Biogas production from haophytes using modified anaerobic digester

盐生植物最近促使研究人员考虑将盐生植物作为植物修复的最终产物，作为沼气产生的来源。因此，采用厌氧消化工艺在土地高效利用、土壤修复、沼气生产等方面具有优势。在实验室规模的连续厌氧反应器中，考察了污泥停留时间分别为40天和80天时，高盐度生物质的厌氧消化效率。在中温气氛下运行两个反应器，其中一个反应器使用有机底物30g-Na+·L-1来自氯化钠，另一个反应器在碳酸氢钠和硫酸钠存在的情况下运行。根据前期从乌兹别克斯坦咸海盐碱地采集的30种野生盐生植物的元素分析结果，逐步培育出耐盐微生物，并选择了盐分浓度。在反应时间分别为40天和80天的条件下，氯化物体系可将进水中65.56%和60.42%的COD转化为甲烷气体。只有大约60%的进水COD转化为甲烷生产重碳酸盐，其余的气体作为硫酸盐还原细菌活性增加的最终产物分配给硫化物。这些结果表明，耐盐微生物可以培养，厌氧消化过程可以适应高盐度基质，这意味着植物修复最终产物的可生物降解性可以用于甲烷生产。

Halophytes has recently prompted researchers to consider using halophytes as a phytoremediation end-product as a source for biogas generation. Therefore, applying anaerobic digestion process is advantageous in terms of efficient land utilization, soil remediation, and biogas production. The anaerobic digestion efficiency of high saline biomass was investigated in continuous laboratory-scale anaerobic reactors at two different sludge residence times of 40 and 80 days. Under mesophilic atmosphere, two reactors were operated, one reactor used organic substrate with 30 g-Na+.L-1 originating from sodium chloride whereas the other was operated with the presence of sodium bicarbonate and sodium sulfate. The salt-tolerant microorganism was gradually developed and the salt concentrations were selected based on the elemental analyses results of 30 species of wild halophyte plants taken from the saline-affected area of the Aral Sea in Uzbekistan during the early phase of the operation. For 40 and 80 days of SRT, respectively, 65.56 percent and 60.42 percent of the feed COD were converted into methane gas by the chloride system. Only about 60% of the feed COD was converted into methane for bicarbonate, and the remaining fraction of gas was assigned to sulfide as a final product of increased sulfate reduction bacteria activity. These findings showed that the salt-tolerant microorganism could be incubated and the anaerobic digestion process could be adapted for a high-saline substrate, implying that the biodegradability of phytoremediation end-products may be used for methane production.