Theoretical Investigation and Development of the Equipment for Producing and Preserving Low Salinity Electrolyzed Water
Date Issued
2010
Date
2010
Author(s)
Chong, Pei-Ru
Abstract
The purposes of this study were to investigated the properties of low salinity membrane-less electrolyzed water (LS-MLEW) and the operating conditions to generate such water. Electrolysis-current-efficiency was used as an index to evaluate the capability of system developed in producing free available chlorine (FAC). The electrical conductivity (EC) was used as another index for the determination of the salinity of potassium chloride solution (KCl).
Experimental results indicate that the EC value of electrolyzed water (EW) remains unchanged before and after the electrolysis process, thus making EC a suitable index for the control of salinity of EW. EW should be stored in low temperature, dark, and sealed conditions. For long-term storage, EW at pH equals 10 is better than pH equals 6. However, EW at pH equals 6 is better than pH equals 10 in terms of disinfection capability. In conclusion, it is better to use EW immediately after pH adjustment (from 10 to 6) to prevent dissipation of FAC.
The proper range of electrolyte concentration for generating LS-MLEW was 0.3?0.4 M. And the suitable temperature of electrolysis was 15?45oC. Cooling is required when developing LS-MLEW electrolysis equipments.
A system consists of LS-MLEW electrolysis component, salinity concentration adjustment component and pH-adjustment component was developed. The system can generate LS-MLEW (pH=6?6.5，FAC = 50 ppm，EC = 0.26 mS/cm）.
The system described above can produced EW in either batch type or continuous type. Both types were combined with ultrasonic atomizing component to develop two machines to be used for disinfection of indoor air.
Subjects
membrane-less electrolyzed water
EC
FAC
storage
disinfection
Type
thesis
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