Nano-titanium photoelectrocatalytic water treatment device and method

Abstract

The invention provides a nano titanium photoelectric catalysis water treatment device and method. The water treatment device comprises a pond, the pond is provided with a water inlet pipe and a water outlet pipe of to-be-treated water, the pond is internally provided with a titanium polar plate and an electrode plate, a nano titanium dioxide film is loaded on the titanium polar plate, a partition film is arranged between the titanium polar plate and the electrode plate, the to-be-treated water flows between the diaphragm and the electrode plate, external circulating water flows between the partition film and the titanium polar plate, the titanium polar plate and the electrode plate are connected with an external power source, and accordingly an electric field is formed between the titanium polar plate and the electrode plate. The innovative nano titanium photoelectric catalysis water treatment device can effectively improve catalysis efficiency, cannot cause secondary pollution, caused by nitrate, of water, and has the outstanding advantages of being low in energy consumption, easy to operate and capable of degrading various pollutants during water treatment. Experiments show that the device and method have a good pollutant removal effect.

Description

technical field [0001] The invention relates to a water treatment device and method, in particular to a nano-titanium photoelectric catalysis water treatment device and method. Background technique [0002] Drinking water sources are affected by industrial wastewater, domestic sewage, and a large amount of pesticide and fertilizer residues produced by agriculture, which seriously affects the quality of drinking water. In recent years, semiconductor photocatalytic oxidation technology has been developed rapidly as a wastewater treatment technology. Photocatalysis is a catalytic reaction caused by the irradiation of light with a wavelength of 300-400nm. Through the photocatalytic reaction, hydroxyl radicals with strong oxidizing ability are generated to decompose organic pollutants into water and carbon dioxide. [0003] However, the inventor has been engaged in the work of titanium dioxide photocatalysis for a long time, and found that titanium dioxide powder and its nano-po...

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Problems solved by technology

[0004] 1. The catalytic efficiency of simply using light is low

[0005] Chinese patent CN203247119U discloses a titanium dioxide film water treatment device, including a plexiglass cylinder, an optical fiber device and a titanium dioxide film carrier are arranged in the plexiglass cylinder, and the optical fiber device is connected to a light concentrating device through an optical fiber connection device , the patent hopes to improve the efficiency of photocatalysis through the concentrating device and the optical fiber device, but the degree of improvement is still limited

[0006] 2. During the catalytic process, titanium dioxide powder will enter the treated water, causing secondary pollution to the treated water

[0007] Recent reports have also confirmed this situation. The research group of Professor Yu Hanqing, School of Chemistry and Materials Science, University of Science and Technology of China, found through research that nano-titanium dioxide powder can be converted into nitrate, which may lead to potential environmental pollution problems.

Nano-titanium dioxide powder is widely used in many fields around the world due to its high refractive index, super strong ultraviolet light absorption capacity, good sterilization, deodorization and antifouling properties. However, it has been proved by experiments that the abundant nitrogen in the atmosphere And oxygen can form nitrate through photocatalytic reaction on the surface of nano-titanium dioxide, and combine theoretical calculation and analysis to clarify the formation mechanism of nitrate. Excessive discharge of nitrate into water will cause poisoning to the human body, such as causing children's "blue baby" Syndrome", can also cause eutrophication of water body and the outbreak of blue-green algae, resulting in environmental pollution problems

[0008] The photocatalytic formation of nitrate by titanium dioxide powder reminds people that the potential environmental risks of using a large amount of nano titanium dioxide may be underestimated, which may exacerbate the increasingly serious nitrogen pollution problem

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