Potential of plasma treatment as water reclamation process for irrigation

Abstract

A plasma-ozonation system was investigated as a possible method for the reclamation of pesticide contaminated water. A multi-wire to plate corona discharge in oxygen was used, operated in pulsed regime (110 ns full width at half maximum). The synthetic contaminated water contained 25 mg l−1 2,4-dichlorophenoxyacetic acid (2,4-D) in tap water. Complete degradation of 2,4-D and over 90% mineralization were achieved during treatment. The toxicity of the reclaimed water was assessed using seeds of Solanum lycopersicum, known to be sensitive to 2,4-D. It was found that plant growth was inhibited by the presence of the pesticide, however, the treatment reduced the toxicity of the contaminated water. The plasma-ozonation method has proved thus far a good candidate for water reclamation for agriculture.

Machine Learning-Assisted Optimization of Microbubble-Enhanced Cold Plasma Activation for Water Treatment

“…Plasma-activated water (PAW) is water treated by cold plasma discharge. − As a green and chemical-free technology, PAW is gaining momentum in many industrial aspects due to its high efficiency and broad feasibility. − In terms of wastewater treatment, oxidative free radicals attack organic compounds such as PFOA and PFOS to achieve the degradation and mineralization of pollutants. − In biomedicine, PAW can achieve biofilm removal, would healing, and deactivation of viruses and be used in cancer therapy. , Moreover, the coupling of cold plasma and other techniques such as microwave may offer even more technology options in material synthesis . The activity of PAW is derived from the coupled effects of a low pH environment (the formation of nitric acid and its derivant) and the highly oxidative reactivity. − Moreover, due to the accumulation of nitrites and nitrates induced by the ionization of nitrogen, PAW is considered a liquid fertilizer to accelerate seed germination and plant growth in agricultural areas. , …”