Biological Nitrogen Removal Performance and Its Influencing Factors of Activated Carbon Mediated-feammox
Anaerobic iron ammonia oxidation(Feammox)is an autotrophic nitrogen removal process that uses Fe3+as an electron acceptor.Activated carbon(AC)was used as an insoluble electron shuttle to increase the extracellular electron transfer rate of iron-reducing bacteria and enhance the feammox nitrogen removal efficiency.The effects of pH,dissolved oxygen,carbonate and sulfate concentrations on the performance of AC-mediated Feammox were investigated.The results showed that pH value 6～7 was conducive to promote the effluent NH4+-N removal efficiency.Intermittent aeration could promote Fe3+regeneration and enable continuous feammox denitrification.When the carbonate and sulfate concentrations were 250 mg/L and 150 mg/L,respectively,the removal rates of ammonia nitrogen and total nitrogen reached 94%and 91%,respectively.The feammox-enhanced constructed wetland achieved an ammonia nitrogen removal rate of 95%for rural domestic sewage,demonstrating micro-power and stable operation characteristics.
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