添加零价铁联合热预处理强化牛粪与玉米秸秆共消化过程研究
Enhancement of co-digestion of cow manure and corn straw through zero-valent iron addition and thermal pretreatment
常昊 1尹志轩 1杨晨 1许玉星 1刘长青 1张文1
作者信息
- 1. 青岛理工大学 环境与市政工程学院,山东 青岛 266520
- 折叠
摘要
针对农业废弃物厌氧消化水解限速、产甲烷量低等问题,文章以牛粪和玉米秸秆为原料,经热预处理后在消化过程中投加不同剂量(4,8,12 mg/L)和不同粒径(微米级,纳米级)的零价铁(ZVI),探究其对农业废弃物共消化的强化作用.研究结果表明:投加适量的ZVI会对水解酸化和产甲烷过程产生促进作用,当投加 8 g/L微米级ZVI或 4 g/L纳米级ZVI时,可获得最高累积产甲烷量,分别比空白组提高了 20.7%和 29.5%;微米级ZVI和纳米级ZVI均可促进溶解性有机物的释放和丙酸向乙酸的转化;纳米级ZVI对水解酸化的促进作用强于微米级ZVI,但投加较多(8～12 g/L)纳米级ZVI会对产甲烷起负面作用;ZVI可促进Romboutsia,Saccharofer-mentans等水解酸化细菌和耗乙酸产甲烷菌Methanothrix的富集,对水解产酸和产甲烷过程起强化作用.
Abstract
To address the issues of restricted hydrolysis rate and low methane production in the anaerobic digestion of agricultural waste,zero-valent iron(ZVI)with different doses(4,8,12 mg/L)and particle size(micro-scale,nano-scale)was added during digestion after thermal pretreatment to investigate its enhancement of the co-digestion of cow manure and corn straw.The research indicated that the appropriate addition of ZVI promoted both the hydrolysis-acidification and methane production processes.The maximum cumulative methane yield was achieved with the addition of 8 g/L micro-scale ZVI or 4 g/L nano-scale ZVI,which increased by 20.7% and 29.5%,respectively compared with the control group.Micro-scale and nano-scale ZVI facilitated the release of dissolved organic compounds and the conversion of propionic acid to acetic acid.Nano-scale ZVI exhibited a stronger enhancement effect on hydrolysis and acidification than micron-scale ZVI.However,excessive doses(8,12 g/L)of nano-scale ZVI had an adverse effect on methane production.ZVI promoted the enrichment of hydrolytic acidogenic bacteria and acetotrophic methanogens,such as Romb outsia,Saccharofermentans and Methanothrix,which enhanced the processes of hydrolysis-acidification and methanogenesis.
关键词
零价铁/热预处理/农业废弃物/牛粪/玉米秸秆/共消化Key words
zero-valent iron/thermal pretreatment/agricultural waste/cow manure/corn straw/co-digestion引用本文复制引用
基金项目
国家重点研发计划项目(2020YFD1100303)
山东省省级环保产业研发项目(2060402)
出版年
2024
国家科技期刊平台
NSTL
万方数据