零价铁与磁铁矿促进半干式猪粪厌氧产甲烷的效能与机理研究  

Effects and mechanisms of zero valent iron and magnetite on methane production from semi-dry anaerobic digestion of swine manure

作　　者：王媛媛 郑世超 黄文力[2] 黄薇薇 WANG Yuanyuan;ZHENG Shichao;HUANG Wenli;HUANG Weiwei(Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province,Hainan University,Haikou 570228;College of Environmental Science and Engineering,Nankai University,Tianjin 300350)

机构地区：[1]海南大学海南省农林环境过程与生态调控重点实验室,海口570228 [2]南开大学环境科学与工程学院,天津300350

出　　处：《环境科学学报》2022年第12期215-223,共9页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.52060005);天津市自然科学基金(No.19JCQNJC08600);天津大学-海南大学自主创新基金合作项目;海南大学D类高层人才人启动基金(No.KYQD(2R)1930)。

摘　　要：本实验探究了相同剂量(5 g·L^(-1))的零价铁、磁铁矿和两者的混合物对半干式猪粪厌氧消化过程的影响,重点揭示了零价铁和磁铁矿对甲烷生产的协同促进效能与机理.结果表明,与无添加剂的对照组相比,零价铁、磁铁矿和混合添加剂分别使系统的甲烷产量提高了32.8%、21.8%和35.1%.与单独添加零价铁或磁铁矿相比,混合添加剂对产甲烷的提升效果更佳.零价铁与磁铁矿对厌氧消化的协同促进效应体现在以下4个方面:(1)能更好地维持低氢气分压环境,推动产甲烷种间电子传递;(2)可使反应器的总碱度维持在相对较高的水平,提高系统缓冲能力;(3)能增加厌氧体系中溶解性铁离子浓度,进一步提高厌氧微生物的活性;(4)同时富集能够介导种间氢传递和种间直接电子传递的细菌和古菌,提高有机底物转化为甲烷的效率.The present study investigated the effects of zero valent iron(ZVI),magnetite and their mixture at a same dosage(5 g·L^(-1))on semi-dry anaerobic digestion of swine manure,with special focus on the synergetic effects and mechanisms of ZVI and magnetite on promoting methane production.Compared with the control group without any additive,the presence of ZVI,magnetite and their mixture significantly increased the methane yield by 32.8%,21.8%and 35.1%,respectively.Compared with sole ZVI or magnetite additive,their mixture showed a greater promotion effect on methane production performance.The synergetic effects of ZVI and magnetite on anaerobic digestion performance were summarized as follows:(1)maintained a lower hydrogen partial environment and enhanced interspecies electron transfer between syntrophic bacteria and methanogens;(2)increased the system buffering capacity by contributing to a higher total alkalinity level;(3)increased the concentration of total soluble iron and improved microbial activity,and(4)simultaneously enriched specific bacterial and archaeal species that mediating interspecies hydrogen transfer and direct interspecies electron transfer processes,contributing to a greater conversion efficiency of organic substrate to methane.

关 键 词：半干式厌氧消化 猪粪 零价铁 磁铁矿 甲烷 

分 类 号：X713[环境科学与工程—环境工程]