NaOH和沼液浸泡预处理对麦糠厌氧发酵的强化作用比较

采用浓度分别为2%、4%、6%、8%的NaOH在80 ℃下预处理麦糠2 h,鸡粪和牛粪沼液在25 ℃下预处理麦糠5 d,比较NaOH和沼液浸泡预处理对麦糠厌氧发酵的强化作用。结果表明:6%NaOH获得最大产甲烷潜力,为199.5 mL/g,比对照组增加了191.2%(68.5 mL/g),且消化时间仅为6 d;鸡粪沼液的预处理效果明显优于牛粪沼液,最大产甲烷潜力达130.8 mL/g,相当于2%NaOH的预处理效果,但无需额外添加化学或生物等预处理药物。因此,在应用中可以根据实际情况,灵活选择2种预处理方式。

Comparison of enhancements of NaOH and liquid digestate soaking pretreatments for the anaerobic digestion of wheat husk

The enhancements of NaOH and liquid digestate soaking pretreatments for the anaerobic digestion of wheat husk were compared. Different concentrations of NaOH (2%, 4%, 6%, 8%) at 80 ℃ for 2 h were investigated, and the results showed that 6% NaOH treated wheat husk obtained maximum methane yield of 199.5 mL/g, which was 191.2% higher than untreated raw substance (68.5 mL/g),and the digestion time was only 6 days. The results showed that after 5 days of pretreatment of wheat bran with liquid digestate, the effect of liquid digestate from chicken manure was apparently superior to that from cattle manure, and the maximum methane yield reached 130.8 mL/g, being equivalent to that from 2% NaOH pretreatment, but without additional chemical or biological pretreatment drugs. Thus, the two pretreatment methods could be selected and applied flexibly according to the practical demand.