イオン コウカン マク デンキ トウセキ ホウ ノ サッキン コウカ
Disinfection Mechanism of Electrodialytic Disinfection System
秋葉 道宏 島根大学生物資源科学部生態環境科学科
川口 明廣 神奈川県産業技術総合研究所
鈴木 喬 山梨大学工学部化学生物工学科
大矢 晴彦 横浜国立大学工学部物質工学科
Disinfection mechanism of electrodialyis system using ion exchange membranes has been investigated. One hundred minion (108) cens/cm3 of E. coli cells suspended in 0.1-0.6 M NaCl aqueous solution were passed through a desalting chamber at aflow rate of 3cm3/min at various current densities (0.27-1.63 A/dm2) in the visinity of the limiting current density (0.81A/dm2).
Intensities of electric field in the desalting chamber of each condition were calculated from measured values of electric potentials, and from the caluculated values relasionship between intensity of electric field and disinfection effbct were investigated.
In the both cases of changing current density and NaCl concentration, it was found that vaibility of cells percentage (%) decreased with an increase in the intensity of electric field. E. coli cells in suspension were found to be completely disinfected over the value of 2.30 V/cm in the electric field intensities. The result sug gest that disinfection effects of electrodialysis system were deeply concerned with intensities of the electric field.
Electric conductivity of a E. coli cell was caLiculated from measured electrolyte amount, weight and water content in the E. coli cells, and compared with that of solution in the desalting chamber using 0.1 M NaCl suspension at the current density of 1.35A/dm2 where electric field strength was 2.30V/cm. From the experiment, it was cleared that electric conductivity(0.248S/cm)of the E. coli cell was about four time as large as that (0.0057S/cm) of NaCl solution in the desalting chamber.
Taking the results in to account'it was concluded that the disinfection mechanism of electrodialysis system is an electrochemical electric conduction effbct in the surface and inside of E. coli cells, over the condition of limiting current density (0.81A/dm2).
ニホン カイスイ ガッカイ
The Society of Sea Water Science, Japan