Chemical cleaning-associated generation of dissolved organic matter and halogenated byproducts in ceramic MBR : ozone versus hypochlorite
This study characterized the dissolved organic matter (DOM) and byproducts generated after the exposure of activated sludge to ozone and NaClO in ceramic MBR. It was found that NaClO triggered more significant release of DOM than ozone. Proteins with the molecular weight greater than 20 kDa and humi...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/138872 |
| _version_ | 1811685108224098304 |
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| author | Sun, Huifang Liu, Hang Han, Jiarui Zhang, Xiangru Cheng, Fangqin Liu, Yu |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Sun, Huifang Liu, Hang Han, Jiarui Zhang, Xiangru Cheng, Fangqin Liu, Yu |
| author_sort | Sun, Huifang |
| collection | NTU |
| description | This study characterized the dissolved organic matter (DOM) and byproducts generated after the exposure of activated sludge to ozone and NaClO in ceramic MBR. It was found that NaClO triggered more significant release of DOM than ozone. Proteins with the molecular weight greater than 20 kDa and humic acid like-substances were the principal components of DOM generated by NaClO, while ozone was found to effectively degrade larger biopolymers to low molecular weight substances. The results showed that more than 80% of DOM generated by NaClO and ozone could pass through the 0.2-μm ceramic membrane. Furthermore, total organic chlorine (TOCl) was determined to be the principal species of halogenated byproducts in both cases, while the generation of TOCl by NaClO was much more significant than that by ozone. Only a small fraction of TOCl was removed by the 0.2-μm ceramic membrane. More importantly, the toxic bioassays further revealed that the supernatant of sludge suspension and permeate in the MBR with NaClO cleaning exhibited higher developmental toxicity to the polychaete embryos than those by ozone. The results clearly showed that on-line chemical cleaning with ozone should be a more eco-friendly and safer approach for sustaining long-term membrane permeability in ceramic MBR. |
| first_indexed | 2024-10-01T04:39:17Z |
| format | Journal Article |
| id | ntu-10356/138872 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:39:17Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1388722020-05-13T07:57:47Z Chemical cleaning-associated generation of dissolved organic matter and halogenated byproducts in ceramic MBR : ozone versus hypochlorite Sun, Huifang Liu, Hang Han, Jiarui Zhang, Xiangru Cheng, Fangqin Liu, Yu School of Civil and Environmental Engineering Advanced Environmental Biotechnology Centre Nanyang Environment and Water Research Institute Engineering::Civil engineering Ceramic Membrane Bioreactor On-line Chemical Cleaning This study characterized the dissolved organic matter (DOM) and byproducts generated after the exposure of activated sludge to ozone and NaClO in ceramic MBR. It was found that NaClO triggered more significant release of DOM than ozone. Proteins with the molecular weight greater than 20 kDa and humic acid like-substances were the principal components of DOM generated by NaClO, while ozone was found to effectively degrade larger biopolymers to low molecular weight substances. The results showed that more than 80% of DOM generated by NaClO and ozone could pass through the 0.2-μm ceramic membrane. Furthermore, total organic chlorine (TOCl) was determined to be the principal species of halogenated byproducts in both cases, while the generation of TOCl by NaClO was much more significant than that by ozone. Only a small fraction of TOCl was removed by the 0.2-μm ceramic membrane. More importantly, the toxic bioassays further revealed that the supernatant of sludge suspension and permeate in the MBR with NaClO cleaning exhibited higher developmental toxicity to the polychaete embryos than those by ozone. The results clearly showed that on-line chemical cleaning with ozone should be a more eco-friendly and safer approach for sustaining long-term membrane permeability in ceramic MBR. 2020-05-13T07:57:46Z 2020-05-13T07:57:46Z 2018 Journal Article Sun, H., Liu, H., Han, J., Zhang, X., Cheng, F., & Liu, Y. (2018). Chemical cleaning-associated generation of dissolved organic matter and halogenated byproducts in ceramic MBR : ozone versus hypochlorite. Water research, 140, 243-250. doi:10.1016/j.watres.2018.04.050 0043-1354 https://hdl.handle.net/10356/138872 10.1016/j.watres.2018.04.050 29715648 2-s2.0-85047383858 140 243 250 en Water research © 2018 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Civil engineering Ceramic Membrane Bioreactor On-line Chemical Cleaning Sun, Huifang Liu, Hang Han, Jiarui Zhang, Xiangru Cheng, Fangqin Liu, Yu Chemical cleaning-associated generation of dissolved organic matter and halogenated byproducts in ceramic MBR : ozone versus hypochlorite |
| title | Chemical cleaning-associated generation of dissolved organic matter and halogenated byproducts in ceramic MBR : ozone versus hypochlorite |
| title_full | Chemical cleaning-associated generation of dissolved organic matter and halogenated byproducts in ceramic MBR : ozone versus hypochlorite |
| title_fullStr | Chemical cleaning-associated generation of dissolved organic matter and halogenated byproducts in ceramic MBR : ozone versus hypochlorite |
| title_full_unstemmed | Chemical cleaning-associated generation of dissolved organic matter and halogenated byproducts in ceramic MBR : ozone versus hypochlorite |
| title_short | Chemical cleaning-associated generation of dissolved organic matter and halogenated byproducts in ceramic MBR : ozone versus hypochlorite |
| title_sort | chemical cleaning associated generation of dissolved organic matter and halogenated byproducts in ceramic mbr ozone versus hypochlorite |
| topic | Engineering::Civil engineering Ceramic Membrane Bioreactor On-line Chemical Cleaning |
| url | https://hdl.handle.net/10356/138872 |
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