Comparison of long-term ceramic membrane bioreactors without and with in-situ ozonation in wastewater treatment: Membrane fouling, effluent quality and microbial community
| Autor: | Jiayang Li, Zhenghua Zhang, Xihui Zhang, Baoyu Ren, Shengyin Tang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Ceramics
Environmental Engineering Denitrification 010504 meteorology & atmospheric sciences Nitrogen 010501 environmental sciences Wastewater Membrane bioreactor 01 natural sciences Waste Disposal Fluid Bioreactors Ozone Environmental Chemistry Waste Management and Disposal Effluent 0105 earth and related environmental sciences Fouling Bacteria Sewage Chemistry Microbiota Membrane fouling Membranes Artificial Phosphorus Pulp and paper industry Pollution Ceramic membrane Activated sludge Sewage treatment Water Microbiology Filtration |
| Zdroj: | The Science of the total environment. 652 |
| ISSN: | 1879-1026 |
| Popis: | The comparison of long-term ceramic membrane bioreactors (MBRs) without and with in-situ ozonation was investigated in this study in terms of membrane fouling, activated sludge, effluent quality and microbial community in wastewater treatment. The optimal dosage of in-situ ozonation for long-term MBR operation was firstly determined as 5 mg/L (0.66 mg-ozone/g-mixed liquor suspended solid (MLSS)) with the optimal filterability of mixed liquor. During the long-term filtration experiment, MBR-ozone with in-situ ozonation demonstrated its significantly alleviated ceramic membrane fouling performance compared with MBR-control without in-situ ozonation as a result of the enhanced filterability of mixed liquor and organic foulants removal from membrane surface by in-situ ozonation oxidation. Furthermore, ozonation was beneficial to phosphorus removal and the total phosphorus (TP) concentration in effluent of MBR-control (0.82 ± 0.63 mg/L) was >2-fold higher than that of MBR-ozone (0.29 ± 0.41 mg/L). The improved phosphorus removal performance by ozonation was due to the increased abundance of phosphate accumulating bacteria of Candidatus Accumulibacter in activated sludge. However, ozonation was detrimental to nitrogen removal mainly as a result of the inhibition of denitrification with the decreased relative abundance of denitrification genus of Dechloromonas in activated sludge. Overall, ceramic MBR with in-situ ozonation had not only significantly alleviated membrane fouling but also remarkably improved phosphorus removal performance. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect