Recent advancements in nanobubble water technology and its application in energy recovery from organic solid wastes towards a greater environmental friendliness of anaerobic digestion system
Journal
Renewable and Sustainable Energy Reviews
Journal Volume
145
Date Issued
2021
Author(s)
Abstract
Anaerobic digestion (AD) is an effective biological process to recover energy from organic solid wastes. There is a growing interest in utilization of renewable or sustainable bioenergy sources as future alternatives to fossil fuels. However, low hydrolysis rate, high heterogeneity of plant cell-wall structure of lignocellulose, process instability at high organic loading rate, and low metabolic activity of microbes limit the practical application of AD of organic solid wastes. A novel nanobubble water (NBW) based-AD system has been proposed to achieve enhanced methane production from typical organic solid wastes. This review summarizes the recent NBW studies, particularly on its utilization in AD processes and its stimulating effects on microorganisms and enzyme activities. The NBW generation approaches and its unique properties are firstly reviewed; then the roles of O2 in the O2-containing gas NBW in AD are also outlined and discussed. A deep insight into the feasibility of applying NBW-based AD system in the promotion of energy production from organic solid wastes is provided. Based on the reviewed literature works, the challenges and prospects of adopting the NBW-based AD system as a promising and sustainable technology for energy recovery from organic solid wastes are highlighted. ? 2021 Elsevier Ltd
Subjects
Anaerobic digestion; Environmental technology; Enzyme activity; Fossil fuels; Microorganisms; Petroleum prospecting; Recovery; Sustainable development; Anaerobics; Bio-energy; Environmental sustainability; Enzymes activity; Microaerobic environment; Microbial metabolism; Nano-bubble; Nanobubble water; Organic solid wastes; Water based; Metabolism
SDGs
Other Subjects
Anaerobic digestion; Environmental technology; Enzyme activity; Fossil fuels; Microorganisms; Petroleum prospecting; Recovery; Sustainable development; Anaerobics; Bio-energy; Environmental sustainability; Enzymes activity; Microaerobic environment; Microbial metabolism; Nano-bubble; Nanobubble water; Organic solid wastes; Water based; Metabolism
Type
review