Effect of S/N on nitrogen transformation in sulfur autotrophic denitrification coupled anaerobic ammonium oxidation reaction
There is a common problem of high S/N in the S0-based sulfur autotrophic denitrification coupled anaerobic ammonium oxidation(sulfur autotrophic denitrification anammox,S0ADN-Anammox)process,resulting in the waste of S0.Thus,batch experiments were conducted to optimize the appropriate S/N in the sulfur autotrophic denitrification coupled anaerobic ammonium oxidation system when S0 was taken as the electron donor without considering the loss of S0.And the first half stage of the complete reaction of S0ADN was simulated through the substrate control strategy,then in the system environment of the second half stage of S0ADN and Anammox,their competitive ability for NO2--N in the presence of different S0 was discussed.The results showed that the S0ADN-Anammox system had a different denitrification performance at different S0 dosage.When S/N=l,the total nitrogen removal rate of the S0ADN-Anammox system was high and reached 89％,of which the removal rates of NH4+-N and NO3--N were 77％and 100％,respectively;when only NO2--N and NH4+-N existed,the higher the S0 mass concentration,the less NO2--N available to Anammox,and the competitive ability for NO2--N in the second half of S0ADN was stronger than Anammox,and too high S/N could affect the NH4+-N removal effect.
S0ADN-Anammoxthe impact of S/Nsubstrate competition relationship
万方数据
维普
