Membrane and Water Treatment

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Enhanced nitrogen removal from high-strength ammonia containing wastewater using a membrane aerated bioreactor (MABR)

  • Arindam Sinharoy (Department of Environmental Science & Biotechnology, Jeonju University) ;
  • Ji-Hong Min (Department of Environmental Science & Biotechnology, Jeonju University) ;
  • Chong-Min Chung (Department of Environmental Science & Biotechnology, Jeonju University)
  • Received : 2024.04.12
  • Accepted : 2024.04.29
  • Published : 2024.04.25
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Abstract

This study evaluated the performance of a membrane aerated biofilm reactor (MABR) for nitrogen removal from a high-strength ammonia nitrogen-containing wastewater. The experimental setup consisted of four compartments that are sequentially anaerobic and aerobic to achieve complete nitrogen removal. The last compartment of the reactor setup contained a membrane bioreactor (MBR) to reduce sludge production in the system and to obtain a better-quality effluent. Continuous experiment over a period of 47 days showed that MABR exhibited excellent NH4+-N removal efficiency (99.5%) compared to the control setup without MABR (56.5%). The final effluent NH4+-N concentration obtained in the MABR was 2.99±1.56 mg/L. In contrast to NH4+-N removal, comparable TOC removal values in the MABR and the control reactor (99.2% and 99.3%, respectively) showed that air supply through MABR is much more critical for denitrification than for organic removal. Further study to understand the effect of air supply rate and holding pressure on NH4+-N removal in MABR revealed that an increase in both these parameters positively impacted reactor performance. These parameters are related to oxygen supply to the biofilm formed over the membrane surface, which in turn influenced NH4+-N removal in MABR. Among the two different strategies to control biofilm over the membrane surface, results showed that scouring for a duration of 10 min on a weekly basis, along with mixing air supply, could be an effective method.

Keywords

Acknowledgement

This work was carried out with the support of "Cooperative Research Program for Agriculture Science & Technology Development (Project No. 00219221)" Rural Development Administration, Republic of Korea.

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