Collection! Sewage treatment must master the basic knowledge encyclopedia!

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1. What is water self-purification?

Water self-purification: the polluted river through physical, chemical, biological and other aspects of the role, so that the concentration of pollutants reduced or transformed, the water body to restore to the original state, or from the initial water quality standards reduced to equal to the water quality standards.

2. What are the basic methods of sewage treatment?

The basic method of sewage treatment is to use various means and technologies to separate and remove the pollutants in the sewage, recycle them, or convert them into harmless substances to purify the sewage. Generally divided into water treatment and sewage treatment.

3. What are the current sewage 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, five water measurement indicators

Biochemical oxygen demand (BOD): refers to the oxygen required to degrade organic matter under aerobic conditions due to the action of microorganisms. It is a comprehensive indicator that sewage is polluted by organic matter.

Theoretical oxygen demand (thOD): The theoretical oxygen demand of an organic substance in water. It usually refers to the theoretical value of oxygen required to completely oxidize carbon and hydrogen in organic matter into carbon dioxide and water (that is, the oxygen demand calculated according to the complete oxidation reaction formula.

Total oxygen demand (TOD): refers to the amount of oxygen required for substances that can be oxidized in water, mainly organic substances to become stable oxides during combustion. The result is expressed in mg/L of O2.

Chemical oxygen demand (COD): is a chemical method to measure the amount of reducing substances in water samples that need to be oxidized. The oxygen equivalent of substances (usually organic matter) that can be oxidized by strong oxidants in wastewater, effluent from wastewater treatment plants and contaminated water.

Total organic carbon (TOC): refers to the total amount of dissolved and suspended organic matter containing carbon in water.

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