沼液预处理玉米秸秆产沼气工艺参数优化  

Parameter optimization of corn staw anaerobic digestibility pretreated by biogas slurry

作　　者：王英琪 杨宏志[1] 孟海波 冯晶 魏程程[1] Wang Yingqi;Yang Hongzhi;Meng Haibo;Feng Jing;Wei Chengcheng(Collge of Food Science,Heilongjiang Bayi Agricultural University,Daqing 163319,China;Chinese Academy of Agricultural Engineering Planning and Design,Key Laboratory of Energy Resource Utilization from Agriculture Residue,Ministry of Agriculture and Affairs,Beijing 100125,China)

机构地区：[1]黑龙江八一农垦大学食品学院,大庆163319 [2]农业农村部规划设计研究院,农业农村部农业废弃物能源化利用重点实验室,北京100125

出　　处：《农业工程学报》2018年第23期239-245,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：“十三五”国家重点研发项目“农业废弃物厌氧发酵及资源化成套技术与设备研发”子课题“农业废弃物混合原料预处理技术研发”(2017YFD0800802-03)。

摘　　要：沼液作为厌氧发酵的废弃物处理存在困难,但沼液可以对秸秆类原料进行预处理,为沼液的综合利用提供可能。为优化沼液预处理玉米秸秆的条件,提高玉米秸秆厌氧消化产气量,该文以沼液预处理前后的纤维素、半纤维素、木质素含量以及产气量为指标,根据CCD(centralcompositedesign)试验设计原理,选取沼液添加比例、温度和时间为因素,建立三者之间的模型。试验结果表明:随着预处理TS(total solid)的降低,时间的延长,木质纤维素的降解率越高,而温度在30℃时木质纤维素的降解率达到最大。从产气量来看木质纤维素降解率并不是越高越好,过分的追求木质纤维素的降解会对产气量产生影响,经过响应面法优化产气量后得出最佳的预处理工艺为:沼液添加比例19.08%、预处理温度(30±1)℃、预处理时间为5 d,总产气量可提高30.76%。Under natural conditions,corn staw take a long time to start anaerobic digestion and decomposition due to its compact structure.Therefore,many studies have focused on the pretreatment of corn straws.At present,biogas slurry is difficult to treat after anaerobic fermentation.Pretreatment of corn straws with biogas slurry can reduce pollution and reduce the cost of pretreatment.The biogas slurry contains a large number of microorganisms,among which there are many degradable lignocellulose components.Pretreatment of corn straws with biogas slurry has become a research hotspot.This study aimed to optimize the parameter of pretreatment of corn straw with biogas slurry and to improve its anaerobic digestion gas production.The cellulose,hemicellulose,lignin content before and after pretreatment of biogas slurry and gas production were selected as indicators.According to the design principle of CCD(central composite design)experiment,the biogas slurry addation ratio(TS%),temperature and time were selected as factors.When the temperature was from 20 to 40℃,the biogas slurry addition ratio was 20%(based on total solid content)and the pretreatment time was 6 d,the cellulose degradation rate was 3.82%-9.27%,and the hemicellulose degradation rate was 13.05%-18.66%.At the same time,the lignin degradation rate was between 5.10%and 7.44%.The content of lignocellulose decreased from 72.41%to 63.44%at 30℃,and the degradation rate was 12.39%.When the temperature was set to 30℃and the pretreatment time was 6 d,the addition of biogas slurry was set between 10%and 30%(based on TS content).The cellulose degradation rate was from 6.72%to 9.68%,and the lignin degradation rate was between 1.91%and 7.75%.The degradation effect of hemicellulose was most obvious,ranging from 8.26%to 20.55%.The degradation rate of lignocellulose was ranged from 6.67%to 13.41%.Similarly,when the pretreatment time was between 2 and 10 d the temperature was 30℃,the biogas slurry addition ratio is 20%,the total degradation rate of lignocellulose is 8.19%t

关 键 词：沼气 消化 秸秆 沼液预处理 响应面 木质纤维素降解 产气量 

分 类 号：TK6[动力工程及工程热物理—生物能]