Studies on the generation and disinfection effects of electrolyzed strong acid water and Hi-ClO acid water
Date Issued
2005
Date
2005
Author(s)
Hsu, Ching-Yu
DOI
zh-TW
Abstract
The purposes of this study are two folds: First, to investigate on the disinfection capabilities of both hi-ClO water and strong acid water generated through electrolysis. Second, to identify the optimum operating condition of the prototype equipment developed for the generation of hi-ClO water. Hi-ClO water can be generated by providing direct current to water dissolved with NaCl, KCl, or CaCl2 when no filter between poles was used. When provided with filter between poles, strong acid water can be generated at the positive pole side. A prototype equipment, using graphite as the poles, was developed to produce hi-ClO water and a commercially available strong acid water generator, using titanium (Ti) as the poles, was used to generate strong acid water to be used in this study.
Fundamental studies on various voltages, working currents, distances between poles, concentrations and types of solvents were investigated during electrolysis process to generate hi-ClO and strong acid water. The pH, ORP and water temperature were measured during the electrolyzing process and the preservation of these factors of both water over the long period of time were also investigated.
The optimum operating condition and results of the electrolyzing process using NaCl water to generate 1 liter of hi-ClO water are as follow: 3 g of NaCl, 2 cm distance between poles, 6 V, electrolyzed for 15 min. The average working current is 0.625 A and the electricity consumed is 0.0009375 kwhr, the pH of the water is 5.2 and the ORP is -480 mV, temperature increase of the water is 0.3 degree C.
The disinfection capabilities of hi-ClO and strong acid water was tested on Xanthomonas campestris pv. campestris of carrot, Colletotrichum musae of banana and Penicillum italiucm of orange. Results showed that the newly generated strong acid water (pH < 2.7) and the same water after 20 days of storage have great disinfection capabilities on above 3 disease causing bacteria and fungi. The strong acid water can be used as the washing/cleaning water to provide better disinfecting capability during the post-harvesting process. However, due to its low pH value, this water can not be used accompanying irrigation/fertigation water. Hi-ClO water was not able to kill soft rod bacteria of carrot. As to other two bacteria, this water shows even better disinfecting performance over strong acid water. The pH of the hi-ClO water is in the range of 6 to 7, which allow us to use it together with the irrigation/fertigation water. The proper range of pH and the disinfection capability enable the hi-ClO water with great potential in reducing the amount of pesticides used in traditional agricultural practices as well as in organic culture.
Subjects
電解強酸水
電解次氯酸水
殺菌
disinfection
electrolyzed strong acid water
Hi-ClO acid water
Type
thesis
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