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Nitrogen removal augmentation of ship sewage by an innovative aerobic-anaerobic micro-sludge MBR technology

Cai, Yuhang, Ben, Teng, Zaidi, Asad A., Shi, Yue, Zhang, Kun
Process biochemistry 2019 v.82 pp. 123-134
Pseudomonas, Rhodobacter, chemical oxygen demand, denitrification, dominant species, fouling, membrane bioreactors, microbial communities, nitrification, nitrogen, pollutants, sewage, sewage treatment, sludge, total nitrogen, wastewater treatment
The implementation of latest International Maritime Organization (IMO) emission standard has raised stringent nitrogen requirements for marine domestic sewage discharge. In order to meet new discharge standards, novel aerobic-anaerobic micro-sludge membrane bioreactor (O-AMSMBR) for chemical oxygen demand (COD) and total nitrogen (TN) removal from ship sewage is proposed. Results indicated that novel MBR achieved better COD and TN removal efficiency (Ravg(COD) = 91.6% and Ravg(TN) = 88.07%). The amount of anaerobic sludge in O-AMSMBR was reduced by 80% however TN removal rate was 10% higher than traditional Membrane Bio-Reactors (MBRs) technology. Based on the analysis of sludge characteristics, high TN removal efficiency is achieved via collective role of simultaneous nitrification and denitrification (SND) and “anaerobic micro-sludge effect”. Microbial community analysis also revealed that Rhodobacter and Pseudomonas are dominant species in anaerobic zone, which has a direct relationship with “anaerobic micro-sludge effect”. Further, transmembrane Pressure (TMP) showed that “anaerobic micro-sludge effect” not only has a positive effect on pollutants removal but also can suspend membrane fouling. The outcomes of this study suggest that post-anaerobic integrated with micro-sludge methods played a vital role in keeping good pollutant degradation in ship wastewater treatment. The presented results can provide new insights into ship sewage treatment by MBR technology.