Evaluation of the Nitrous Oxide Emission Reduction Potential of an Aerobic Bioreactor Packed with Carbon Fibres for Swine Wastewater Treatment
Nitrous oxide (N2O) is a potent greenhouse gas that is emitted from wastewater treatment plants. To reduce emissions of N2O from swine wastewater treatment plants, we constructed an experimental aerobic bioreactor packed with carbon fibres (ca. 1 m3 bioreactor) as an alternative to conventional acti...
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doaj-55cb78a26c3345caae19ea281136e3672020-11-24T23:56:50ZengMDPI AGEnergies1996-10732019-03-01126101310.3390/en12061013en12061013Evaluation of the Nitrous Oxide Emission Reduction Potential of an Aerobic Bioreactor Packed with Carbon Fibres for Swine Wastewater TreatmentTakahiro Yamashita0Makoto Shiraishi1Hiroshi Yokoyama2Akifumi Ogino3Ryoko Yamamoto-Ikemoto4Takashi Osada5Animal Waste Management and Environment Division, NARO Institute of Livestock and Grassland Science, Tsukuba, Ibaraki 305-0901, JapanResearch Institute for Livestock Science, Okayama Prefectural Technology Center for Agriculture, Forestry and Fisheries, Misakicho, Okayama 709-3494, JapanAnimal Waste Management and Environment Division, NARO Institute of Livestock and Grassland Science, Tsukuba, Ibaraki 305-0901, JapanAnimal Waste Management and Environment Division, NARO Institute of Livestock and Grassland Science, Tsukuba, Ibaraki 305-0901, JapanInstitute of Science and Engineering, Kanazawa University, Kanazawa, Ishikawa 920-1192, JapanAnimal Waste Management and Environment Division, NARO Institute of Livestock and Grassland Science, Tsukuba, Ibaraki 305-0901, JapanNitrous oxide (N2O) is a potent greenhouse gas that is emitted from wastewater treatment plants. To reduce emissions of N2O from swine wastewater treatment plants, we constructed an experimental aerobic bioreactor packed with carbon fibres (ca. 1 m3 bioreactor) as an alternative to conventional activated sludge treatment. The N2O emission factor for the aerobic bioreactor packed with carbon fibres (CF) was 0.002 g N2O-N/g TN-load and the value for the typical activated sludge (AS) reactor was 0.013 g N2O-N/g TN-load. The CF treatment method achieved more than 80% reduction of N2O emissions, compared with the AS treatment method. The experimental introduction of a CF carrier into an actual wastewater treatment plant also resulted in a large reduction in N2O generation. Specifically, the N2O emission factors decreased from 0.040 to 0.005 g N2O-N/g TN-load following application of the carrier. This shows that it is possible to reduce N2O generation by more than 80% by using a CF carrier during the operation of an actual wastewater treatment plant. Some bacteria from the phylum Chloroflexi, which are capable of reducing N2O emissions, were detected at a higher frequency in the biofilm on the CF carrier than in the biofilm formed on the AS reactor.http://www.mdpi.com/1996-1073/12/6/1013carbon fibresdenitrificationnitrous oxide emissionswine wastewater |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Takahiro Yamashita Makoto Shiraishi Hiroshi Yokoyama Akifumi Ogino Ryoko Yamamoto-Ikemoto Takashi Osada |
spellingShingle |
Takahiro Yamashita Makoto Shiraishi Hiroshi Yokoyama Akifumi Ogino Ryoko Yamamoto-Ikemoto Takashi Osada Evaluation of the Nitrous Oxide Emission Reduction Potential of an Aerobic Bioreactor Packed with Carbon Fibres for Swine Wastewater Treatment Energies carbon fibres denitrification nitrous oxide emission swine wastewater |
author_facet |
Takahiro Yamashita Makoto Shiraishi Hiroshi Yokoyama Akifumi Ogino Ryoko Yamamoto-Ikemoto Takashi Osada |
author_sort |
Takahiro Yamashita |
title |
Evaluation of the Nitrous Oxide Emission Reduction Potential of an Aerobic Bioreactor Packed with Carbon Fibres for Swine Wastewater Treatment |
title_short |
Evaluation of the Nitrous Oxide Emission Reduction Potential of an Aerobic Bioreactor Packed with Carbon Fibres for Swine Wastewater Treatment |
title_full |
Evaluation of the Nitrous Oxide Emission Reduction Potential of an Aerobic Bioreactor Packed with Carbon Fibres for Swine Wastewater Treatment |
title_fullStr |
Evaluation of the Nitrous Oxide Emission Reduction Potential of an Aerobic Bioreactor Packed with Carbon Fibres for Swine Wastewater Treatment |
title_full_unstemmed |
Evaluation of the Nitrous Oxide Emission Reduction Potential of an Aerobic Bioreactor Packed with Carbon Fibres for Swine Wastewater Treatment |
title_sort |
evaluation of the nitrous oxide emission reduction potential of an aerobic bioreactor packed with carbon fibres for swine wastewater treatment |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2019-03-01 |
description |
Nitrous oxide (N2O) is a potent greenhouse gas that is emitted from wastewater treatment plants. To reduce emissions of N2O from swine wastewater treatment plants, we constructed an experimental aerobic bioreactor packed with carbon fibres (ca. 1 m3 bioreactor) as an alternative to conventional activated sludge treatment. The N2O emission factor for the aerobic bioreactor packed with carbon fibres (CF) was 0.002 g N2O-N/g TN-load and the value for the typical activated sludge (AS) reactor was 0.013 g N2O-N/g TN-load. The CF treatment method achieved more than 80% reduction of N2O emissions, compared with the AS treatment method. The experimental introduction of a CF carrier into an actual wastewater treatment plant also resulted in a large reduction in N2O generation. Specifically, the N2O emission factors decreased from 0.040 to 0.005 g N2O-N/g TN-load following application of the carrier. This shows that it is possible to reduce N2O generation by more than 80% by using a CF carrier during the operation of an actual wastewater treatment plant. Some bacteria from the phylum Chloroflexi, which are capable of reducing N2O emissions, were detected at a higher frequency in the biofilm on the CF carrier than in the biofilm formed on the AS reactor. |
topic |
carbon fibres denitrification nitrous oxide emission swine wastewater |
url |
http://www.mdpi.com/1996-1073/12/6/1013 |
work_keys_str_mv |
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