摘要
为解决秸秆和畜禽粪便等农业废弃物的资源化问题,以猪粪和麦秸为原料,以猪粪麦秸厌氧发酵后的沼渣制作的生物炭及其改性为手段,研究生物炭添加对秸粪混合物厌氧发酵的影响.结果表明,添加沼渣生物炭在促进种间电子转移和为微生物提供更多附着位点方面有重要作用,其中添加秸粪比为1:1,发酵系统含固率为8%的沼渣热解制备的生物炭的产气效果最好,甲烷产量较未添加生物炭的对照组提升了17.59%;利用尿素为氮源和纳米零价铁共改性以上生物炭,可大幅度提升生物炭比表面积和种间电子转移能力,其甲烷产量较对照组提升41.03%.同时,沼渣生物炭添加后,相较一般生物炭更大的孔容可吸附沼液中的部分挥发性脂肪酸,进而平衡系统的酸碱性;添加生物炭后,最大可吸附沼液中28.2%的铵态氮和35.01%的硝态氮,进而减少系统铵抑制和有望调节系统不平衡的碳氮比.沼渣生物炭及其改性是解决厌氧发酵甲烷产率较低的有效方法.
To address the resource utilization of agricultural wastes such as straw and livestock and poultry manure,this study investigated the effects of biochar addition on anaerobic digestion of a straw-manure mixture,using pig manure and wheat straw as raw materials.The biochar was devrived from the digestate obtained after anaerobic digestion of pig manure and wheat straw and its modification forms.The results showed that the addition of digestate-derived biochar played an important role in promoting electron transfer between species and providing more attachment sites for microorganisms.Specifically,biochar hydrolyzed with a manure-tostraw ratio of 1:1 and a solid content of 8% in the digestion system yielded the best gas production performance,increasing methane production by 17.59% compared to the control group without biochar.Furthermore,co-modification of this biochar with urea(as a nitrogen source)and nano zero-valent iron greatly enhanced its specific surface area and electron transfer capacity,leading to a 41.03% increase in methane production compared to the control.Additionally,the larger pore volume of digestate-derived biochar allowed it to adsorb volatile fatty acids from the digestate,thereby balancing the acidity and alkalinity of the system.The biochar also adsorbed up to 28.2% of ammonium nitrogen and 35.01% of nitrate nitrogen from the digestate,mitigating ammonium inhibition and potentially rectifying an imbalanced carbon-to-nitrogen ratio in the system.In conclusion,digestate-derived biochar and its modification represent an effective strategy for enhancing methane yield in anaerobic digestion systems.
作者
陈广银
刘旭
郑功勋
孙雨娟
葛广才
CHEN Guang-yin;LIU Xu;ZHENG Gong-xun;SUN Yu-juan;GE Guang-cai(Anhui Engineering Laboratory of Soil and Water Pollution Control and Remediation,Wuhu 241002,China;School of Ecology and Environment,Anhui Normal University,Wuhu 241002,China)
出处
《中国环境科学》
北大核心
2025年第11期6189-6198,共10页
China Environmental Science
基金
安徽高校协同创新项目(GXXT-2019-010)。
关键词
粪秸
沼渣生物炭
改性
纳米零价铁
厌氧发酵
manure straw
digestate biochar
modification
nano ZVI
anaerobic digestion
