| 不同类型秸秆对污泥厌氧消化特性及细菌群落结构的影响 |
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| 引用本文： | 唐涛涛,李江,吴永贵,杨钊,陈瑀.不同类型秸秆对污泥厌氧消化特性及细菌群落结构的影响[J].环境科学研究,2019,32(11):1936-1944. |
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| 作者姓名： | 唐涛涛 李江 吴永贵 杨钊 陈瑀 |
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| 作者单位： | 贵州大学资源与环境工程学院,贵州 贵阳,550025;贵州大学资源与环境工程学院,贵州 贵阳 550025;贵州省喀斯特环境生态工程研究中心,贵州 贵阳 550025;贵州大学应用生态研究所,贵州 贵阳 550025 |
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| 基金项目： | 贵州省科技厅联合基金项目（No.黔科合LH字[2014]7652）；国家自然科学基金青年基金项目（No.51508120）；贵州省普通高等学校科技拔尖人才支持计划项目（No.黔教合KY字[2017]060） |
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| 摘 要： | 为促进污水处理厂污泥及农作物秸秆的资源化利用，探讨不同类型秸秆（玉米、小麦、水稻）对污泥厌氧消化特性、产气效果及细菌群落结构的影响，在中温〔（35±1）℃〕下，研究了污泥与秸秆按不同质量比（1:0、1:0.5、1:1、1:1.5）联合厌氧消化对污泥C/N（碳氮比）和厌氧消化环境中pH、ρ（NH4+-N）、ρ（VFAs）（VFAs为挥发性脂肪酸）、日均沼气产量及φ（CH4）、细菌群落的特征变化，以未添加秸秆的污泥厌氧消化为CK（对照）.结果表明:不同类型秸秆的添加对厌氧消化体系的pH、ρ（NH4+-N）、ρ（VFAs）均产生显著影响，秸秆的加入明显提高了厌氧消化体系的产气量.联合厌氧消化可通过优化厌氧消化底物的C/N，从而增加ρ（VFAs）和φ（CH4）.其中，污泥与玉米秸秆质量比为1:1.5时对厌氧消化的促进作用最为显著；其沼气日产量为2 303.08 mL，比CK（536.15 mL）提高了3倍以上，而沼气中φ（CH4）最高为54.49%，比CK（37.07%）提高46.99%.此外，不同类型秸秆的添加也可通过改变细菌群落结构从而促进秸秆降解，增加ρ（VFAs）和提高沼气产量，特别是添加秸秆后，Bacteroidetes会逐渐取代Proteobacteria成为主要的产酸菌种，从而导致ρ（VFAs）增加.研究显示，污泥与秸秆联合厌氧消化可改善污泥营养结构，改变细菌群落结构，提高沼气产量.
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| 关 键 词： | 秸秆 污泥 联合厌氧消化 细菌群落结构 |
| 收稿时间： | 2018/9/9 0:00:00 |
| 修稿时间： | 2018/11/16 0:00:00 |
Effects of Different Types of Straw on Sludge Anaerobic Digestion Characteristics and Bacterial Community Structure |
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| TANG Taotao,LI Jiang,WU Yonggui,YANG Zhao and CHEN Yu.Effects of Different Types of Straw on Sludge Anaerobic Digestion Characteristics and Bacterial Community Structure[J].Research of Environmental Sciences,2019,32(11):1936-1944. |
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| Authors: | TANG Taotao LI Jiang WU Yonggui YANG Zhao and CHEN Yu |
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| Affiliation: | 1.College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China2.Karst Eco-Environmental Engineering Research Center of Guizhou Province, Guiyang 550025, China3.Institute of Applied Ecology, Guizhou University, Guiyang 550025, China |
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| Abstract: | In order to enhance the resource utilization of activated sludge of sewage treatment plant and crop straw, the effects of different straw types (corn, wheat, rice) on sludge anaerobic digestion characteristics, biogas production and bacterial community structure during sludge digestion were investigated. Under moderate temperature conditions (35±1)℃, the anaerobic co-digestion of activated sludge and straw was carried out under different concentrations of organic matter (1:0, 1:0.5, 1:1, 1:1.5). Changes were discussed in sludge C/N (mass ratio) and pH, ρ(NH4+-N), ρ(VFAs), daily biogas production and φ(CH4), bacterial communities in anaerobic digestion environments, compared to anaerobic digestion of sludge without added straw as control (CK). The results showed that the addition of different types of straw had significant effects on the pH, ρ(NH4+-N) and ρ(VFAs) in the anaerobic digestion system. The addition of straw significantly increased the biogas production, and the anaerobic co-digestion increased ρ(VFAs) and φ(CH4) production by optimizing the sludge C/N. Among three types of straw used, corn straw had the most significant effect on anaerobic digestion under 1:1.5, and its average daily biogas production increased from 536.15 mL during sludge single digestion to 2303.08 mL and the maximal φ(CH4) of the co-digestion was 54.49%, 46.99% higher than sludge mono-digestion (which was only 37.07%). In addition, the addition of different types of straw can also improve straw degradation, increase ρ(VFAs) and the yield of biogas by changing the bacterial community structure. Especially with the addition of straw, Bacteroidetes will gradually replace Proteobacteria as the main acetogenic strain, which could increase ρ(VFAs). The co-digestion of sludge and straw can improve the nutrient structure of the sludge, change the bacterial community structure and increase the biogas production. |
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| Keywords: | straw sludge anaerobic co-digestion bacterial community structure |
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