摘要
沼气发酵是废弃生物质资源化利用重要途径.沼气中通常含有1~12g/m3的H2S,对设备和管道有强烈的腐蚀性,因而脱硫对于沼气的高效利用有着重要意义.本试验分别以青草、稻草秸秆+餐余或稻草秸秆为沼气发酵原料,在不同的温度下探索微氧法原位沼气脱硫技术.结果表明:以青草为主要发酵原料的沼气中H2S质量浓度达到(11 087±1 060)mg/m3,秸秆沼气H2S质量浓度为(4 329±457)mg/m3;发酵系统导入微量氧气,H2S可被氧化成单质硫;在(35±1)℃条件下,通入理论量的2~4倍氧气时,青草沼气和秸秆沼气中的H2S去除率分别能达到93%和98%,此时沼气中残留的O2不高于0.5%,符合相关标准.沼气厌氧发酵系统引入微量的氧气对沼气产量和甲烷体积分数均没有明显的影响,不同发酵温度不影响沼气中残留H2S质量浓度.
Anaerobic digestion is one of the oldest and most widely used waste recycling processes. Biogas usually contains traces of H2S. H2S is highly non-desirable in energy-recovery processes and also highly corrosive. Desulfurization is very important for the efficient utilization of biogas. In this paper grass, straw ＋ refectory garbage or straw were used as fermentation feedstock to explore the feasibility of in-situ microaerobic desulfurization. The fermentation tests were carried out at different temperatures. The results show： a high hydrogen sulfide concentration（11 087±1 060） mg/ma was found when using grass as the main feedstock, whie it was only（4 329±457） mg/ma in straw biogas. Hydrogen sulfide could be oxidized into elemental sulfur by the introduction of oxygen. The average removal efficiency of hydrogen sulfide was 93% for straw biogas and 98% for grass biogas on the condition of 2 to 4 times of the theoretical oxygen demanded and temperature （35-＋-1） ℃. The remaining concentration of oxygen was less than 0. 5% meeting the standard. The introduction of micro-oxygen into fermentation system showed no obvious effect on the concentration of CH4 and the production of biogas. Different temperatures made no influence on the residual concentration of hydrogen sulfide.
作者
林春绵
章祎玛
叶媛媛
吴檬檬
LIN Chunmian ZHANG(College of Environment, Zhejiang Yima, YE Yuanyuan, WU Mengmeng University of Technology, Hangzhou 310014, China)
出处
《浙江工业大学学报》
CAS
北大核心
2017年第1期37-42,共6页
Journal of Zhejiang University of Technology
基金
中德合作项目-德国罗伯特.博世基金会(Robert Bosch Stiftung)基金资助项目(32.5.8003.0078.0)
关键词
沼气
秸秆
脱硫
微氧
biogas
straw
desulfurization
microaerobic
