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Methane production from anaerobic co-digestion of sludge with fruit and vegetable wastes: effect of mixing ratio and inoculum type
Biomass Conversion and Biorefinery ( IF 3.5 ) Pub Date : 2020-06-04 , DOI: 10.1007/s13399-020-00785-z
Mahmoud Elsayed , Asmaa Diab , Mohamed Soliman

Methane production from wastes, like sewage sludge and fruit and vegetable wastes, has double benefits; first is minimizing these wastes and second is energy recovery. The goal of this research is to enhance methane yield from anaerobic co-digestion of primary sludge (PS) with fruit and vegetable wastes (FVW) in Egypt using different mixture and various inoculum types. Bio-chemical methane potential (BMP) tests were conducted in a 500-mL glass reactor under mesophilic conditions (35–37 °C). In the first BMP tests, six mixtures with PS to FVW ratios of 100:0, 70:30, 50:50, 30:70, 20:80, and 0:100 (based on volatile solids) were performed to obtain the best mixture for an optimal methane production. In the second BMP tests, three types of inoculum (fresh cow manure, activated sludge, and excess sludge) were used to identify the optimal inoculum for the greatest methane production. The highest methane yield was observed at PS to FVW ratio of 50:50 (141 mL/g VS), which was higher than the individual digestion of the other used feedstock. However, the minimum methane yield was recorded at PS to FVW ratio of 20:80. On the other hand, using the activated sludge as inoculum improved the methane yields from anaerobic co-digestion of PS with FVW compared with the other types of inoculum. Statistical analysis of the results was conducted using ANOVA test. The results conducted that the production of methane was improved by anaerobic co-digestion of PS with FVW and using the activated sludge as inoculum.



中文翻译:

污泥与果蔬废料厌氧共消化生产甲烷:混合比和接种物类型的影响

用废物(如污水污泥,水果和蔬菜废物)生产甲烷具有双重好处;首先是减少这些浪费,其次是能源回收。这项研究的目的是通过使用不同的混合物和不同的接种物类型,在埃及提高主要污泥与水果和蔬菜废物(FVW)厌氧共消化的甲烷产量。在中温条件下(35–37°C),在500 mL玻璃反应器中进行了生化甲烷潜力(BMP)测试。在最初的BMP测试中,对PS与FVW比率为100:0、70:30、50:50、30:70、20:80和0:100(基于挥发性固体)的六种混合物进行了测试,以获得最佳效果混合物以实现最佳甲烷生产。在第二次BMP测试中,接种物分为三种类型(新鲜牛粪,活性污泥,和过量的污泥)用于确定最大甲烷产量的最佳接种物。在PS与FVW的比例为50:50(141 mL / g VS)时,观察到最高的甲烷产率,这比其他使用过的原料的单独消化要高。但是,在PS与FVW的比率为20:80时记录了最低甲烷产量。另一方面,与其他类型的接种物相比,使用活性污泥作为接种物提高了PS与FVW厌氧共消化的甲烷收率。使用ANOVA检验对结果进行统计分析。结果表明,PS与FVW厌氧共消化并使用活性污泥作为接种物可改善甲烷的生产。这比其他使用过的原料的单独消化要高。但是,在PS与FVW的比率为20:80时记录了最低甲烷产量。另一方面,与其他类型的接种物相比,使用活性污泥作为接种物提高了PS与FVW厌氧共消化的甲烷收率。使用ANOVA检验对结果进行统计分析。结果表明,PS与FVW厌氧共消化并使用活性污泥作为接种物可改善甲烷的生产。这比其他使用过的原料的单独消化要高。但是,在PS与FVW的比率为20:80时记录了最低甲烷产量。另一方面,与其他类型的接种物相比,使用活性污泥作为接种物可提高PS与FVW厌氧共消化的甲烷收率。使用ANOVA检验对结果进行统计分析。结果表明,PS与FVW厌氧共消化并使用活性污泥作为接种物可改善甲烷的生产。使用ANOVA检验对结果进行统计分析。结果表明,PS与FVW厌氧共消化并使用活性污泥作为接种物可改善甲烷的生产。使用ANOVA检验对结果进行统计分析。结果表明,PS与FVW厌氧共消化并使用活性污泥作为接种物可改善甲烷的生产。

更新日期:2020-06-04
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