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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.