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Enhanced biogas production of red microalgae via enzymatic pretreatment and preliminary economic assessment
Algal Research ( IF 5.1 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.algal.2020.101979
Ece Kendir Çakmak , Aysenur Ugurlu

Microalgal biomass is a promising candidate for biogas production, however; cell characteristics may prevent accessibility of anaerobic microorganisms to organic matter and limits methane production from microalgae. Pretreatments provide enhancement in methane yields via cell wall disruption and cell membrane solubilization. In this study, improvement of methane production from Porphyridium cruentum by enzymatic pretreatment was investigated. Enzymatic pretreatment at 55 °C showed the highest solubilization efficiencies. Protease, viscozyme, and enzyme mix pretreatment showed highest solubilization increases as 32.3%, 30.4%, and 30.5%, respectively. Highest methane improvements from P. cruentum were achieved after protease pretreatment with the highest dose (0.5 mL/g dry biomass) at both mesophilic (77% improvement) and thermophilic conditions (100% improvement). Modified Gompertz model results showed that lag phase was reduced and methane production rates were improved after enzymatic pretreatment. Preliminary economic assessment results showed that the cost of enzymes makes enzymatic pretreatment is not economically feasible due to critical cost of enzyme yet. However, production of low cost enzymes could facilitate the use of enzymes in pretreatment of microalgae and biogas production.



中文翻译:

通过酶促预处理和初步经济评估来提高红色微藻的沼气生产

然而,微藻生物质是沼气生产的有希望的候选者。细胞特性可能会阻止厌氧微生物接近有机物,并限制微藻产生甲烷。预处理可通过细胞壁破坏和细胞膜溶解作用提高甲烷产量。在这项研究中,研究了通过酶促预处理提高从十字花卟啉菌产生甲烷的能力。55°C的酶预处理显示出最高的增溶效率。蛋白酶,粘胶酶和酶混合物的预处理显示最高的增溶增加,分别为32.3%,30.4%和30.5%。P. cruentum对甲烷的最高改善在中温(改善77%)和嗜热条件(改善100%)下,以最高剂量(0.5 mL / g干生物质)进行蛋白酶预处理后,可实现较高的分离度。改进的Gompertz模型结果表明,酶预处理后,滞后相减少,甲烷生成速率提高。初步的经济评估结果表明,由于酶的关键成本,酶的成本使得酶法预处理在经济上不可行。然而,低成本酶的生产可以促进酶在微藻类和沼气生产的预处理中的使用。

更新日期:2020-07-01
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