互花米草与土豆混合厌氧发酵产酸和产沼气特性（英）

研究了中温（35℃）批量发酵条件下互花米草与土豆VS配比分别为6∶1、7∶1和9∶1时混合厌氧发酵的产酸发酵和产沼气特性。试验结果表明：1）与互花米草单独发酵时的丙酸型产酸发酵不同，混合发酵的产酸发酵表现为丁酸型发酵；混合发酵时发酵液中总挥发性有机酸（TVFAs）的浓度比互花米草单独发酵时提高了1倍多；混合发酵时发酵液中各单一有机酸浓度依次为乙酸>丙酸>丁酸，而互花米草单独发酵时为丙酸>乙酸>丁酸；2）6∶1、7∶1和9∶1三种配比下的沼气产量分别为460、431和415 mL/g VS，比互花米草单独发酵时的361 mL/gVS分别提高了27.4%、19.3%和15.0%；3）6∶1、7∶1和9∶1三种配比下的沼气中的甲烷含量分别为60.3%、62.4%和62.7%，比互花米草单独发酵条件下57.4%的平均甲烷含量提高了大约3%～5%。总之，混合发酵显著改变了互花米草的产酸发酵特性，这些改变对促进互花米草的厌氧发酵和提高所产沼气的质量均具有积极的意义。

Characteristics of acidification fermentation and biogas production for co-digestion of Spartina alterniflora and potato

Influences of anaerobic co-digestion of Spartina alterniflora, a lignocellulosic material, and potato on acidification fermentation of S. alterniflora and its biogas production were investigated by anaerobic batch digestion experiments conducted at S. alterniflora to potato ratio of 6:1, 7:1 and 9:1 at 35 ℃. The results indicated that acidification fermentation for co-digestions was butyrate type compared with that of propionate type for mono-digestion of pure S. alterniflora, and the total volatile fatty acids (TVFA) concentrations for co-digestion increased more than twice compared with that of mono-digestion of pure S.alterniflora. The results also indicated that the cumulative biogas yields for co-digestion at SC∶P ratios of 6∶1, 7∶1 and 9∶1, respectively amounted to 460, 431 and 415 mL/g VS, increased by 27.4％, 19.3％ and 15.0％ than the 361 mL/g VS obtained in mono-digestion of pure S. alterniflora. In addition, the average methane contents of biogas produced in co-digestion at SC∶P ratios of 6∶1, 7∶1 and 9∶1 were 60.3％, 62.4％ and 62.7％, respectively, about 3％-5％ higher than 57.4％ in mono-digestion of pure S. alterniflora. It was concluded that great changes of VFAs were obtained for co-digestion compared with mono-digestion of pure S. alterniflora, and in general, these changes were beneficial to improve biogas production and biogas quality of S.alterniflora digestion.