互花米草厌氧生物转化可行性分析与试验研究

Feasibility analysis and experiment of anaerobic digestion of Spartina alterniflora

针对互花米草这一广泛分布在中国海滩上的外来植物的资源化利用问题,通过对其生物结构的SEM观察,以及化学组成的测试分析,探讨了对其进行厌氧生物转化利用的可行性;同时,在35℃条件下采用批量发酵方式进行了厌氧发酵试验。结果表明:无论是从生物结构还是从化学组成来看,互花米草都具备作为厌氧发酵所需的基本条件,但其很高的Na元素含量(22683 mg/kg),以及高达58.45的C/N是其厌氧发酵面临的不利因素;互花米草可以顺利的进行厌氧发酵,试验条件下的原料产气率为251 mL/g TS,原料转化率为41.3%。因此,厌氧生物转化可以作为互花米草资源化利用的一条有效途径。

In order to transform Spartina alterniflora, an invasive species widely distributing on Chinese coast, into clean energy, the feasibility of anaerobic digestion of S. alterniflora was analyzed by its biological structure using the SEM and its chemical composition using the Elementor and ICP-AES, at the same time the anaerobic batch digestion experiments were carried out at 35 ℃. The results of structural observation and chemical composition analysis suggested that S. alterniflora possessed the elementary characteristics as anaerobic digestion feedstock, but its high sodium content （22683 mg/kg） and C/N ratio （58.45） could be the potential limiting factors to anaerobic digestion. The results of anaerobic digestion experiments show that S. alterniflora can be biodegradable and 251 ml/g TS of biogas yield and reduction of 41.3% in total solids were achieved. It can be concluded that S. alterniflora can be transformed into energy by anaerobic digestion.