不同生长期互花米草的理化特性及厌氧发酵特性

Characteristics of anaerobic digestion and physico-chemical properties of Spartina alterniflora at different growth stages

为了解不同生长阶段互花米草的理化特性及厌氧发酵性能,找出互花米草的最佳收获期,进行了不同生长阶段互花米草的中温厌氧消化试验。结果表明,随着生长期的延长,互花米草中易分解有机物含量下降,木质纤维素含量增加,木质纤维结构发育逐渐成熟,坚韧度增加,纤维素的结晶度提高,C/N增加,互花米草的可生物降解性能降低,但由于金属阳离子含量降低,对厌氧微生物产生抑制的风险降低。互花米草直接厌氧发酵的厌氧生物转化率较低,最高的为5月份采收的互花米草,为42.55%,最低的为11月份采收的互花米草,仅为18.76%。从互花米草生物量以及产气稳定性等角度综合考虑,选择8月份作为互花米草的最佳采收时期。

To assess the physico-chemical properties and the anaerobic biodegradability of S.alterniflora harvested at different growth stages,a wet mesophilic anaerobic experiment was performed.With the extension of growth period,the content of easily biodegradable organic matter decreased while lignocellulose content and C/N ratio increased,moreover,lignocellulosic structure became mature and the crystalinity of cellulose decreased which made the biodegradability of S.alterniflora decreased with the growth stage.However,the metal cations content decreased with the growth stage,it meant that the possibility of inhibitory to anaerobic digestion was decreased.The biotransformation rate was rather low when S.alterniflora was directly digested.The highest value of 42.55% was obtained when S.alterniflora was collected at May and the lowest value of 18.76% by August.Taking the biomass and the biogas stability into consideration,August is the optimum stage for harvest.