菇渣的厌氧发酵特性

为提高菇渣的利用效率,以菇渣为发酵原料,在35 ℃下,进行初始干物质浓度为6%、8%、10%和12%的厌氧发酵,考察了初始干物质浓度对产甲烷性能及有机质降解的影响。结果表明:初始干物质浓度在10%时发酵效果最佳,此时累计产甲烷量、VS产气率和VS产甲烷率分别为4 034.71 mL、235.15 mL·g -1和134 mL·g -1,VS降解率为43.19%;菇渣的沼气产率与VS降解率成正比;淀粉、脂肪和蛋白质的降解率分别为99.01%、70.78%和17.16%;总纤维素的降解率为30.37%,以半纤维素降解为主。实验结果说明,菇渣具有较高的产气性能;产生的沼气主要来源于微生物对碳水化合物的降解。

Characteristics of anaerobic digestion of mushroom residue

In order to improve the application of mushroom residue for biogas production,it was digested anaerobically at 35 ℃ at 6%,8%,10%,and 12% of total solid substrate concentration,respectively.The effect of initial dry matter concentration on biogas yield and organic matter degradation was investigated.Our results indicate that the yield of cumulative methane(4 034.71 mL),the rate of gas production per volatile solid(235.15 mL·g-1),the rate of methane production per volatile solid(134 mL·g-1),and the degradation rate of mushroom residue(43.19%) were highest at an initial dry matter concentration of 10%.Furthermore,the production of biogas using mushroom residue as substrate was proportional to the degradation rate of the substrates used.The degradation rate of starch,fat,and protein were 99.01%,70.78% and 17.16%,respectively.The lignocellulose degradation rate was 30.37%,mainly from hemicellulose.These results illustrate that mushroom residue has a great potential for biogas production via microbial carbohydrate degradation.