Co改性水热生物炭强化高浓度磺胺二甲嘧啶下的鸡粪厌氧消化

Enhanced Anaerobic Digestion of Chicken Manure Under High Concentration of Sulphamethazine by Co-modifi ed Hydrochar

在厌氧消化(AD)中添加水热炭(HC)是提升甲烷产量的有效方法。然而在复杂环境下,HC对AD的增益效率及机理尚不明确。本研究采用浸渍水热法制备出3种浓度的Co改性HC(Co-HC)。研究了Co-HC对高磺胺二甲嘧啶(SMZ)存在下的鸡粪AD效能及微生物演替的影响。结果表明,Co1.5-HC显著提高AD系统的甲烷产量(1.25倍)、酸化效率(1.5倍)和腐殖酸以及富里酸的分泌,并选择性富集了合养菌(Syntrophomonas、Mesotoga)和氢营养型产甲烷菌。综上,1.5mmol/L Co改性水热炭的综合性能最佳,这为水热炭对高抗生素浓度下畜禽粪污AD的协同增效提供理论基础及数据支撑。

The addition of hydrochar(HC)to anaerobic digestion(AD)is an effective method to enhance methane production.However,the efficacy and mechanism of HC for AD is not clear.In this study,the effects of Co-HC and microbial succession in the presence of high-sulphadiazine(SMZ)were investigated using hydrothermal Co-modified HC(Co-HC)at three concentrations.The results showed that Co1.5-HC significantly increased methane production(1.25-fold),acidification efficiency(1.5-fold),and secretion of humic acid as well as fulvic acid,selectively enriched synthrophic(Syntrophomonas,Mesotoga)and hydrogenotrophic methanogenic bacteria.In conclusion,1.5 mmol/L Co-HC had the best performance,which provides a theoretical basis and data support for the synergistic effect of HC on livestock manure at high antibiotic concentrations.