Basic Knowledge of Wastewater Treatment

1. What is water self-purification?

Self-purification of water body: The polluted river undergoes physical, chemical, biological and other aspects to reduce or transform the concentration of pollutants, and the water body is restored to its original state, or the original water quality standard is reduced to equal to the water quality standard.

2. What are the basic methods of wastewater treatment?

The basic method of sewage treatment is to use various methods and technologies to separate and remove the pollutants in the sewage, recycle them, or convert them into harmless substances, so that the sewage can be purified. Generally divided into water supply treatment and sewage treatment.

3. What are the current wastewater treatment technologies?

Modern sewage treatment technology can be divided into physical treatment method, chemical treatment method, and biological treatment method according to the principle of action.

4. Under what circumstances should the biochemical method be used?

It is generally believed that only sewage with a BOD/COD value greater than 0.3 is suitable for biochemical treatment. 6. What is the sanitary standard of drinking water?

Physical indicators of drinking water sanitation standards: color, turbidity, odor and taste.

5. What is eutrophication of water bodies?

Eutrophication of water bodies is a natural phenomenon that occurs in fresh water and causes the sudden and excessive proliferation of algae due to the high content of nitrogen, phosphorus, and potassium in the water body.

The eutrophication of the water body is mainly due to the discharge of nitrogen, phosphorus, potassium and other elements into the surface water body with slow flow rate and long renewal cycle, which makes aquatic organisms such as algae grow and reproduce in large quantities, so that the rate of organic matter production far exceeds the rate of consumption. The process of accumulating organic matter and destroying the balance of aquatic ecology.

6. What is dissolved oxygen?

The oxygen dissolved in water is called dissolved oxygen. The living organisms and aerobic microorganisms in water bodies rely on dissolved oxygen as the oxygen they depend on for survival. Different microorganisms have different requirements for dissolved oxygen.

7. What is the basic method of modern sewage treatment?

Modern sewage treatment technology can be divided into physical treatment method, chemical treatment method, and biological treatment method according to the principle of action.

8. What is the stability of colloids?

Stability of colloid: refers to the characteristic of colloidal particles to maintain a long-term dispersed and suspended state in water.

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