论文部分内容阅读
以猪粪及碱液预处理后的玉米秸秆为原料,在恒温35℃和料液总固体质量分数为5%的条件下,以实验室内培养的不产气厌氧活性污泥为接种物,研究猪粪与玉米秸秆不同配比(干物质比分别为1∶3、1∶2、1∶1、2∶1、3∶1和0∶1(单一猪粪))混合发酵对产气效果的影响。研究结果表明,在35℃条件下,猪粪与玉米秸秆以2∶1配比的累积产气量最大,为15 157 mL;其次是1∶1样品,累积产气量为15 088 mL。但甲烷产量最高为1∶1样品,56 d共产甲烷9 137 mL,甲烷气占总产气量的60.6%。通过对发酵过程中pH及COD的测定,证明经碱液预处理后的玉米秸秆能与猪粪混合稳定发酵,发酵前后厌氧消化液中COD的降解率可达50%以上。进一步研究分析得出,将玉米秸秆和猪粪按一定比例混合发酵不仅可以缩短发酵周期、提高产气速率,而且可以大幅提升原料的产气潜力。
The pig manure and alkali pretreatment corn stalks as raw materials, at a constant temperature of 35 ° C and the total solids content of 5% under the conditions of laboratory culture of non-anaerobic activated sludge as inoculum , Pig manure and corn stover different proportions (dry matter ratio were 1: 3, 1: 2, 1: 1, 2: 1, 3: 1 and 0: 1 Effect of effect. The results showed that at 35 ℃, pig manure and corn stalk had the largest cumulative gas production of 15 157 mL at a 2: 1 ratio, followed by a 1: 1 sample with a cumulative gas production of 15 088 mL. However, the highest methane yield was 1: 1, with 9 137 mL of methane on 56 d and 60.6% of methane on the whole. Through the determination of pH and COD in the fermentation process, it was proved that the corn stalks pretreated with lye can be mixed and stably fermented with pig manure, and the COD degradation rate in the anaerobic digestion liquor before and after fermentation can reach more than 50%. Further study and analysis showed that corn straw and pig manure by a certain percentage of mixed fermentation can not only shorten the fermentation cycle, increase gas production rate, but also can significantly enhance the gas production potential of raw materials.