Membraneless electrodeionization method and system thereof, capable of directly exhausting oxygen gas and hydrogen gas outwards are

Abstract

The invention discloses a membraneless electrodeionization method and a system thereof, which are capable of directly exhausting oxygen gas and hydrogen gas outwards. A gas exhaust opening is connected with a gas exhaust valve; a spring, an upper porous support plate, an upper electrode, a water distributor with micropores, a lower electrode and a lower porous support plate are sequentially placed in an insulated cavity body from the top to the bottom; an outlet of the water distributor is connected with a water purification box via a water purification valve; ion exchange resin is filled between the two electrodes; the upper electrode is fixed on the lower surface of the upper porous support plate, and the lower electrode is fixed on the upper surface of the lower porous support plate; atop cover is sealed with a cylinder-shaped housing, and a bottom cover is sealed with the lower end surface of the cylinder-shaped housing; the upper porous support plate is sealed with the upper endsurface of the cylinder-shaped housing; and the two electrodes are respectively connected with a direct current power source. In a regeneration process, gas produced on the two electrodes is exhausted outwards from the two ends of a membraneless electrodeionization device, so that gas products cannot be accumulated in a resin layer. The membraneless electrodeionization method and the system thereof are suitable for the preparation of high purity water, the purification of electroplating and rinsing wastewater containing heavy metal ions, and the like, and the treatment of other water and wastewater, which aims for ionic impurity removal.

Description

technical field [0001] The invention relates to an electrodeionization method and system, in particular to an ion exchange membrane-free electrodeionization method and system in which hydrogen and oxygen generated on anode and cathode electrodes will not accumulate in a resin layer. technical background [0002] Electrodeionization (EDI) is a green deionization technology that only consumes electricity without consuming chemicals. Since Millipore Corporation of the United States first launched the commercial EDI device in 1987, EDI has been welcomed by users and its applications have increased day by day. Nowadays, EDI has been used in the preparation of high-purity water in industries such as electric power, semiconductor, medicine, chemical agent production, food and beverage. The quality of the effluent can reach the level of the traditional "mixed bed", or even better, which is beyond the reach of other environmentally friendly methods such as reverse osmosis, nanofiltr...

AI Technical Summary

Problems solved by technology

Due to the extremely poor conductivity of the bubbles, the resistance of the resin layer will increase significantly during the regeneration process, resulting in an increase in the regeneration voltage required per unit resin layer height, which wastes energy

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