Xi Yonglan, Liu Yang, Ye Xiaomei, Du Jing, Kong Xiangping, Guo Dong, Xiao Qingbo
East China Scientific Observing and Experimental Station of Development and Utilization of Rural Renewable Energy, Ministry of Agriculture, Nanjing, China.
Laboratory for Agricultural Wastes Treatment and Recycling, Recycling Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing, China.
Front Bioeng Biotechnol. 2021 May 6;9:623594. doi: 10.3389/fbioe.2021.623594. eCollection 2021.
Trace metals are essential constituents of cofactors and enzymes and that their addition to anaerobic digesters increases methane production. Many trace elements are contained in herbal-extraction process residues (HPR). The present study concerns the effect of six kinds of HPR [Danshen root (Dr), Astragalus membranaceus (Am), Isatis root (Ir), (As), and Pseudo-ginseng (Pg)] that were used as additives, respectively, in the anaerobic digestion of wheat straw on biogas and methane production. The ratios of HPR residues/wheat straw [based on total solids (TS), of wheat straw] were 3, 5, and 10%, respectively. The digesters were at 37 ± 1°C of water bath during 30 days of anaerobic digestion. The results showed that HPR had significant effects on the anaerobic co-digestion. The highest biogas productivity was achieved when treated with 10% Pseudo-ginseng residues (PGR), which yielded 337 ml/g TS of biogas and 178 ml/g TS of methane. Cumulative production of biogas and methane increased by 28 and 37% compared to the production achieved in the control. These results suggest that PGR is an effective HPR to enhance the production of methane.
痕量金属是辅因子和酶的重要组成部分，向厌氧消化池中添加痕量金属可提高甲烷产量。草药提取过程残渣（HPR）中含有多种微量元素。本研究关注六种HPR[丹参（Dr）、黄芪（Am）、板蓝根（Ir）、（As）和三七（Pg）]分别作为添加剂在小麦秸秆厌氧消化中对沼气和甲烷产量的影响。HPR残渣与小麦秸秆的比例[基于小麦秸秆的总固体（TS）]分别为3%、5%和10%。在30天的厌氧消化过程中，消化池置于37±1°C的水浴中。结果表明，HPR对厌氧共消化有显著影响。用10%的三七残渣（PGR）处理时，沼气产量最高，产生了337毫升/克TS的沼气和178毫升/克TS的甲烷。与对照相比，沼气和甲烷的累计产量分别增加了28%和37%。这些结果表明，PGR是一种有效的HPR，可提高甲烷产量。
