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Effects of combined ultrasonic and grinding pre-treatments on anaerobic digestion of vinegar residue: organic solubilization, hydrolysis, and CH4 production
Environmental Technology ( IF 2.8 ) Pub Date : 2021-01-28 , DOI: 10.1080/09593330.2020.1870572
Xin Kong 1, 2, 3 , Zafiry Defemur 2 , Mingkai Li 1 , Qiang Zhang 3 , Hua Li 1 , Xiuping Yue 2
Affiliation  

ABSTRACT

The high lignocellulose content of vinegar residues (VR) limits their biochemical methane potential (BMP) in anaerobic digestion (AD). However, unlike reported high cellulosic materials such as straw and grass, single pre-treatment with ultrasonication or grinding only slightly improved VR AD, due to the high protein and carbohydrate contents of VR. This study used statistical analysis to show that the methane yield, protein and polysaccharide release, and hydrolysis performance during VR AD were significantly enhanced with a combined grinding-ultrasound pre-treatment. Specifically, at 60 min of ultrasonic, the group with the combined pre-treatment (60 min + RS) showed the highest VR BMP (∼307.1 mLCH4/gVS), 68.7% greater than that in the control group. This group also exhibited optimal conditions for dissolution of polysaccharide and protein, with accumulated amounts of ∼500 and 1600 mg/L, respectively. The highest volatile fatty acid (VFA) concentration in the 60 min + RS group was 61.5% higher than that in the control group. Both dissolution and hydrolysis experiments suggested that ultrasound accelerated protein release from VR, particularly after the particle size was reduced, and that the grinding pre-treatment had a positive effect on polysaccharide release.



中文翻译:

超声和研磨联合预处理对醋渣厌氧消化的影响:有机溶解、水解和 CH4 的产生

摘要

醋渣 (VR) 的高木质纤维素含量限制了它们在厌氧消化 (AD) 中的生化甲烷潜力 (BMP)。然而,与报道的高纤维素材料(如稻草和草)不同,由于 VR 的蛋白质和碳水化合物含量高,单次超声预处理或研磨仅略微改善了 VR AD。本研究使用统计分析表明,联合研磨-超声预处理显着提高了 VR AD 过程中的甲烷产量、蛋白质和多糖释放以及水解性能。具体来说,在超声处理 60 分钟时,联合预处理组(60 分钟 + RS)显示出最高的 VR BMP(~307.1 mLCH 4/gVS),比对照组大 68.7%。该组还表现出多糖和蛋白质溶解的最佳条件,累积量分别为~500和1600 mg / L。60 min + RS 组的最高挥发性脂肪酸 (VFA) 浓度比对照组高 61.5%。溶解和水解实验都表明,超声加速了蛋白质从 VR 中的释放,特别是在粒径减小后,研磨预处理对多糖释放有积极影响。

更新日期:2021-01-28
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