Design of a continuous plasma activated water (PAW) disinfection system for fresh produce industry

IF 6.3 1区农林科学 Q1 FOOD SCIENCE & TECHNOLOGY

Innovative Food Science & Emerging Technologies Pub Date : 2024-10-01 DOI:10.1016/j.ifset.2024.103845

N.N. Misra , Tejas Naladala , Khalid J. Alzahrani , V.P. Sreelakshmi , P.S. Negi

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Abstract

This study introduces an innovative, industrial-scale continuous Plasma Activated Water (PAW) system, specifically designed for the fresh produce industry and optimized for micro to small enterprises. The system leverages a novel non-uniform electrode design to enhance average field strength, driving the efficient generation of reactive oxygen and nitrogen species (RONS) for steady-state PAW production. Key components include a venturi bubble generator for optimized gas-liquid interaction and a plasma reactor integrated with a continuous spray and drying setup, enabling consistent PAW production and application. Our preliminary results indicate about 1.5 log₁₀ CFU/g decrease in microbial load on treated produce, which further decreased to 2.5 log₁₀ CFU/g towards the end of storage life for tomatoes, with 20 kV applied to the reactors and a total residence time of 20 min. An evaluation of the maximum energy consumption of system indicated a process cost contribution of less than $0.5 per ton of treated produce. The promising initial results, scalable design, cost-effectiveness and sustainability aspects make this technology suitable for improving food safety while reducing chemical usage.

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设计用于新鲜农产品行业的连续等离子体活性水（PAW）消毒系统

本研究介绍了一种创新的工业规模连续等离子活化水（PAW）系统，该系统专为新鲜农产品行业设计，并针对微型至小型企业进行了优化。该系统利用新颖的非均匀电极设计来提高平均场强，推动活性氧和氮物种（RONS）的高效生成，从而实现稳态等离子活化水的生产。关键部件包括用于优化气液相互作用的文丘里气泡发生器，以及与连续喷雾和干燥装置集成的等离子反应器，从而实现了 PAW 的稳定生产和应用。我们的初步结果表明，在反应器电压为 20 千伏、总停留时间为 20 分钟的情况下，经过处理的农产品上的微生物量减少了约 1.5 log10 CFU/g，在西红柿贮藏期结束时，微生物量进一步减少到 2.5 log10 CFU/g。对系统最大能耗的评估表明，每处理一吨农产品的工艺成本不到 0.5 美元。良好的初步结果、可扩展的设计、成本效益和可持续性使该技术适用于提高食品安全，同时减少化学品的使用。

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来源期刊

Innovative Food Science & Emerging Technologies 工程技术-食品科技

CiteScore

12.00

自引率

6.10%

发文量

259

审稿时长

25 days

期刊介绍： Innovative Food Science and Emerging Technologies (IFSET) aims to provide the highest quality original contributions and few, mainly upon invitation, reviews on and highly innovative developments in food science and emerging food process technologies. The significance of the results either for the science community or for industrial R&D groups must be specified. Papers submitted must be of highest scientific quality and only those advancing current scientific knowledge and understanding or with technical relevance will be considered.