Abstract：
The impact of NaOH-modified biochar on the release of NH3 and H2S from laying hens\' manure was examined for 44 days, using a small-scale simulated aerobic composting system. The findings revealed that the NaOH-modified biochar reduced NH3 and H2S emissions by 40.63% and 77.78%, respectively, compared to the control group. Moreover, the emissions of H2S were significantly lower than those of the unmodified biochar group (p < 0.05). The increased specific surface area and microporous structure of the biochar, as well as the higher content of alkaline and oxygenated functional groups, were found to facilitate the adsorption of NH3 and H2S. This enhanced adsorption capability was the primary reason for the significant reduction in NH3 emissions. Furthermore, during the high-temperature phase of composting, there was a notable alteration in the microbial community. The abundance of Limnochordaceae, Savagea, and IMCC26207 increased significantly which aided in the conversion of H2S to stable sulfate. These microorganisms also influenced the abundance of functional genes involved in sulfur metabolism, thereby inhibiting cysteine synthesis, along with the decomposition and conversion of sulfate to sulfite. This led to a significant decrease in H2S emissions. This study provides valuable data for the selection of deodorizers in the composting process of egg-laying hens. The results have significant implications for the application of NaOH-modified biochar for odor reduction in aerobic composting processes.
摘要：
研究了NaOH改性生物炭对蛋鸡粪便中NH3和H2S释放的影响44天，使用小规模模拟好氧堆肥系统。研究结果表明，NaOH改性的生物炭减少了40.63%和77.78%的NH3和H2S排放，分别,与对照组相比。此外，H2S的排放量显著低于未改性生物炭组(p<0.05)。生物炭的比表面积和微孔结构增加，以及较高含量的碱性和含氧官能团，被发现有利于NH3和H2S的吸附。这种增强的吸附能力是NH3排放显著减少的主要原因。此外，在堆肥的高温阶段，微生物群落发生了显著的变化。丰富的荔枝科，Savagea,和IMCC26207显著增加，这有助于H2S转化为稳定的硫酸盐。这些微生物还影响了参与硫代谢的功能基因的丰度，从而抑制半胱氨酸合成，随着硫酸盐的分解和转化为亚硫酸盐。这导致H2S排放的显著减少。本研究为蛋鸡堆肥过程中除臭剂的选择提供了有价值的数据。该结果对NaOH改性生物炭在好氧堆肥过程中的气味减少应用具有重要意义。
