Jianmin LI, Qing YANG, Zhibin LIU, et al. Influences of Fe2+/Fe3+ and Mn2+ on total nitrogen removal and nitrogen transformations during low-oxygen aeration[J]. CIESC Journal, 2019, 70(9): 3503-3510. DOI: 10.11949/0438-1157.20190211.
Jianmin LI, Qing YANG, Zhibin LIU, et al. Influences of Fe2+/Fe3+ and Mn2+ on total nitrogen removal and nitrogen transformations during low-oxygen aeration[J]. CIESC Journal, 2019, 70(9): 3503-3510. DOI: 10.11949/0438-1157.20190211.DOI:
To quickly realize the autotrophic denitrification of actual domestic sewage in the short term
the activated sludge from the actual sewage treatment plant containing anammox bacteria was used to study the removal effect of nitrogen in the process of hypoxia aeration for Fe2+/Fe3+ and Mn2+. The results showed that both Fe2+/Fe3+ and Mn2+ can increase the abundance of anammox bacteria (AnAOB) in activated sludge
but Fe2+/Fe3+ had a certain inhibitory effect on ammonia oxidizing bacteria (AOB); therefore
the total inorganic nitrogen removal rate was 25% in the presence of Fe2+/Fe3+ under short-term dosing
but the total inorganic nitrogen removal rate was 44% in the presence of Mn2+. Nitrogen balance analysis showed that nitrogen transformation was mainly denitrification under the condition of Fe2+/Fe3+; but was mainly anaerobic ammonium oxidation (anammox) process under the condition of Mn2+. Therefore
the anammox activity could be enhanced in traditional activated sludge by short-term addition of Mn2+
promoting the removal of nitrogen during the low-oxygen aeration
and facilitating the rapid achievement of integrated autotrophic nitrogen removal.