Electrodialysis apparatus, waste water treatment method and fluorine treatment system

An electrodialysis apparatus comprising:

• an anode chamber having an anode;
• a cathode chamber having a cathode;
• a desalting chamber for removing target ions from water to be treated supplied to produce treated water having a lowered concentration of the target ions;
• a concentrating chamber for concentrating the target ions, which have moved from the desalting chamber, in the water to be treated to produce concentrated water having an increased concentration of the target ions;
• a buffer chamber for blocking the target ions in the water to be treated from flowing from the concentrating chamber directly into the anode chamber;
• a path for supplying pure water to the anode chamber;
• and
• a path for supplying at least part of effluent water from the anode chamber to the buffer chamber.

An electrodialysis apparatus comprising:

• an anode chamber having an anode;
• a cathode chamber having a cathode;
• a desalting chamber for removing first target ions and second target ions from water to be treated supplied to produce treated water having a lowered concentration of the first target ions and a lowered concentration of the second target ions;
• a first concentrating chamber for concentrating the first target ions, which have moved from the desalting chamber, in the water to be treated to produce first concentrated water having an increased concentration of the first target ions;
• a second concentrating chamber for concentrating the second target ions, which have moved from the desalting chamber, in the water to be treated to produce second concentrated water having an increased concentration of the second target ions;
• a path for supplying pure water to the anode chamber;
• and
• a path for supplying at least part of effluent water from the anode chamber to the first concentrating chamber.

An electrodialysis apparatus comprising:

• an anode chamber having an anode;
• a cathode chamber having a cathode;
• a desalting chamber for removing first target ions and second target ions from water to be treated supplied to produce treated water having a lowered concentration of the first target ions and a lowered concentration of the second target ions;
• a first concentrating chamber for concentrating the first target ions, which have moved from the desalting chamber, in the water to be treated to produce first concentrated water having an increased concentration of the first target ions;
• a buffer chamber for blocking the first target ions in the water to be treated from flowing from the first concentrating chamber directly into the anode chamber;
• a second concentrating chamber for concentrating the second target ions, which have moved from the desalting chamber, in the water to be treated to produce second concentrated water having an increased concentration of the second target ions;
• a path for supplying pure water to the anode chamber;
• and
• a path for supplying at least part of effluent water from the anode chamber to the first concentrating chamber.

An electrodialysis apparatus comprising:

• an anode chamber having an anode;
• a cathode chamber having a cathode;
• a desalting chamber for removing target ions from water to be treated supplied to produce treated water having a lowered concentration of the target ions;
• a concentrating chamber for concentrating the target ions, which have moved from the desalting chamber, in the water to be treated to produce concentrated water having an increased concentration of the target ions;
• a buffer chamber for blocking the target ions in the water to be treated from flowing from the concentrating chamber directly into the anode chamber;
• a path for supplying pure water to the buffer chamber;
• and
• a path for supplying at least part of effluent water from the buffer chamber to the concentrating chamber.

A waste water treatment system comprising:

• an anode chamber having an anode;
• a cathode chamber having a cathode;
• an electrode liquid tank for supplying pure water to the anode chamber and the cathode chamber;
• and
• a path for mixing at least part of effluent water from at least one of the anode chamber and the cathode chamber with water to be treated.

A waste water treatment system comprising:

• an electrodialysis apparatus for treating waste water containing fluorine;
• a detoxification apparatus;
• a path for supplying treated water from the electrodialysis apparatus to the detoxification apparatus and circulating between the electrodialysis apparatus and the detoxification apparatus;
• and
• a path for discharging the treated water from the electrodialysis apparatus.