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王明,赵胜雪,李旭荣,晏水平,袁巧霞,张衍林.猪粪中温半干法连续厌氧发酵产气性能[J].农业工程学报,2018,34(1):204-209.DOI:10.11975/j.issn.1002-6819.2018.01.028
猪粪中温半干法连续厌氧发酵产气性能
投稿时间:2017-09-24  修订日期:2017-12-08
中文关键词:    发酵  甲烷  农业废弃物  沼气
基金项目:中央高校基本科研业务专项资金资助(2662015QD034);公益性行业(农业)科研专项(201303099)
作者单位
王明 1.华中农业大学工学院农业部长江中下游农业装备重点实验室武汉 430000
 
赵胜雪 2. 八一农垦大学工程学院大庆 163000
 
李旭荣 1.华中农业大学工学院农业部长江中下游农业装备重点实验室武汉 430000
 
晏水平 1.华中农业大学工学院农业部长江中下游农业装备重点实验室武汉 430000
 
袁巧霞 1.华中农业大学工学院农业部长江中下游农业装备重点实验室武汉 430000
 
张衍林 1.华中农业大学工学院农业部长江中下游农业装备重点实验室武汉 430000
 
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中文摘要:为改善猪粪在连续型沼气工程中的容积产气效率和降低其进出料过程的热损失,该研究拟采用高浓度和小体积喂料方式进行,将新鲜猪粪分别稀释成总固体质量分数(total solid, TS)为10%、12%和14% 3个水平,通过逐级缩短水力停留时间(hydraulic retention time,HRT)(HRT:25 d→20 d→18.5 d)的方式来改变各组反应器的负荷。试验结果表明,当HRT:25 d时,各组平均日产气量均表现最高,约为460 mL/g,此阶段可获得85%以上的沼气转化效率;当HRT:20 d时,各组均获得最大容积产气率,最高达到2.29 L/(L·d)(TS:14%);当HRT下降至18.5 d时,各组产气量均呈下降趋势,表明有机负荷已超出反应器的最大转化能力。通过综合原料产气转化效率和容积产气效率2个指标,发现进料TS为14%和HRT为25 d为较优组合条件。该研究可为在实际沼气工程中如何协调进料浓度和HRT的关系提供参考。
Wang Ming,Zhao Shengxue,Li Xurong,Yan Shuiping,Yuan Qiaoxia,Zhang Yanlin.Biogas production performance of swine manure by mesophilic semi-dry continuous anaerobic digestion[J].Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE),2018,34(1):204-209.DOI:10.11975/j.issn.1002-6819.2018.01.028
Biogas production performance of swine manure by mesophilic semi-dry continuous anaerobic digestion
Author NameAffiliation
Wang Ming 1. Key Laboratory of Agriculture Equipment in Mid-lower Yangtze River, Ministry of Agriculture, College of Engineering Huazhong Agricultural University, Wuhan 43000, China
 
Zhao Shengxue 2. College of Engineering, Heilongjiang Bayi Agricultural University, Daqing 163000, China
 
Li Xurong 1. Key Laboratory of Agriculture Equipment in Mid-lower Yangtze River, Ministry of Agriculture, College of Engineering Huazhong Agricultural University, Wuhan 43000, China
 
Yan Shuiping 1. Key Laboratory of Agriculture Equipment in Mid-lower Yangtze River, Ministry of Agriculture, College of Engineering Huazhong Agricultural University, Wuhan 43000, China
 
Yuan Qiaoxia 1. Key Laboratory of Agriculture Equipment in Mid-lower Yangtze River, Ministry of Agriculture, College of Engineering Huazhong Agricultural University, Wuhan 43000, China
 
Zhang Yanlin 1. Key Laboratory of Agriculture Equipment in Mid-lower Yangtze River, Ministry of Agriculture, College of Engineering Huazhong Agricultural University, Wuhan 43000, China
 
Key words:manures  fermentation  methane  agricultural wastes  biogas
Abstract: In order to improve the volumetric gas production efficiency of pig manure in continuous biogas project and reduce the heat loss during its feeding and unloading process, the high concentration and small volume feeding method is adopted in this study. The total solid content (TS) of swine manure collected from dry cleaning mode is usually greater than 20%, and thus the manure can be used in not only wet but also the semi-dry or dry anaerobic digestion (AD). Previous reports showed that the dry AD mode can obtain better biogas production than wet AD process with a TS lower than 10%, and can also reduce the volume of dilution water and biogas slurry. Recently, Chinese government is pushing ahead the dry cleaning mode in the livestock and poultry farms, and thus there will be more and more "dry manure" with TS of above 20% produced from these farms. Therefore, it will be more necessary to study the semi-dry or dry AD process of swine manure. In present assay, a semi-continuous AD experiment up to 100 days was carried out to investigate the interaction between feedstock TS and the hydraulic retention time (HRT). There are 3 sets of reactors, and the feedstock TS is set as 10%, 12% and 14%, respectively. All the reactors start up from HRT of 25 d, and then the HRT is decreased to 20 and 18.5 d in step by step. The descent process of HRT will cause an increase of organic loading rate (OLR), and thus the reactor state and the biogas production will be influenced. The real-time biogas yield, volumetric biogas production rate (VBPR) and the buffer capacity of each reactor were investigated. The experimental results showed that all the 3 sets of reactors obtained a maximum biogas yield in the continuous AD test when they operated in the stage of HRT of 25 d, and there was no significant difference on the biogas yields among the 3 sets of reactors, around 460 mL/g which reached 86% of the maximum biogas yield of swine manure obtained from the batch AD process also carried out in present assay. The VBPR of each reactor reached the maximum value at the HRT of 20 d, and the highest VBPR of 2.29 L/(L·d) was observed at the TS of 14% and the HRT of 20 d. When the HRT decreased to 18.5 d, the biogas yield and the VBPR showed a larger reduction, mainly due to that the higher OLR had exceeded the bear capacity of these reactors. Moreover, the VFA/TA values were close to or exceeded 0.4 at HRT of 18.5 d, which suggested these reactors had a weaker buffer capacity at this time and might be running to the acidification. The optimum operating combination of feedstock TS and HRT could be selected by synthesizing the 3 factors of biogas yield, VBPR and the buffer capacity, and the feedstock TS of 14% and HRT of 25 d were recommended according to the present experimental results. The present study can provide a help to the practical biogas engineering for the matching of feedstock TS and HRT.
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