Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung City, Taiwan.
Department of Civil and Environmental Engineering, University of Delaware, Newark, USA.
Environ Pollut. 2021 Jan 1;268(Pt B):115673. doi: 10.1016/j.envpol.2020.115673. Epub 2020 Sep 17.
The effect of pyrolysis temperature on the generation of polycyclic aromatic hydrocarbons (PAHs) in sewage sludge biochar (SSB) and the removal of hazardous chemicals from esturine sediments by SSB and sodium percarbonate (SPC), exemplified by 4-nonylphenol (4-NP) were studied. SSB synthesized at 500 °C (SSB500) achieved the highest 4-NP degradation efficiency of 73%, at pH 9.0 in 12 h of reaction time. The enhanced 4-NP degradation was attributed to the SSB500 activation activation of SPC that produced sufficient •OH and CO due to electron-transfer interaction on the Fe-Mn redox pairs. The microbial community diversity and composition of the treated sediment were compared using high-throughput sequencing. Results showed SSB/SPC treatment increased the microbial diversity and richness in the sediments. Proteobacteria were the keystone phylum, while Thioalkalispira genera were responsible for 4-NP degradation in the SSB/SPC treatment. Over all, results revealed the change in the bacterial community during the environmental applications of SSB, which provided essential information for better understanding of the monitoring and improvement of sustainable sediment ecosystems.
研究了热解温度对污水污泥生物炭（SSB）中多环芳烃（PAHs）生成的影响，以及 SSB 和过碳酸钠（SPC）对港湾沉积物中有害化学物质（以 4-壬基酚（4-NP）为例）的去除效果。在 pH 值为 9.0、反应时间为 12 小时的条件下，在 500°C 下合成的 SSB500 实现了最高的 4-NP 降解效率 73%。增强的 4-NP 降解归因于 SSB500 对 SPC 的激活，由于 Fe-Mn 氧化还原对的电子转移相互作用，SPC 产生了足够的 •OH 和 CO。通过高通量测序比较了处理后沉积物中的微生物群落多样性和组成。结果表明，SSB/SPC 处理增加了沉积物中的微生物多样性和丰富度。变形菌门是关键门，而硫碱螺旋菌属负责 SSB/SPC 处理中的 4-NP 降解。总的来说，结果揭示了 SSB 在环境应用过程中细菌群落的变化，为更好地理解监测和改善可持续沉积生态系统提供了必要的信息。
