News Column

Patent Issued for Liquid Treatment Module

January 29, 2014

By a News Reporter-Staff News Editor at Journal of Engineering -- Changzhou Est Purification Equipment Co. Ltd. (CN) has been issued patent number 8628654, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventors are Sun, Xiaowei (Changzhou, CN); Sun, Xiaoming (Changzhou, CN); Shao, Huanqing (Changzhou, CN); Zhan, Borong (Changzhou, CN).

This patent was filed on November 30, 2007 and was published online on January 14, 2014.

From the background information supplied by the inventors, news correspondents obtained the following quote: "There are many methods for liquid treatments to remove impurities, especially for water treatment. Typical treatment methods include distillation, reverse osmosis, electrodialysis, ion exchange, and freezing. Among them, the major methods utilized for large industrial scale applications include:

"(1) Ion exchange: It uses ion exchange resins to treat liquid. The price of ion exchange resins is very high, and the process needs strong acids and alkali for resin regeneration, which produces secondary pollution. Moreover, the maintenance of the equipment is complicated.

"(2) Reverse osmosis: This is the most commonly used industrial water purification method. It has advantages such as high desalination rate, simple process, etc. However, the macromolecule membranes are easily polluted and fouled by the organic substances, calcium and chlorine in water. It requires very restrictive pre-treatment system and the addition of several types of antioxidant and anti-scale inhibitor. These increase the complexity of the treatment system, and may cause troubles in system operation and maintenance.

"(3) Electrodialysis: It is composed of the electrode plates, separation membrane, and ion exchange resins. Under the attraction forces of a DC electrical field, ions move through the membranes and are adsorbed on the ion exchange resins. However, the incorporated membranes are easily fouled, like in the reverse osmosis. Also, such treatment can only get rid of ions, and it has no effects on organic substances, colloid particles or other particles, or suspended solids. Moreover, the equipment consumes lots of energy due to the water electrolysis on the electrode plates.

"A published patent CN2463054Y titled 'Module for liquid treatment and purification' claims that the module has a function of self-regeneration and it addresses the problems of high energy consumption, and membrane fouling as well as the high system pressure. The module includes at least a pair of parallel power distribution panels, insulation baffles, electrode plates, power distribution components, and liquid inlet and outlet holes on the side plates. When a DC power is supplied on the positive and negative plates through the power distribution components and the power distribution plates, with the liquid to be processed passing through the positive and negative electrode plates, the impurity ions and charged particles in the liquids migrate to the positive and negative electrodes, and they are stored in the electric double layer on the electrode surface. Thus, the impurity ions and electrically charged particles and molecules in the liquid are removed from the processed liquid. When the positive and negative electrodes are shorted, the ions and charged particles stored in the electric double layer return to the liquid channel due to the disappearance of direct current electric field and the formation of the internal loop. The ions, molecules and particles are discharged with the washing liquid. The adsorbed organic matters on the electrodes can be decomposed when the electric field was applied. All the impurities are discharged from the electrodes at the regeneration stage and the electrodes can be re-utilized afterwards.

"The structure of the liquid treatment modules described in CN2463054Y has the following shortcomings:

"1) It can only handle a small amount of liquid. Because there are lots of power distribution panels, there are only limited space left to accommodate the electrode plates for liquid treatment. Hence the total handling capacity is limited;

"2) The module structure is complex. Because the system requires multiple power distribution plates, each of which requires its own component, the reliability is reduced; and

"3) Operating current is very large. The power distribution plates are connected to the DC power supply through their own distribution components. The large working current requires large power supply system, and thus, the manufacturing costs of the treatment devices increase."

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventors' summary information for this patent: "The present invention provides the means to make a liquid treatment module that has a simple structure, can handle a large amount of fluid and has highly improved efficiency.

"The technical strategy of the present invention is realized by the following in a liquid treatment module, including power distribution panels, electrode panels, and a framework with side plates. The liquid treatment module is characterized by the two power distribution panels are fixed on the side plates by connecting pieces. The electrode plates of the power distribution panels are placed on the inside the distribution panels. The power distribution panels are connected to the DC power supply through the electrical wires. Two or more double-sided electrode plates are stacked between the two power distribution panels. There are separators between the adjacent double-sided electrode plates to provide channels for liquid flow, and the flow channels are connected to the inlet and outlet holes on both side panels. The power distribution panels, double-sided electrode plates, and the separator are bonded, supported, sealed and insulated by the package.

"This invention has the following advantages:

"1) It can deal with a large quantity of liquid. The present invention only needs two power distribution panels, and a number of double-sided electrode plates are stacked between the two distribution panels. Lots of electrode plates could be placed for liquid treatment, so that the liquid handling capability is greatly improved.

"2) Simple structure. The present invention only needs two distribution panels for imposing current. The power distribution panels are connected to the power supply through the electric wires. Because the power is supplied in series, such arrangement can greatly reduce the operating current, simplify the power supply system, and improve the reliability of fluid treatment modules.

"3) Reliable connection. The present invention uses the package to bond, support, seal and insulate power distribution panels, double-sided electrode plates and the separators. The packaging not only conveniently provides the good insulation between the distribution plate and the double-sided electrode plates, but also fixes separators and the double-sided electrode plates at locations and improves the mechanical strength of the module.

"4) High treatment efficiency. The invention has separators between the adjacent electrode plates to separate the two plates. The liquid flow streams are static mixed through the turbulence resulted from the separator with specific design. This arrangement can speed up the liquid flow in the liquid channel and improves the opportunity for contaminating ions and charged particles in liquid to migrate closer to electrodes which can accelerate their movements toward the positive and negative electrodes under the applied electric field. The impurities of ions, charged particles and organic matters in liquid are stored in the electrode double-layer of the electrodes and are hence removed from the flowing liquid. The handling capacity of the module is then improved."

For the URL and additional information on this patent, see: Sun, Xiaowei; Sun, Xiaoming; Shao, Huanqing; Zhan, Borong. Liquid Treatment Module. U.S. Patent Number 8628654, filed November 30, 2007, and published online on January 14, 2014. Patent URL:

Keywords for this news article include: Treatment, Changzhou Est Purification Equipment Co. Ltd..

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Source: Journal of Engineering

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