Enhanced carbon and nitrogen removal in an integrated anaerobic/anoxic/aerobic-membrane aerated biofilm reactor system

Abstract

A pilot-scale anaerobic/anoxic/aerobic-membrane aerated biofilm reactor (A2/O-MABR) system was constructed to enhance carbon and nitrogen removal.

Recent progress using membrane aerated biofilm reactors for wastewater treatment

“…Researchers also investigated the feasibility of incorporating MABR units into the aerobic zone with internal nitrate recycling (Figure 3(b)) (Sun et al 2020). With the aerobic MAB present in the aerobic zone, some bacteria capable of heterotrophic nitrification-aerobic denitrification, such as Thauera and Paracoccus, may facilitate the SND mechanism (Sun et al 2020).…”

“…Researchers also investigated the feasibility of incorporating MABR units into the aerobic zone with internal nitrate recycling (Figure 3(b)) (Sun et al 2020). With the aerobic MAB present in the aerobic zone, some bacteria capable of heterotrophic nitrification-aerobic denitrification, such as Thauera and Paracoccus, may facilitate the SND mechanism (Sun et al 2020). For enhanced biological phosphorus removal (EBPR) systems, an initial anaerobic zone can be added upstream for hydrolysis of particulate and colloidal substrates and volatile fatty acids (VFAs) uptake by polyphosphateaccumulating organisms (PAOs).…”

Enhancing Rubber Industry Wastewater Treatment through an Integrated AnMBR and A/O MBR System: Performance, Membrane Fouling Analysis, and Microbial Community Evolution

“…Integrated processes enhance the overall effectiveness of wastewater treatment by leveraging the strengths and mitigating the weaknesses of each individual method, leading to a more efficient system. Integrating anaerobic, anoxic, and aerobic processes in wastewater treatment offers enhanced efficiency, characterized by shorter HRTs, high resilience to load fluctuations, and reduced operational costs [ 8 , 9 , 10 ]. The development of an integrated anaerobic–aerobic system specifically for rubber industry wastewater was initiated by researchers using a two-stage UASB paired with a downflow hanging sponge (DHS) system.…”

Exploring the carbon and nitrogen removal capacity of a membrane aerated biofilm reactor for low-strength municipal wastewater treatment

“…Two latest pilot studies 7,8 placed the commercial ZeeLung oxygen-selective permeable hollow fiber membranes into an anoxic tank for the AAO process and achieved a high influent ammonia nitrogen loading rate of 10.7 and 4.9 g m −2 d −1 under very short hydraulic retention times (HRT) of 22 and 19 min but at the cost of low nitrification rates of 3.2 and 1.3 g m −2 d −1 (i.e., ammonia nitrogen removal of 30.1% and 27.3%), respectively. Another pilot study 9 placed the commercial Hydroking gas permeable hollow fiber membranes into an oxic tank for the AAO process and achieved similar performance to the existing AAO process and the benefits of a reduced internal and external recycle ratio. One-year operation of a full-scale MABR with ZeeLung modules immersed in an anoxic tank for the AAO process for municipal wastewater treatment in USA 10 demonstrated that the membrane provided an average oxygen transfer rate of 12 g m −2 d −1 with more than 80% for nitrification under a nitrification rate over 2.1 g m −2 d −1 , and nitrification was hardly affected by low temperature.…”