Development and Applications of Multifunctional Electrolysis Bactericidal Automatic System
Date Issued
2010
Date
2010
Author(s)
Kong, Shih-Wei
Abstract
A self-made batch type and a continuous type membrane-less electrolysis oxidizing water (EOW) generation systems were developed. Electrolysis current efficiency was used as the index to systematically investigate on various types of electrodes and electrolyte concentrations of solution. Both systems were capable of massively producing bactericidal water using titanium plate coated with platinum as the working electrodes and the saturated solution of NaCl as the operating concentration.
An acidity adjusting unit was developed to promote the bactericidal capability of EOW. The unit can be used in either electrolysis or chemical reaction types of hypochlorous acid (HOCl) producing procedures, in order to alter the weak alkalinity into weak acidity EOW, thus, increasing the proportion of HOCl without reducing free available chlorine (FAC) concentration. By doing so, the bactericidal capability can be improved and the corrosiveness of EOW can be reduced.
A model capable of simulating combination of components of free available chlorine (FAC) under various pH levels was developed and validated. This is the core technology of the reaction type HOCl producing procedure. A sensing device was developed capable of measuring 3 to 300 ppm FAC concentrations. The device can be used in the system developed in order to provide real time FAC information. The measuring time required is 1 minute which is not only much better than the traditional DPD method, but also better to the environment for there is no chemical agent or reagent required for the measurement.
The continuous type EOW system developed in this study was installed in a postharvest processing plant of Dounan Farmers’Association, Yunlin county of Taiwan. The aim was fulfilled to keep the FAC concentration of the water within the wet hopper, containing 4 tons of water, in the range of 30 ~ 50 ppm. Due to the periodic discharge of the polluted water, the daily usage of water is about 10 tons. At present, the bactericidal efficiency was 90%. The FAC concentration of the EOW can be higher and the acidity adjusting unit can be attached for future improvement.
The self-made EOW systems developed in this study were cheap in fixed cost and operating cost, the EOW generated has no harmful effects on people as well as environment. Thus, making the EOW much suitable for massive or wide area applications when compare with traditional chemical disinfectants. The EOW systems developed in this study can have great potential in medical, food processing, and bio-industrial applications.
Subjects
Membrane-less electrolysis water
Electrolysis
Free available chlorine
Hypochlorous acid
Ion exchange resin
Type
thesis
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