performance(removal rate of NO3--N is 93%,and TN is 86%).The removal efficiency of total phosphorus in the system with m(FeS2)∶m(FeCO3)= 1∶1 is the highest(65%).Species analysis show that the microbial species responsible for sulfide autotrophic denitrification are dominant in the composite mineral source.This study provides a theoretical reference for the selection of mineral sources in engineering practice of autotrophic denitrification technology.
autotrophic denitrificationpyritesideritedenitrification and dephosphorization
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