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Anaerobic digestion of swine manure under natural zeolite addition: VFA evolution, cation variation, and related microbial diversity
Authors:Lin Lin  Chunli Wan  Xiang Liu  Zhongfang Lei  Duu-Jong Lee  Yi Zhang  Joo Hwa Tay  Zhenya Zhang
Institution:1. Department of Environmental Science and Engineering, Fudan University, 220 Handan Road, Shanghai, 200433, China
2. Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoidai, Tsukuba, Ibaraki, 305-8572, Japan
3. Department of Chemical Engineering, National Taiwan University, Taipei, 106, Taiwan
4. Department of Civil Engineering, Schulich School of Engineering, University of Calgary, 2500 University Drive NW, Calgary, Canada
Abstract:Batch experiments were carried out on anaerobic digestion of swine manure under 10 % of total solids and 60 g/L of zeolite addition at 35 °C. Four distinctive volatile fatty acid (VFAs) evolution stages were observed during the anaerobic process, i.e., VFA accumulation, acetic acid (HAc) and butyric acid (HBu) utilization, propionic acid (HPr) and valeric acid (HVa) degradation, and VFA depletion. Large decreases in HAc/HBu and HPr/HVa occurred respectively at the first and second biogas peaks. Biogas yield increased by 20 % after zeolite addition, about 356 mL/g VSadded with accelerated soluble chemical oxygen demand degradation and VFA (especially HPr and HBu) consumption in addition to a shortened lag phase between the two biogas peaks. Compared with Ca2+ and Mg2+ (100–300 mg/L) released from zeolite, simultaneous K+ and NH4 + (580–600 mg/L) adsorptions onto zeolite particles contributed more to the enhanced biogasification, resulting in alleviated inhibition effects of ammonium on acidogenesis and methanogenesis, respectively. All the identified anaerobes could be grouped into Bacteroidetes and Firmicutes, and zeolite addition had no significant influence on the microbial biodiversity in this study.
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