The long-term and short-term effect of Fe(Ⅲ)on nitrogen removal efficiency of Anammox sludge
The effects of Fe(Ⅲ)concentration on nitrogen removal efficiency in Anammox sludge were studied in short-term and long-term.The proper amount of Fe(Ⅲ)could enhance the nitrogen removal efficiency of Anammox bacteria,0.09mol/L was the most suitable concentration,the nitrogen removal rate was 0.238kg/(L·d),compared with the control group increased by 14.2%.The nitrogen removal rate was decreased gradually with the influent Fe(Ⅲ)concentration increased constantly.When the Fe(Ⅲ)concentration increased to 0.18mol/L,the nitrogen removal rate dropped to 0.215kg/(L·d)decreased by 10.75%compare with 0.09mol/L.The half-saturation constant(KFe)was 0.012mol/L,the inhibiting kinetic constant(KI)was 0.449mol/L obtained by Haldane inhibition kinetic model fitting.The long-term experiment results showed that at 0.09mol/L Fe(Ⅲ)concentration,the nitrogen removal rate of Anammox increased the fastest,and gradually decreased with the increase of Fe(Ⅲ)concentration.the conversion ratio of NO2--N and NH4+-N was significantly lower than the theoretical value of 1.32,fluctuate between 1.108 and 1.227,and decreased with the increase of concentration of Fe(Ⅲ),presumably due to the addition of Fe(Ⅲ)instead of NO2--N as electron acceptor.Scanning electron microscope results showed that the addition of Fe(Ⅲ)could make the Anammox bacteria cell structure more stable.
Fe(Ⅲ)anammoxnitrogen removal performanceinhibition kineticsscanning electron microscope
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