Apparatus for generating sodium hypochlorite

Abstract

The present invention provides an apparatus for generating sodium hypochlorite, comprising: a pretreatment means for pretreating inflowing feed water to produce pure water; a salt storage tank for producing a saturated sodium chloride aqueous solution with the inflowing pretreated pure water and accommodating sodium chloride; a diaphragm electrolytic bath comprising an anode chamber to which the saturated sodium chloride aqueous solution flows, a cathode chamber in which the pretreated pure water flows, and an ion exchange membrane for dividing the anode chamber and the cathode chamber; an anode water storage tank for storing a chlorine gas and anode water generated by electrolysis of the anode chamber; a cathode water chamber for storing sodium hydroxide generated by electrolysis of the cathode chamber and dilution of a hydrogen gas below an explosion limit to discharge the same; a sodium hypochlorite reaction chamber for generating sodium hypochlorite through the reaction of the chlorine gas supplied from the anode water storage tank and the sodium hydroxide generated at the cathode water storage tank; and a sodium hypochlorite storage tank for storing the sodium hypochlorite generated at the sodium hypochlorite reaction tank. The present invention can reduce disinfection by-products, lower maintenance costs and provide ease of use. Particularly, it is possible to prevent the danger of chlorine leakage due to chlorination, and a disinfectant is directly generated with sodium chloride on site without a chlorine transporting process, thereby remarkably reducing danger.

Description

technical field [0001] The invention relates to an engineering technique of chlorine disinfection for replacing the sterilization and disinfection of the upper and lower sewers. It is a device that uses a diaphragm-type electrolytic cell to electrolyze sodium chloride aqueous solution, and reacts chlorine (Cl2) generated on the anode with sodium hydroxide (NaOH) generated on the cathode to generate sodium hypochlorite. Background technique [0002] In water treatment engineering, most of the sterilization and disinfection technologies rely on salt-based disinfectants. In particular, more than 90% of the sterilization and disinfection in the water treatment project use chlorine, sodium hypochlorite, calcium hypochlorite, etc. for disinfection of the saline system. Here, chlorine is mainly used in large and medium-sized water purification plants, sodium hypochlorite is mainly used in small water purification plants, and sodium hypochlorite or calcium hypochlorite is mainly us...

AI Technical Summary

Problems solved by technology

[0003] In the case of chlorine injection equipment used in large and medium-sized water purification plants, there is always a danger of leakage of toxic substance-chlorine inherently, and there is a need for safety management experts based on chlorine use and an increase in maintenance management costs, and safety managers are exposed to danger. Subordinate issues

In addition, including the reaction with water when chlorine is injected, there is a problem that chlorate may be formed as a by-product

[0004] Although an on-site sodium hypochlorite generating device based on the electrolysis of aqueous sodium chloride solution has been described, the existing sodium hypochlorite generating device supplies DC power to an electrolytic cell with a low-concentration sodium chloride solution of about 3% to generate approximately When the 8,000ppm sodium hypochlorite device is applied to large and medium-sized water purification plants, there are practical problems such as excessive equipment scale, excessive cost and maintenance management costs, low economic efficiency, and insufficient countermeasures for chlorate by-products.

[0005] In addition, the registered patent No. 10-0523982 'Electrochemical bactericide generator' is a device for generating electrochemical bactericides, although the anode chamber which obtains the supply of saturated sodium chloride aqueous solution to generate chlorine and the supply of water and a cathode chamber for generating sodium hydroxide, an electrolytic cell with a cationic ion exchange membrane separating the anode chamber and the cathode chamber, and chlorine supplied from the anode chamber and hydrogen supplied from the cathode chamber Sodium oxide reacts to generate hypochlorite, etc., but in the case of such electrolysis equipment, no measures to reduce by-products such as chlorate have been clearly stated.

Images