Key Laboratory of New Materials and Facilities for Rural Renewable Energy of Ministry of Agriculture and Rural Affairs, College of Mechanical & Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China; Henan International Joint Laboratory of Biomass Energy and Nanomaterials, Henan Agricultural University, Zhengzhou 450002, China; Henan Collaborative Innovation Center of Biomass Energy, Henan Agricultural University, Zhengzhou 450002, China.
Key Laboratory of New Materials and Facilities for Rural Renewable Energy of Ministry of Agriculture and Rural Affairs, College of Mechanical & Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China; Henan International Joint Laboratory of Biomass Energy and Nanomaterials, Henan Agricultural University, Zhengzhou 450002, China; Henan Collaborative Innovation Center of Biomass Energy, Henan Agricultural University, Zhengzhou 450002, China.
Sci Total Environ. 2024 Jun 25;931:172885. doi: 10.1016/j.scitotenv.2024.172885. Epub 2024 Apr 30.
Nanobubble (NB) technology has gained popularity in the environmental field owing to its distinctive characteristics and ecological safety. More recently, the application of NB technology in anaerobic digestion (AD) systems has been proven to promote substrate degradation and boost the production of biogas (H and/or CH). This review presents the recent advancements in the application of NB technology in AD systems. Meanwhile, it also sheds light on the underlying mechanisms of NB technology that contribute to the enhanced biogas production from AD of organic solid wastes. Specifically, the working principles of the NB generator are first summarized, and then the structure of the NB generator is optimized to accommodate the demand for NB characteristics in the AD system. Subsequently, it delves into a detailed discussion of how the addition of nanobubble water (NBW) affects AD performance and the different factors that NB can potentially contribute. As a simple and environmentally friendly additive, NBW was commonly used in the AD process to enhance the fluidity and mass transfer characteristics of digestate. Additionally, NB has the potential to enhance the functionality of different types of microbial enzymes that play crucial roles in the AD process. This includes boosting extracellular hydrolase activities, optimizing coenzyme F, and improving cellulase function. Finally, it is proposed that NBW has development potential for the pretreatment of substrate and inoculum, with future development being directed towards this aim.
纳米气泡（NB）技术因其独特的特性和生态安全性在环境领域得到了广泛关注。最近，NB 技术在厌氧消化（AD）系统中的应用已被证明可以促进基质降解并提高沼气（H 和/或 CH）的产量。本综述介绍了 NB 技术在 AD 系统中应用的最新进展。同时，还探讨了 NB 技术增强有机固体废物 AD 中沼气产量的潜在机制。具体来说，首先总结了 NB 发生器的工作原理，然后对 NB 发生器的结构进行了优化，以适应 AD 系统对 NB 特性的需求。随后，详细讨论了添加纳米气泡水（NBW）如何影响 AD 性能以及 NB 可能产生的不同因素。作为一种简单环保的添加剂，NBW 通常在 AD 过程中用于增强消化液的流动性和传质特性。此外，NB 还有可能增强在 AD 过程中起关键作用的不同类型微生物酶的功能。这包括提高细胞外水解酶的活性、优化辅酶 F 以及改善纤维素酶的功能。最后，提出 NBW 在底物和接种物预处理方面具有发展潜力，未来的发展方向是朝着这一目标努力。
