Capacitance type sewage and waste water treatment device and method based on action of direct current electric field

Abstract

The invention discloses a capacitance type sewage and waste water treatment device and method based on the action of a direct current electric field. After saliferous sewage or waste water is pretreated through sand leach, ultrafiltration and the like, the saliferous sewage or waste water sequentially enters two levels of capacitance deionization modules to finish 95% desalination, fresh water is obtained, and back wash concentrated water can return to the first-level capacitance deionization module through a backflow pipeline to be retreated. The capacitance type sewage and waste water treatment device and method have the advantages that ion grids in the capacitance deionization modules can effectively prevent anions and cations from being adsorbed by an electrode in the reverse charge desorption process, and the cleaning effect, the regenerating effect and the working efficiency of the electrode are improved; the capacitance deionization modules are utilized for treating sewage, the operation is relieved, a PVC plastic material can be used for replacing expensive double-phase stainless steel, the problem of corrosion to a metal pipeline from salt in the sewage is thoroughly solved, and the water utilization rate is obviously higher than the water utilization rate of a reverse osmosis membrane method. In addition, the large investment on a reverse osmosis membrane method concentrated water energy recycling device can be saved through the reduction of the system running pressure.

Description

technical field [0001] The invention relates to a sewage and waste water treatment equipment and method, in particular to a capacitive water and waste water treatment equipment and treatment method based on the action of a DC electric field. Background technique [0002] With the development of the economy and the expansion of the population, the water resources required by industry and life are increasingly scarce, and the purification of water resources has become a worldwide concern. There are many ways to solve the shortage of water resources. Among them, the reuse of sewage (waste) water and the development of reclaimed water resources, that is, increasing the reuse rate of water, is an effective way to solve the shortage of water resources in many countries. At the same time, the country's new "Environmental Protection Law" has also been implemented on January 1, 2015. The requirements for the discharge of industrial sewage (waste) water are becoming increasingly strin...

AI Technical Summary

Problems solved by technology

[0006] The capacitive deionization module has the following problems in the above reverse charge desorption process: when the capacitive deionization module is in reverse charge desorption (that is, the electrode applies a reverse voltage), the cations adsorbed on the negative electrode, and the cations adsorbed on the The anions on the positive electrode detach and return to the solution through the corresponding porous carbon film. Since the distance between the positive and negative electrodes is very small, some desorbed cations and anions are adsorbed by the opposite electrode (opposite polarity), which is It affects the cleaning and regeneration effect of the positive and negative electrodes of the capacitive deionization module, and reduces the work efficiency

In addition, the distance between the electrodes of the existing technology is more than 10mm, which makes the path of directional migration of ions to the oppositely charged electrode surface longer, and also reduces the work efficiency.

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