The completely autotrophic nitrogen removal over nitrite(CANON)process as a novel nitrogen removal process was used to the treatment of synthetic mainstream wastewater so as to reduce the treat-ment cost.The start-up and stable performance of CANON process assisted by ferrous ions(Fe(Ⅱ))was investigated in the present study.The results indicate that the nitrogen removal rate(NRR)reaches(4.8± 1.1)g-N/(L3·d)with the help of 6.3 mg/L Fe(Ⅱ)at 15-23 ℃.Meanwhile,higher total nitrogen re-moval efficiency(TNRE)and ammonium nitrogen removal efficiency(ARE)of(97±1)％and(44.2± 9.3)％are achieved,respectively.The correlation analysis indicates that Fe(Ⅱ)dosing is an efficient regu-lation strategy for inhibiting nitrite-oxidizing bacteria.The mechanism for the optimized Fe(Ⅱ)level of 6.3 mg/L is related to the improvement of the activity of the functional consortium in the CANON process and the circular reaction of Fe(Ⅱ)with influent ammonia nitrogen and the conversion of other nitrogen com-pounds by the ferric iron-dependent denitrification process and ferric iron reduction coupled with the anae-robic ammonium oxidation process.
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