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Alkaline and co-digestion pretreatments: process optimization for enhancing the methane yield of Jatropha press cake
Biomass Conversion and Biorefinery ( IF 4 ) Pub Date : 2020-05-09 , DOI: 10.1007/s13399-020-00732-y
Gebresilassie Asnake Ewunie , John Morken , Zerihun Demrew Yigezu

Oil extraction and biodiesel production process produce a massive amount of by-products like Jatropha press cake (JPC) and crude glycerol (CG), which could be used as a potential substrate for methane production. However, the higher lignocellulosic and nitrogen content in the JPC act as a recalcitrant and inhibitor, respectivly, for microbes that are involved in the anaerobic digestion (AD) process. Therefore, the present study aimed to enhance the methane yield of JPC by optimizing the alkaline pretreatment and co-digestion process conditions. The effects of NaOH concentration, incubation temperature, and retention time on methane and soluble chemical oxygen demand (sCOD) yields were evaluated and modeled by employing a response surface methodology coupled with central composite design (RSM-CCD). Moreover, a series of batch experiments with various feedstock concentrations (FCs) were tested to investigate the methane yield of JPC when co-digested with CG at different levels. The methane yields of all pretreated samples were significantly higher when compared with these of the untreated JPC. Pretreating the JPC using 7.32% NaOH at 35.86 °C for 54.05 h was the optimum conditions for maximum methane increment of 40.23% (353.90 mL g−1 VS), while co-digesting 2% CG with JPC at 2 g VS L−1 FC enhanced the methane yield by 28.9% (325.47 mL g−1 VS). Thus, the methane yield of JPC was effectively increased by alkaline pretreatment and co-digesting with CG. However, the alkaline pretreatment was relatively more effective compared with the co-digestion process.



中文翻译:

碱性和共消化预处理:工艺优化以提高麻风树压滤饼的甲烷收率

石油开采和生物柴油生产过程会产生大量副产品,例如麻风树压滤饼(JPC)和粗甘油(CG),它们可用作甲烷生产的潜在底物。但是,对于参与厌氧消化(AD)过程的微生物,JPC中较高的木质纤维素含量和氮含量起着顽固和抑制作用。因此,本研究旨在通过优化碱性预处理和共消化工艺条件来提高JPC的甲烷产率。使用响应表面方法结合中心复合设计(RSM-CCD),评估和建模了NaOH浓度,孵育温度和保留时间对甲烷和可溶性化学需氧量(sCOD)产量的影响并进行了建模。此外,测试了一系列不同原料浓度(FCs)的批处理实验,以研究JPC与CG共同消化时在不同水平下的甲烷产率。与未处理的JPC相比,所有预处理样品的甲烷产率均明显更高。在35.86°C下使用7.32%NaOH预处理JPC 54.05小时是最大甲烷增量为40.23%(353.90 mL g-1 VS),同时在2 g VS L -1 FC下与JPC共同消化2%CG,从而使甲烷产率提高了28.9%(325.47 mL g -1 VS)。因此,通过碱预处理和与CG共消化可以有效提高JPC的甲烷产率。但是,与共消化过程相比,碱性预处理相对更有效。

更新日期:2020-05-09
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