Total solution for water treatments

a technology of total solution and water treatment, which is applied in the direction of water/sewage multi-stage treatment, water/sewage treatment by oxidation, electrolysis components, etc. it can solve the problems of reducing the efficiency of ozone oxidation power consumption, jeopardizing the water quality of cdi treatment, and affecting the adhesion of active material deposited or plated film, etc., to achieve the effect of improving the efficiency of power consumption in ozone oxidation

Inactive Publication Date: 2007-11-29
GAINIA INTELLECTUAL ASSET SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]As described above, supercapacitor is a key component in making CDI energy effective, as well as allowing ozone formation on a small potential source. With quick charging and discharging property, supercapacitor can serve as a power amplifier and power buffer to deliver power needed at ozone oxidation and ion removal, as well as to store energy at FTC available for recuperation. An appropriate utilization of the effective energy of supercapacitor will further improve the efficiency of power consumption in ozone oxidation and CDI treatment.
[0012]A further aspect of the present invention is to integrate the flow-through ozone with CDI into O3 / CDI hybrid treatment system for purifying water in a continuous operation. After a simple filtration, all neutral contaminants existing in the intake water will be first oxidized by the on-line O3 reactor into gaseous and ionic products. The ion-loaded stream is then directed into the FTC units for ion removal to become potable, reusable, or dischargeable water. In the operation of O3 / CDI hybrid water treatment system, O3 will provide an oxidation equivalent to incineration to neutral substances and microorganisms, while CDI will adsorb all charged species with high recovery rate of water and lower power consumption. The O3 / CDI hybrid water treatment can singly remove both ionic and neutral species, the most abundant pollutants in water. No chemical is required for either O3 or CDI treatment, thus, no secondary pollution will incur.

Problems solved by technology

High current is beneficial to the ozone throughput, but it is detrimental to the adherence of the deposited or plated film of active material.
Obviously, incomplete flush of ions will jeopardize the water quality of CDI treatment.

Method used

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  • Total solution for water treatments
  • Total solution for water treatments
  • Total solution for water treatments

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0056]10 different reagent grade salts: CuSO4, FeSO4, Ca(NO3)2. Fe(NO3)2, Al(NO3)3, NaNO3, Zn(NO3)2, K3PO4, Na3PO4 and NaCl, are individually dissolved in 1 liter deionized water to form 10 pure solutions with TDS ranging from 700 to 1000 ppm. Each solution is deionized on 5 serially connected units of cylindrical FTC, as shown in FIG. 1, individually sealed in a plastic housing with a capacity of 600 ml. During test, each solution flows through the FTC pack continuously at 1 l / min. Each FTC has a geometric area of 1400 cm2 for each electrode to form the FTC roll, and 3V DC is applied across the two electrodes of FTC for ion removal. Since the 5 units of FTC are charged in parallel, every FTC will receive 3V of charging voltage. The total charging current is about 6A. FIG. 4 shows the reduction of TDS for each salt after 3 cycles wherein every cycle contains 3 minutes of charging for deionization and 2 minutes of discharging and rinsing for regeneration. Except the salts containing ...

example 2

[0057]1.5 liters of 1% ammonia (NH3) water is prepared for ozonation using an ozone reactor as revealed in U.S. Pat. No. 6,984,295, which is currently owned by the assignee of the present invention. A pair of platinum coated titanium meshes, each is 10 cm wide by 10 cm long with opening of 3.5 mm×6.5 mm, is used to form the ozone reactor. The ozone reactor is placed in the container of 1.5 liters ammonia water under the application of 8.5V average voltage and 1.75 A average current and PWM control. Only the TDS of the ammonia water during ozonation is measured, and the hourly variation of TDS is shown in FIG. 5A. About 6 hours since the ozonation is began, the TDS of solution levels off indicating that the decomposition of ammonia by ozone has been completed. Most ammonia may be decomposed by ozone according to the following equation:

[0058]Next, the ozonated water is deionized using a single FTC unit as example 1, as well as 3V DC for deionization. TDS of the water is reduced smooth...

example 3

[0059]6 g of ammonia is dissolved in 2 liters tap water, which is mixed with 1 liter of filtered seawater (TDS=35,000 ppm). The salted ammonia water as prepared is first oxidized using an ozone reactor with electrode configuration of FIG. 2D concealed in a plastic housing as EXAMPLE 1. Iridium oxide (IrO2) is used as the ozone-forming material coated on titanium mesh, which has an opening of 1.5 mm×3.0 mm. A total of 32 pieces IrO2 / Ti disk electrodes of 5.3 cm diameter are disposed in the housing. The power for ozonation is set at 12V×10 A with the electrode polarities switched once every minute. The ammonia brine is circulated between the ozone reactor and a reservoir Table 1 lists the hourly variation of TDS, pH, voltage and current of ozonation

TABLE 1Ozonation of ammonia brine using an iridium oxide ozone reactorTime (hr)TDS (ppm)pHVoltage (V)Current (A)011,03010.43.810112,3009.903.910212,3009.703.910312,3009.203.910412,5007.904.010512,4008.174.010612,4008.184.010

[0060]If 2 liter...

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Abstract

All pollutants dissolved or existed in water can be grossly classified as ionized and neutral species. The former includes inorganic and organic ions, while the latter contains inorganic molecules, organic molecules and organisms. Using flow through capacitor for performing capacitive deionization (CDI), the ionic contaminants can be effectively and economically removed from water. Whereas the neutral contaminants are not retained in the static electric field of CDI, they can be decomposed upon flowing through an electrolytic ozonator. Either gaseous or ionic products will be generated at the ozone treatment, and the ionic byproducts can be subsequently removed by CDI. By integrating the electrolytic ozone reactor with flow through capacitor, the O3 / CDI hybrid technique becomes a total solution for eliminating hazardous materials in water. Both the reactor of in-situ ozone and the flow-through capacitor (FTC) of CDI are operated in energy conservative and pollution free conditions, so the detoxification of water is highly cost effective.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This invention relates to the elimination of ionic and neutral contaminants from water by using low power consumption without secondary pollution. More specifically, the invention relates to an integration of two techniques, low voltage ozone (O3) reactor and capacitive deionization (CDI) reactor, into a continuous flow-through system for reducing the conductivity and toxicity of various water.[0003]2. Background of the Related Art[0004]Water bound contaminants may stay as a free form, an emulsified form, dissolved but not dissociated, or dissolved and dissociated species in water. Charge is the main property to differentiate ionic pollutants from neutral ones. The objectives of all water treatments are the reduction of total dissolved solid (TDS), chemical oxygen demand (COD) and biological oxygen demand (BOD), as well as colony forming unit (CFU) of bacteria and viruses. TDS is a measure of ionic species, whereas the ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C25C7/00
CPCC02F1/463C02F1/4691C02F1/78C02F9/00C02F2201/4613C02F2201/782Y02W10/37
Inventor SHIUE, LIH-RENCHEN, MIN-CHUCHEN, MU-FA
Owner GAINIA INTELLECTUAL ASSET SERVICES
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