Method and principle of sewage treatment

Uv water treatment technology - reducing total organic carbon

In many high-tech and laboratory installations, organic matter can hinder the production of high purity water. There are many ways to remove organic matter from water, the more common methods include the use of activated carbon and reverse osmosis. Shorter wavelengths of ultraviolet light (185 nm) can also effectively reduce total organic carbon. Shorter wavelengths of ultraviolet light have more energy and are therefore able to break down organic matter. Although the reaction process of ultraviolet oxidation of organic is very complex, the main principle of ultraviolet water treatment technology is to oxidize organic matter into water and carbon dioxide by producing free hydrogen and oxygen with strong oxidation capacity. Like ozone removal systems, this organic carbon-degrading UV system emits three to four times as much UV radiation as conventional disinfection systems.

Ultraviolet water treatment technology - Degradation of residual chlorine in municipal water treatment and water supply systems, chlorination disinfection is very necessary. However, in the industrial production process, in order to avoid adverse effects on the product, the removal of residual chlorine in the water is often necessary for pre-treatment. The method of eliminating residual chlorine is based on activated carbon bed and chemical treatment. The disadvantage of activated carbon water treatment is that it requires continuous regeneration and often encounters the problem of bacterial growth. Both 185nm and 254nm wavelengths of ultraviolet light have been shown to effectively break the chemical bonds of residual chlorine and chloramines. Although it requires huge ultraviolet energy to play a role, the advantage of ultraviolet water treatment technology is that this method does not need to add any drugs to the water, does not need to store chemicals, is easy to maintain, and at the same time has the role of sterilization and removal of organic matter.

Features:

1, pulsed ultraviolet sterilization method, wide spectrum energy, eliminate the phenomenon of microbial light resurrection

2, the use of stainless steel shell, long service life

3, the lamp can be manually cleaned or automatic mechanical cleaning

4, automatic control system, intelligent operation

Acoustic processing

Ultraviolet light with wavelengths from 200 to 300nm has bactericidal effects. UVC radiation has a strong bactericidal power. It is absorbed by DNA and destroys its structure, thereby removing the activity of living cells. Microorganisms such as viruses, bacteria, yeasts, and fungi are rendered harmless within seconds by UV lamps. As long as the radiation intensity is high enough, UV sterilization is a reliable and environmentally friendly method, as no chemical additives are required. In addition, microbes cannot produce antibodies to ultraviolet light.

For UV sterilization, a low-pressure mercury lamp with a single chromatographic emission wavelength of 254 nm can be used, or a medium-pressure mercury lamp with a broadband spectrum covering the entire range from 200 to 300 nm can be used, or an excimer lamp with only a wavelength of 222 nm can be used.

The advantages of century source UV lamp for water treatment:

It has no effect on taste or smell;

No need to add chemicals;

No environmental pollution;

Short radiation time;

Effective against chlorine-resistant pathogens;

Easy to operate;

The maintenance requirement of the process is small;

Extremely low operating costs.

Biochemical process

Biochemical water treatment method uses various bacteria and microorganisms existing in nature to decompose organic matter in wastewater into harmless substances, so that wastewater can be purified. Biochemical water treatment methods can be divided into activated sludge method, biological membrane method, biological oxidation tower, land treatment system, anaerobic biological water treatment method.

Biochemical water treatment process:

Raw water → grid → regulating tank → contact oxidation tank → precipitation site → filtration → disinfection → effluent.

1, activated sludge water treatment method

(1) Pure oxygen aeration method. The first pure oxygen aerated sewage treatment plant was built in the United States in 1968. Due to the decreasing cost of producing oxygen, pure oxygen aeration method is widely used.

(2) Deep-water aeration method. Increasing the depth of the aeration pool can increase the pressure of the pool water, thus improving the solubility of oxygen in the water, and the dissolution rate of oxygen should also be increased. Therefore, the dissolved oxygen in the deep-water aeration pool is higher than that in the ordinary aeration pool, and the depth of the pool is generally increased from the original 4 m to about 10 m.

(3) Jet aeration method. The mixed liquid composed of sewage and sludge passes through the jet machine, and the negative pressure is generated due to the high-speed jet, so that a large amount of air is inhaled, and the air is fully in contact with the mixed liquid, which improves the oxygen absorption rate of the sewage, so that the sewage treatment efficiency is improved.