Ca(OH)_2预处理对水稻秸秆沼气产量的影响(英文)

Effect of Ca(OH)_2 pretreatment on biogas production of rice straw fermentation

生物质材料经碱预处理后的发酵效率和甲烷产气量明显增加。为了提高预处理技术的经济效益及简化其工艺流程,利用自行设计的可控性恒温发酵装置,以秸秆为发酵原料,研究发酵沼液以及Ca(OH)2预处理对于水稻秸秆厌氧发酵产气量的影响。结果表明,与对照相比,沼液和Ca(OH)2预处理后的水稻秸秆木质素、半纤维素和纤维素含量显著降低,产气量明显提高。其中,Ca(OH)2预处理的产气量高于沼液预处理,8%浓度的Ca(OH)2下的秸秆产气量最高,为14374mL,比对照增加100.91%。该研究认为采用Ca(OH)2预处理水稻秸秆不仅简洁方便,成本低廉,而且具有较高的沼气产量,因此,可作为提高户用沼气产气效率的方法。

Previous studies had shown that the digestibility of the lignocellulosic biomass and methane yield were increased with alkali pretreatment prior to anaerobic fermentation. To increase the economic viability of pretreatment technology and simplify operation, a self-designed laboratory-scale continuous anaerobic biogas digester was used in this study. Anaerobically digested slurry, Ca（OH） 2 pretreatment, and anaerobic digestion were evaluated for biogas production from rice straw. The results showed that the lignin, cellulose and hemicellulose of rice straw were significantly degraded, and all pretreatments promoted biogas production. The Ca（OH） 2 pretreatments exhibited higher biogas production than that of anaerobically digested slurry, and the highest biogas yield was obtained with 8% Ca（OH） 2 treatment, which reached up to 14 374 mL, 100.91% higher than that of the control. The results show that rice straw fermentation with Ca（OH） 2 pretreatment has the advantages of simple procedure, low cost and high biogas production. Therefore, pretreatment with lime can be applied in household biogasification of rice and other crop straws.