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Cavitation-based technologies for pretreatment and processing of food wastes: Major applications and mechanisms – A review

食物垃圾 生物制氢 厌氧消化 空化 沼气 生物柴油 酯交换 废物管理 制浆造纸工业 生物燃料 原材料 食品工业 材料科学 工程类 化学 食品科学 甲烷 制氢 生物化学 有机化学 催化作用 物理 机械
作者
Zahra Askarniya,Xun Sun,Zhaohui Wang,Grzegorz Boczkaj
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:454: 140388-140388 被引量:37
标识
DOI:10.1016/j.cej.2022.140388
摘要

Conversion of food wastes to valuable products is an important topic for sustainable development. Feedstock hydrolysis is a stage strongly affecting the anaerobic digestion process, and resistance of food waste towards hydrolysis causes a decrease in product yield. Such as biomethane, biohydrogen, biohythane, VFAs, and lactic acids. Moreover, mass transfer is a serious limitation of transesterification for the production of biodiesel. Cavitation is a promising pretreatment method for the mitigation of these issues. This work presents a critical review on cavitation-assisted processing of food waste. In several studies, cavitation proved its remarkable potential. Cavitation can also be employed in anaerobic digestion reactors and directly irradiate microorganisms, stimulating enzyme activities. Cavitation led to an increase in SCOD by up to 172 %. Consequently, it caused an increase in biogas, biohydrogen, VFAs, and lactic acid converted from food waste by up to 100 %, 145 %, 100 %, and 62 %, respectively. Cavitation resulted in a reduction in reaction time required for the conversion of food waste into biodiesel by up to 98 % due to its potential in increasing mass transfer. In acoustic cavitation, the optimum power density for the conversion of food waste through anaerobic digestion is in ranges of 230–480 W/L and 40–50 W/L at pretreatment stage and main stage, respectively. Low frequencies in a range of 20–50 kHz are suitable for both anaerobic digestion and transesterification. However, studies on the application of high frequency are scarce and obvious “research-gap” in this field exists. In hydrodynamic cavitation, for disintegration, efficient cavitation number and pressure are in ranges of 0.07–0.15 and 2–4 bar, respectively. The maximum particle size reduction usually occurs within the initial 15 min for both types of cavitation.
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