water treatment technology
1. What is the self-purification of water bodies?
Self-purification of water bodies: Contaminated rivers undergo physical, chemical, biological, etc. effects, so that the concentration of pollutants is reduced or converted, and the water bodies are restored to their original state, or reduced from the initial exceedance of water quality standards to equal water quality standards.
2. What are the basic methods of wastewater treatment?
The basic method of sewage treatment is to use various means and techniques to separate and remove the pollutants from the sewage, recycle them, or convert them into harmless substances so that the sewage can be purified. Generally divided into water treatment and sewage treatment.
3. What are the current sewage treatment technologies?
Modern sewage treatment technology, according to the principle of action can be divided into physical treatment, chemical treatment, biological treatment.
4. Five water indicators
Biochemical oxygen demand (BOD): The amount of oxygen required to degrade organic matter due to the action of microorganisms under aerobic conditions. 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. Usually refers to the theoretical value of oxygen required to completely oxidize the carbon and hydrogen elements in organic matter into carbon dioxide and water (ie, the oxygen demand calculated from the complete oxidation reaction formula.
Total oxygen demand (TOD): refers to the substance that can be oxidized in water, and is mainly the oxygen amount required when organic substances become stable oxides during combustion. The result is expressed as mg/L of O2.
Chemical oxygen demand (COD): Chemically measures the amount of reducing material that needs to be oxidized in a water sample. Wastewater, effluent from wastewater treatment plants and contaminated water, oxygen equivalents of substances (usually organic) that can be oxidized by strong oxidants.
Total Organic Carbon (TOC): Refers to the total amount of dissolved and suspended organic matter in the water.
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