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<p>The problem with reusing waste hydroponic solutions containing valuable fertilizer residues is their contamination with microorganisms. This paper aims to investigate the potential of plasma treatment, compared to ultraviolet and ozonation, as a method for the disinfecting and preparing nutrient solutions for reuse. Waste hydroponic solutions were exposed prolonged ultraviolet and ozone using trivial devices, and above-solutions plasma using a pilot experimental setup of atmospheric corona discharges. Over 8&#xa0;h, ultraviolet increased in waste hydroponic solutions pH from 8.1 to 10.2, ozonation reduced in pH to 4.9, and plasma – to 4.0. The maximum electrical conductivity was achieved by plasma 710&#xa0;µS/cm versus ozone 650&#xa0;µS/cm and ultraviolet 502&#xa0;µS/cm. Plasma also resulted in highest percentage increase in total dissolved solids (90%) and oxidation–reduction potential (170%). Compared to ultraviolet and ozone, plasma showed highest nitrate (194&#xa0;mg/l), nitrite (40&#xa0;mg/l), and hydrogen peroxide (20&#xa0;mg/l) contents, but slowest temporal dynamics for bacterial inactivation (4 log CFU/ml in 20&#xa0;min) and fungal inactivation (100&#xa0;CFU/ml in 20&#xa0;min). Choice of waste hydroponic solutions treatment depends on the initial level of solution contamination and mineralization. Pilot plasma setup benefits (good reproducibility, scalable, simple design, straightforward operation with low costs) making it a promising and attractive technology for adoption by greenhouse operations to enable sustainable nutrient solution recycling.</p> Graphical abstract <p></p>

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Effect of plasma versus ultraviolet and ozone on electrochemical, antibacterial and antifungal properties of waste hydroponic solutions

  • 期刊论文

  • 发表日期：

    2026年7月11日

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  • A. Belov,
  • V. Storchevoy

摘要

The problem with reusing waste hydroponic solutions containing valuable fertilizer residues is their contamination with microorganisms. This paper aims to investigate the potential of plasma treatment, compared to ultraviolet and ozonation, as a method for the disinfecting and preparing nutrient solutions for reuse. Waste hydroponic solutions were exposed prolonged ultraviolet and ozone using trivial devices, and above-solutions plasma using a pilot experimental setup of atmospheric corona discharges. Over 8 h, ultraviolet increased in waste hydroponic solutions pH from 8.1 to 10.2, ozonation reduced in pH to 4.9, and plasma – to 4.0. The maximum electrical conductivity was achieved by plasma 710 µS/cm versus ozone 650 µS/cm and ultraviolet 502 µS/cm. Plasma also resulted in highest percentage increase in total dissolved solids (90%) and oxidation–reduction potential (170%). Compared to ultraviolet and ozone, plasma showed highest nitrate (194 mg/l), nitrite (40 mg/l), and hydrogen peroxide (20 mg/l) contents, but slowest temporal dynamics for bacterial inactivation (4 log CFU/ml in 20 min) and fungal inactivation (100 CFU/ml in 20 min). Choice of waste hydroponic solutions treatment depends on the initial level of solution contamination and mineralization. Pilot plasma setup benefits (good reproducibility, scalable, simple design, straightforward operation with low costs) making it a promising and attractive technology for adoption by greenhouse operations to enable sustainable nutrient solution recycling.

Graphical abstract