Biochar captures ammonium and nitrate in easily extractable and strongly retained form without stimulating greenhouse gas emissions during composting

IF 2.2 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Franziska Busch, Otávio dos Anjos Leal, Nina Siebers, Nicolas Brüggemann
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引用次数: 0

Abstract

During composting of organic waste, nitrogen is lost through gaseous forms and ion leaching. Biochar has been shown to capture mineral nitrogen (Nmin: NH4+ and NO3) from compost, which we hypothesize reduces N2O formation. However, associating Nmin captured by biochar with the dynamics of N2O and other greenhouse gas (GHG) emissions during composting remains unstudied and was the aim of this work. We composted (outdoor for 148 days) together kitchen scraps (43.3% dw, where dw is dry weight), horse manure (40.9% dw), and wheat (Triticum aestivum L) straw (15.8% dw) without (Control) or with biochar (Bc, 15% compost dw). The biochar consisted of hardwood and softwood pieces pyrolyzed at 680°C and exhibited 60% of particles with 4–8 mm. We monitored compost GHG (CO2, CH4, N2O) emissions, Nmin content in compost and biochar particles (sequential extractions), and biochar surface transformations (SEM-EDX and 13C-NMR spectroscopy) along composting. Biochar did not significantly reduce or increase GHG emissions and Nmin content (mg kg−1) in compost. However, the final NO3 amount (g compost pile−1) in the Bc treatment was significantly higher (54%) compared to the Control, indicating lower NO3 losses. Despite the high aromaticity and minimal contribution of carboxyl C to the biochar structure, biochar retained NH4+, mainly in easily extractable form (55%), in the first 2 weeks of composting and mainly in strongly retained form (75%) in the final compost. The NO3 content in biochar increased continuously during composting. In the final compost, the NO3 content extracted from biochar was 164 (37%, easily extractable), 80 (19%, moderately extractable), and 194 mg NO3–N kg−1 (44%, strongly retained). Although Nmin retention in biochar was not accompanied by lower N2O emissions, contradicting our hypothesis, we demonstrated the efficacy of biochar to recover Nmin from organic waste without stimulating GHG emissions.

Abstract Image

生物炭以易于提取和保留力强的形式捕获铵和硝酸盐,在堆肥过程中不会刺激温室气体排放。
在有机废物堆肥过程中,氮会以气态和离子浸出的形式流失。研究表明,生物炭可以捕获堆肥中的矿物氮(Nmin:NH4 + 和 NO3-),我们推测这可以减少一氧化二氮的形成。然而,将生物炭捕获的 Nmin 与堆肥过程中 N2O 和其他温室气体(GHG)的排放动态联系起来的研究仍未完成,这也是本研究的目的所在。我们将厨余(干重占 43.3%,干重指干重)、马粪(干重占 40.9%)和小麦(Triticum aestivum L)秸秆(干重占 15.8%)放在一起堆肥(室外堆肥 148 天),不加生物炭(Bc,堆肥干重占 15%)。生物炭由在 680°C 高温下热解的硬木和软木碎片组成,60% 的颗粒为 4-8 毫米。在堆肥过程中,我们监测了堆肥的温室气体(CO2、CH4、N2O)排放量、堆肥和生物炭颗粒中的 Nmin 含量(连续提取)以及生物炭的表面转化(SEM-EDX 和 13C-NMR 光谱)。生物炭并未明显减少或增加堆肥中的温室气体排放量和 Nmin 含量(毫克/千克-1)。不过,与对照组相比,生物炭处理的最终 NO3 - 量(克堆肥-1)明显较高(54%),表明 NO3 - 损失较低。尽管生物炭的芳香度很高,羧基 C 对生物炭结构的贡献很小,但在堆肥的前两周,生物炭主要以易提取的形式(55%)保留了 NH4 +,在最终堆肥中主要以强保留的形式(75%)保留了 NH4 +。在堆肥过程中,生物炭中的 NO3 - 含量持续增加。在最终堆肥中,从生物炭中提取的 NO3 - 含量分别为 164(37%,易提取)、80(19%,中等提取)和 194 mg NO3 -N kg-1(44%,强保留)。虽然生物炭中的 Nmin 保留率并没有随 N2O 排放量的降低而降低,这与我们的假设相矛盾,但我们证明了生物炭在不刺激温室气体排放的情况下从有机废物中回收 Nmin 的功效。
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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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