牛粪液中添加硫酸盐减少甲烷排放。

IF 2.2 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Filipe Matos Pereira Lima, Mélodie Laniel, Hambaliou Balde, Robert Gordon, Andrew VanderZaag
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引用次数: 0

摘要

奶农对减少牛奶的碳足迹很感兴趣。减少甲烷(CH4)排放是实现这一目标的关键部分,而粪便是甲烷的重要来源。用于生产沼气的厌氧消化器等技术是有效的;然而,由于前期成本和基础设施需求,采用率放缓。实现短期减排需要能够迅速和广泛采用的低成本替代方案。先前的研究表明,通过添加硫酸(H2SO4)对粪便进行“酸化”可以抑制CH4的排放;然而,在农场处理酸的挑战可能会阻碍其广泛采用。这项实验室研究在24°C下进行了157天,并比较了硫酸盐基非酸性肥料(CaSO4)、两种酸化速率(pH值为bbb70和pH值为2SO4)和无硫酸盐酸(H3PO4)的效果。还分析了多种速率下CaSO4对甲烷的抑制作用。研究发现了两种抑制机制:酸化具有明显的早期效应,在40天内,H2SO4和H3PO4的累积CH4排放量分别降低了65%和54%,而含硫酸盐化合物在50天后的抑制作用增强。CaSO4和H2SO4的最终累积CH4抑制率分别为63%和91%,而H3PO4的抑制效果最差。这些结果表明H2SO4由于酸度和硫酸盐的结合而非常有效。单独添加硫酸(CaSO4)比单独添加酸(H3PO4)更有效。因此,以硫酸盐为基础的添加剂,如石膏,可能有望成为奶牛场的另一种短期解决方案,以大量减少甲烷。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Methane emission reduction by adding sulfate to liquid dairy manure

Methane emission reduction by adding sulfate to liquid dairy manure

Dairy farmers are interested in reducing the carbon footprint of milk. Reducing methane (CH4) emissions is a key part of this goal, and manure is a significant CH4 source. Technologies like anaerobic digesters for biogas production are effective; however, adoption rates are slowed by upfront costs and infrastructure needs. Achieving near-term emission reductions needs low-cost alternatives that can be quickly and widely adopted. Previous studies have shown that “acidification” of manure by adding sulfuric acid (H2SO4) suppressed CH4 emissions; however, widespread adoption may be hindered by the challenge of handling acid on farms. This laboratory study was performed for 157 days at 24°C, and compared the efficacy of a sulfate-based non-acidic fertilizer (CaSO4), and two rates of acidification, one at pH > 7 and one at pH < 7, for a sulfate-based acid (H2SO4) and a sulfate-free acid (H3PO4). Methane suppression by CaSO4 at multiple rates was also analyzed. Two mechanisms of suppression were observed: acidification had a demonstrable early effect, lowering cumulative CH4 emission within 40 days by up to 65% for H2SO4 and 54% for H3PO4, while sulfate-containing compounds showed increasing suppression after 50 days. Final cumulative CH4 suppression was up to 63% for CaSO4 and 91% for H2SO4, while H3PO4 was least effective. These results suggest H2SO4 is highly effective due to the combination of acidity and sulfate. Adding sulfate alone (CaSO4) was more effective than adding acid alone (H3PO4). Hence, sulfate-based additives—like gypsum—may hold promise as an alternative near-term solution for dairy farms to make large CH4 reductions.

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来源期刊
Journal of environmental quality
Journal of environmental quality 环境科学-环境科学
CiteScore
4.90
自引率
8.30%
发文量
123
审稿时长
3 months
期刊介绍: Articles in JEQ cover various aspects of anthropogenic impacts on the environment, including agricultural, terrestrial, atmospheric, and aquatic systems, with emphasis on the understanding of underlying processes. To be acceptable for consideration in JEQ, a manuscript must make a significant contribution to the advancement of knowledge or toward a better understanding of existing concepts. The study should define principles of broad applicability, be related to problems over a sizable geographic area, or be of potential interest to a representative number of scientists. Emphasis is given to the understanding of underlying processes rather than to monitoring. Contributions are accepted from all disciplines for consideration by the editorial board. Manuscripts may be volunteered, invited, or coordinated as a special section or symposium.
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