进料浓度对猪粪混合稻秆厌氧产甲烷特性的影响

桂伦; 陈莎莎; 黄振侠; 吁安; 姚健; 陈柳萌

文章摘要

进料浓度对猪粪混合稻秆厌氧产甲烷特性的影响

Effects of feedstock concentration on methane-producing performance of anaerobic co-digestion of pig manure and rice straw

Received:March 31, 2020

DOI：10.13254/j.jare.2020.0162

中文关键词: 猪粪，稻秆，进料浓度，混合发酵，产甲烷特性

英文关键词: pig manure, rice straw, feedstock concentration, co-digestion, methane-producing performance

基金项目:江西省重大研发专项（20182ABC28006）；江西省现代农业科研协同创新专项（JXXTCX201600304）；江西省重点研发项目（20171ACG70020）

Author Name	Affiliation	E-mail
GUI Lun	Institute of Applied Agricultural Microorganism, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China
CHEN Sha-sha	Institute of Applied Agricultural Microorganism, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China
HUANG Zhen-xia	Jiangxi Agricultural Ecology and Resource Protection Station, Nanchang 330046, China
YU An	Institute of Applied Agricultural Microorganism, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China
YAO Jian	Institute of Applied Agricultural Microorganism, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China
CHEN Liu-meng	Institute of Applied Agricultural Microorganism, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China	13931409@qq.com

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中文摘要:

为研究猪粪（Pig manure，PM）与稻秆（Rice straw，RS）的组配比例与进料的固形物（Total solid，TS）浓度对中温条件下厌氧产甲烷特性的影响，通过批次厌氧发酵试验摸清不同挥发性固体（Volatile solids，VS）配比（PM/RS=1：0、4：1、2：1、1：1、1：2、1：4、0：1）下的原料产甲烷规律，并选择VS配比（均以PM/RS计）为1：1、4：1的混合原料开展进料浓度（TS分别为4.6%、7.1%、9.6%、12.1%）梯度提升的连续厌氧发酵试验。结果表明：批次发酵试验中VS配比为4：1时产甲烷性能表现最好，产甲烷潜力（P值）、反应动力常数（k）、最大产甲烷速率（R_m）及甲烷产率达到峰值时间（t_max）分别为380.3 mL·g^-1 VS、0.098 d^-1、37.2 mL·g^-1 VS·d^-1、4.4 d。连续发酵试验中，在水力停留时间为30 d、VS配比为4：1时连续产甲烷性能更优，甲烷产率、产甲烷潜力转化率和容积产甲烷率分别达到354.8 mL·g^-1 VS、93.3%、0.88 L·L^-1·d^-1。但混合物料中猪粪比例越高，发酵系统的氨抑制风险也越高。在进料浓度达到12.1%条件下，VS配比为4：1时的游离氨浓度是VS配比为1：1时的1.47倍，达到223.2 mg·L^-1。研究表明，猪粪与稻秆混合原料VS配比为4：1（配比后的C/N=22~23：1）时，可提高发酵原料转化效率和容积产甲烷率；同时，进料TS浓度低于12.1%（有机负荷率为2.87 g VS·L^-1·d^-1）可降低厌氧发酵中的氨抑制，保证沼气工程稳定运行。

英文摘要:

To investigate the effects of total solid(TS) concentration on the methane-producing performance of the anaerobic co-digestion of pig manure(PM) and rice straw(RS), batch bottle tests were carried out at volatile solid(VS) ratios(PM/RS) of 1:0, 4:1, 2:1, 1:1, 1:2, 1:4, and 0:1. Furthermore, continuous fermentation experiments were carried out at feed concentrations of 4.6%, 7.1%, 9.6%, and 12.1% TS, with VS ratios of 1:1 and 4:1. The results showed that the methane-producing performance of VS ratios of 4:1 for the mixture of PM and RS was the best in batch bottle tests. The methane production potential(P-value), reactive power constant(k), the maximum rate of methane(R_m), and its arrival time(t_max) were 380.3 mL·g^-1 VS, 0.098 d^-1, 37.2 mL·g^-1 VS·d^-1, 4.4 d, respectively. When the hydraulic retention time was 30 d, the continuous methane production performance with VS ratios of 4:1 was better. In the continuous fermentation experiments, the specific methane production, methane potential conversion rate, and volume methane production rate were 354.8 mL·g^-1 VS, 93.3%, and 0.88 L·L^-1·d^-1, respectively; however, the higher the proportion of PM in the mixed materials, the higher the risk of ammonia inhibition. When the TS concentration reached 12.1%, the free ammonia concentration with a VS ratios of 4:1 was 1.47 times that of the VS ratios of 1:1, reaching 223.2 mg·L^-1. The results indicated that the VS ratios of 4:1(C/N=22~23:1) of the mixture of pig manure and rice straw can improve the conversion efficiency of fermentation raw materials and the yield of methane by volume. Concurrently, the feed concentration of TS was lower than 12.1%(organic load rate was 2.87g VS·L^-1·d^-1), which could reduce ammonia inhibition in the anaerobic fermentation and ensure the stable operation of biogas projects.

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