Effects of Aeration on Pollution Load and Greenhouse Gas Emissions from Agricultural Drainage Ditches
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials and Devices
2.2. Experimental and Analytical Methods
3. Results
3.1. Diurnal Variation of Nitrate/Ammonia Nitrogen and Related Indexes in the Studied Agricultural Drainage Ditch
3.2. Diurnal Variation of Physical and Chemical Properties of the Agricultural Drainage Ditch Sediment
3.3. Diurnal Variation of Greenhouse Gas Emission Fluxes from the Agricultural Drains
4. Discussion
4.1. Effect of Aeration on the Pollution Load of the Agricultural Drainage Ditch
4.2. Effect of Aeration on the Physical and Chemical Properties of the Drainage Ditch Sediment
4.3. Influence of Aeration on the Greenhouse Gas Emission Process of the Agricultural Drainage Ditch
4.3.1. Influence of Aeration on the N2O Emission Process of the Agricultural Drainage Ditch
4.3.2. Influence of Aeration on the CH4 Discharge Process in the Agricultural Drainage Ditch
4.3.3. Influence of Aeration on the CO2 Emission Process of the Agricultural Drainage Ditch
5. Conclusions
- (1)
- Aeration reduced the nitrate content in water, but had no significant effect on the ammonium content. Aeration increases the PH, DO and ORP of water, but reduces the COD of water by 24.9%, indicating that aeration has a certain purification effect on water quality.
- (2)
- At first, aeration greatly increased the content of ammonium nitrogen in the sediment, but as time went on there was no significant difference between ammonium nitrogen content and S treatment and, whether with S treatment or SP treatment, the content of nitrate nitrogen in the sediment was almost zero. The content of total organic carbon, microbial carbon and soluble carbon in sediments decreased with SP treatment and the final content was less than that of S treatment.
- (3)
- Aeration reduces the emission fluxes of N2O and CH4 and increases the emission fluxes of CO2 in the drainage ditch. However, it reduces the greenhouse effect generated by the drainage ditch by 33.66%, among which the emission fluxes of CH4 decrease the most (by 46.28%). The DO content and CH4 production in the water during the daytime were consistent with the trend of the temperature change. The higher the temperature, the greater the CH4 production, the higher the DO in water and the more CH4 oxidation.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Type of Gas | The Emission Flux (mg/m2) | GWP | The Decrease Ratio of GHG Emission Flux and Total GWP in SP Treatment Compared with S Treatment | ||
---|---|---|---|---|---|
S | SP | S | SP | ||
N2O | 1.04 | 0.8 | 309.92 | 238.4 | 23.19% |
CO2 | 8129.14 | 8914.44 | 8129.14 | 8914.44 | −9.66% |
CH4 | 1126.65 | 605.23 | 28,166.25 | 15,130.75 | 46.28% |
The total | 36,605.31 | 24,283.59 | 33.66% |
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Wu, J.; Zhang, Q.; Guo, C.; Li, Q.; Hu, Y.; Jiang, X.; Zhao, Y.; Wang, J.; Zhao, Q. Effects of Aeration on Pollution Load and Greenhouse Gas Emissions from Agricultural Drainage Ditches. Water 2022, 14, 3783. https://doi.org/10.3390/w14223783
Wu J, Zhang Q, Guo C, Li Q, Hu Y, Jiang X, Zhao Y, Wang J, Zhao Q. Effects of Aeration on Pollution Load and Greenhouse Gas Emissions from Agricultural Drainage Ditches. Water. 2022; 14(22):3783. https://doi.org/10.3390/w14223783
Chicago/Turabian StyleWu, Jingwei, Qisen Zhang, Chenyao Guo, Qiangkun Li, Yawei Hu, Xinman Jiang, Yanchao Zhao, Jing Wang, and Qiang Zhao. 2022. "Effects of Aeration on Pollution Load and Greenhouse Gas Emissions from Agricultural Drainage Ditches" Water 14, no. 22: 3783. https://doi.org/10.3390/w14223783
APA StyleWu, J., Zhang, Q., Guo, C., Li, Q., Hu, Y., Jiang, X., Zhao, Y., Wang, J., & Zhao, Q. (2022). Effects of Aeration on Pollution Load and Greenhouse Gas Emissions from Agricultural Drainage Ditches. Water, 14(22), 3783. https://doi.org/10.3390/w14223783