Method for electrochemical degradation of organic pollutants outside electrolyzer and application

Abstract

The invention discloses a method for electrochemical degradation of organic pollutants outside an electrolyzer and an application. Water electrolysis is carried out in a diaphragm electrolyzer to prepare high-oxidation-activity water, and then the high-oxidation-activity water is rapidly guided out and sprayed to the surface of a to-be-cleaned object so as to degrade organic pollutants on the surface of the object. The method can be applied to cleaning of the object with the organic pollutants adhered to the surface. The method has the advantages that the high-oxidation-activity water is guided out in time and then reacts with the organic pollutants, so that the organic pollutants are not in contact with an electrode, electrode inactivation caused by organic matter adhesion is avoided, the effect of degrading the pollutants rich in polycyclic aromatic hydrocarbon is obvious, and the method is particularly suitable for cleaning the surface of a large workpiece which cannot be soaked in the electrolyzer; and the cleaning process is thorough, no detergent is used, a large amount of water is not used for washing, water resources are saved, organic dirt is reduced through degradation, disinfected and sterilized residual inorganic component dirt is treated in a centralized manner, total emission is reduced, and environmental pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of organic pollutant degradation, in particular to a method and application for electrochemically degrading organic pollutants outside a tank. Background technique [0002] The dirt on the surface of the object is composed of organic and inorganic components. The organic matter acts as an "adhesive" to adhere the inorganic particles to the surface of the object to form dirt together. The traditional dirt cleaning is to use detergent and other surfactants to remove the adhesion of dirt and organic matter, and then use the physical scouring force of a large amount of water to wash down the mixed dirt. The total discharge is dirt + detergent + water. However, this traditional cleaning method consumes a lot of water and discharges (for example, when washing a car, each car consumes about 100-150L of water, because it contains a lot of detergent, the COD value of the wastewater produced is very high), according t...

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Problems solved by technology

The electrolytic method is cited mainly in the field of car cleaning, and there are few reports on the architectural glass curtain wall. For example, the patent CN212127830U discloses a movable car washing device. The U-shaped tank recycles waste water and recycles waste water through electrolysis. This scheme has the following problems: 1. The device is large and requires vehicle loading equipment to carry out mobile services, which is limited by cost and site conditions; 2. Splashing is inevitable in the washing method. It cannot be guaranteed that all the water will be collected in the U-shaped tank, which may cause a small amount of pollution to the parking lot; 3. A complete set of mud pump system is required for the recovery of wastewater in the U-shaped tank, and the follow-up processing tasks are heavy.

CN108263345A discloses a pressurized car washing device, which uses the gas generated by electrolysis to achieve pressurization and replaces the booster pump system. In fact, this solution finally produces hydrogen and oxygen after electrolysis, and cannot generate ozone for organic degradation because it uses graphite. Oxygen-modified titanium electrode sheet is used as the anode, which has a low oxidation-reduction potential and mainly generates oxygen, and does not produce highly oxidatively active substances. It will also quickly recombine with the cathode product to regenerate water. This process is an exothermic reaction and is prone to danger. Therefore, the system can only be pressurized, and the electrolysis product cannot replace detergent. In order to achieve a better cleaning effect, it is necessary to use a detergent. chemicals and flushing with large volumes of water, and it does not solve the problem of wastewater discharge

CN204037517U discloses a kind of automatic car washing machine, and CN110576833A discloses a kind of automatic car washing machine and its system, both are to utilize the alkaline water that electrolysis produces to replace detergent, also need wash with a large amount of water at last; The pollutants undergo hydrolysis reaction, which is effective for straight-chain hydrocarbons, but automobile exhaust pollutants are rich in polycyclic aromatic hydrocarbons (such as benzopyrene, etc.), which are usually difficult to undergo hydrolysis reaction, and are difficult to degrade and remove by hydrolysis This type of pollutants is degraded by using alkaline water. The process is relatively mature. The electrolysis efficiency of pure water is very low, and salt substances need to be added. The conventional process is to add sodium chloride, but it will generate toxic and harmful chlorine gas, which is harmful; in addition , although the car washing machine saves the cleaning agent storage and pumping system, it offsets the advantages with the added alkaline water electrolysis system, and the cost is even higher, and the problem of wastewater discharge is not solved at the same time

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