Key Laboratory of Agro-Environment in Downstream of Yangtze Plain and Key Laboratory for Crop and Animal Integrated farming of Ministry of Agriculture and Rural Affairs, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan.
Key Laboratory of Agro-Environment in Downstream of Yangtze Plain and Key Laboratory for Crop and Animal Integrated farming of Ministry of Agriculture and Rural Affairs, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212001, China.
Bioresour Technol. 2021 Jan;320(Pt B):124411. doi: 10.1016/j.biortech.2020.124411. Epub 2020 Nov 13.
Hydrochars-based dissolved organic matters (DOM) are easily available to organisms and thus have important influence on the biota once applying hydrochars as environment amendment. Thus, positive modifications on molecular composition of DOM is indispensable before hydrochars application. In this study, the impacts of microbial-aging by anaerobic fermentation on DOM of agro-waste-hydrochars was systematically assessed. Results revealed that microbial-aging caused lower DOM release but higher DOM molecular diversity. Moreover, microbial-aging resulted in the production of more biodegradable compounds, including lipids and proteins, and reduced the aromaticity of DOM. The highly oxygenated molecules (O/C > 0.6) were shifted into lower-order ones in the hydrochars-based DOM, suggesting the transformation of hydrophilic compounds into hydrophobic ones. Additionally, microbial-aging promoted the degradation of phenols by 99.0-98.9%, phenolic acids 37.8-73.5%, and polycyclic aromatic hydrocarbons by 83.4-90.4% in hydrochar-based DOM. Overall, this study demonstrates that microbial-aging changes the molecular characteristics of hydrochars-based DOM in a positive manner.
基于水热炭的溶解有机质（DOM）很容易被生物利用，因此一旦将水热炭作为环境改良剂应用，就会对生物区系产生重要影响。因此，在将水热炭应用之前，对 DOM 的分子组成进行积极的修饰是必不可少的。在本研究中，系统评估了厌氧发酵微生物老化对农业废弃物水热炭 DOM 的影响。结果表明，微生物老化导致 DOM 释放量降低，但 DOM 分子多样性增加。此外，微生物老化导致更多可生物降解的化合物的产生，包括脂质和蛋白质，并降低了 DOM 的芳香度。高度氧化的分子（O/C＞0.6）在水热炭基 DOM 中转化为低阶分子，表明亲水性化合物向疏水性化合物的转化。此外，微生物老化促进了水热炭基 DOM 中苯酚的降解（99.0-98.9%）、酚酸（37.8-73.5%）和多环芳烃（83.4-90.4%）。总的来说，本研究表明微生物老化以积极的方式改变了水热炭基 DOM 的分子特征。
