Method and apparatus for purification treatment of water

Abstract

A method for purifying water characterized in that a chamber is separated by a diaphragm into an anode section and a cathode section, a voltage is applied between the anode and the cathode while an oxygen-containing gas is supplied to the cathode section so as to generate a hypohaloric acid and hydrogen peroxide in the anode and cathode sections, respectively, and the water to be treated is first supplied to the anode section to be contacted with the hypohaloric acid and is then introduced to the cathode section to be contacted with the hydrogen peroxide.

1 . A method for purifying water wherein a chamber is partitioned into an anode section and a cathode section by a diaphragm, a voltage is applied between the anode and the cathode while an oxygen-containing gas is supplied to said cathode section so as to generate a hypohaloric acid and hydrogen peroxide in said anode section and said cathode section, respectively, and the water to be treated is first supplied to said anode section to be contacted with the hypohaloric acid and is then introduced to said cathode section to be contacted with hydrogen peroxide.  
     
     
         2 . A method for purifying water wherein a chamber is partitioned into an anode section and a cathode section by a diaphragm, a voltage is applied between the anode and the cathode while an oxygen-containing gas is supplied to said cathode section so as to generate a hypohaloric acid and hydrogen peroxide in said anode section and said cathode section, respectively, and the water to be treated which has been supplied to said anode section so as to be contacted with the hypohaloric acid is mixed with the water to be treated which has been supplied to said cathode section to be contacted with the hydrogen peroxide.  
     
     
         3 . A method for purifying water wherein a chamber is partitioned into an anode section and a cathode section by a diaphragm, a voltage is applied between the anode and the cathode while an oxygen-containing gas is supplied to said cathode section so as to generate a hypohaloric acid and hydrogen peroxide in said anode section and said cathode section, respectively, and the water to be treated which has been supplied to said anode section so as to be contacted with the hypohaloric acid is mixed with part of the water to be treated which has been supplied to said cathode section to be contacted with the hydrogen peroxide, followed by supplying the mixture to said cathode section again.  
     
     
         4 . The method according to  claim 1 ,  2 , or  3  wherein a carbon electrode is used as a cathode, a metal electrode is used as an anode, and a voltage of 1.5 V or higher and 20 V or lower is supplied therebetween.  
     
     
         5 . The method according to  claim 1 ,  2 , or  3  wherein the water to be treated contains a halogen ion in an amount of 0.01 to 1 mol/l.  
     
     
         6 . An apparatus for purifying water which comprises a chamber separated by a partition at least part of which is formed by a diaphragm, into an anode section provided therein with one or more anodes generating a hypohaloric acid by the application of a voltage and into a cathode section provided therein with one or more cathodes generating hydrogen peroxide by the application of a voltage wherein said anode section is provided with a supplying tube for supplying the water to be treated thereto and an introducing pipe for introducing the water treated in said anode section to said cathode section and said cathode section is provided with a supplying pipe for supplying thereto an oxygen-containing gas and a discharging pipe for discharging the water treated in said cathode section.  
     
     
         7 . An apparatus for purifying water which comprises a chamber separated by a partition at least part of which is formed by a diaphragm, into an anode section provided therein with one or more anodes generating a hypohaloric acid by the application of a voltage and into a cathode section provided therein with one or more cathodes generating hydrogen peroxide by the application of a voltage wherein said anode section is provided with a supplying pipe for supplying the water to be treated to the anode section and a discharging pipe for discharging the water treated in the anode section and said cathode section is provided with a supplying pipe for supplying the water to be treated to the cathode section, a supplying pipe for supplying an oxygen-containing gas to the cathode section, and a discharging pipe for discharging the water treated in the cathode section; and said discharging pipes of said anode and cathode sections are connected with a mixing bath provided with a discharging pipe for discharging the water purified in said bath.  
     
     
         8 . An apparatus for purifying water which comprises a chamber separated by a partition at least part of which is formed by a diaphragm, into an anode section provided therein with one or more anodes generating a hypohaloric acid by the application of a voltage and into a cathode section provided therein with one or more cathodes generating hydrogen peroxide by the application of a voltage wherein said anode section is provided with a supplying pipe for supplying the water to be treated to the anode section and a discharging pipe for discharging the water treated in the anode section and said cathode section is provided with a supplying pipe for supplying the water to be treated to the cathode section, a supplying pipe for supplying an oxygen-containing gas to the cathode section, and two discharging pipes for discharging the water treated in the cathode section; and said discharging pipe of said anode section is connected with one of said two discharging pipes of said cathode section and further connected with said supplying pipe for supplying the water to be treated into said cathode section.  
     
     
         9 . The apparatus for purifying water according to  claim 6 ,  7 , or  8  wherein a halogen ion adding bath is arranged at the prior stage of said apparatus.