Feammox based on the resource utilization of waste iron sludge and its mechanism

LI Hao; WANG Jin; MA Ding; FANG Jin-tao; YUE Zheng-bo

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China Environmental Science ›› 2023, Vol. 43 ›› Issue (10) : 5310-5319.

Solid Waste

Feammox based on the resource utilization of waste iron sludge and its mechanism

LI Hao, WANG Jin, MA Ding, FANG Jin-tao, YUE Zheng-bo

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Abstract

Lightweight sintered ceramsite were prepared using iron-carbon microelectrolysis sludge as raw material and filled in an anaerobic bioreactor. This process achieved the resource utilization of waste iron sludge and the anaerobic oxidation of low C/N wastewater. After 60 days of acclimation, the effluent water reached a stable state, with an average removal rate of NH₄⁺-N close to 100% and an average removal rate of TN of 14.19%. NH₄⁺-N was anaerobically oxidized in the reactor, and NO₃^--N became the main form of nitrogen in the effluent. Analysis of the Fe-N coupling mechanism in the reactor showed that biochemical processes such as organic hydrolysis, iron reduction, and NDFO reactions primarily occurred at the bottom, Feammox and NDFO reactions mainly occurred in the middle, and NDFO reactions mainly occurred at the top.

Key words

ammonia oxidation / Feammox / iron-carbon microelectrolysis sludge / low C/N wastewater / NDFO / resource utilization

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LI Hao, WANG Jin, MA Ding, FANG Jin-tao, YUE Zheng-bo. Feammox based on the resource utilization of waste iron sludge and its mechanism[J]. China Environmental Science. 2023, 43(10): 5310-5319

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