Have you mastered it? 10 essential basic knowledge points of wastewater treatment-Hezhong Environment (Beijing) Co., Ltd. was established in 2003

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Have you mastered it? 10 essential basic knowledge points of wastewater treatment

Published Time:

2021-12-14

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1. What is water self-purification?

Water self-purification: The process by which pollutants in a river are reduced or transformed through physical, chemical, and biological processes, restoring the water body to its original state or reducing it from exceeding water quality standards to meeting them.

2. What are the basic methods of wastewater treatment?

Basic methods of wastewater treatment: Employing various methods and technologies to separate and remove pollutants from wastewater, recycle them, or convert them into harmless substances, thus purifying the wastewater. This is generally divided into water supply treatment and wastewater treatment.

3. What wastewater treatment technologies are currently available?

Modern wastewater treatment technologies can be divided into physical, chemical, and biological treatment methods according to their working principles.

4. Five water measurement indicators

Biochemical Oxygen Demand (BOD): The amount of oxygen required to degrade organic matter through microbial action under aerobic conditions. It is a comprehensive indicator of organic pollution in wastewater.

Theoretical Oxygen Demand (ThOD): The theoretical oxygen demand of a specific organic substance in water. This usually refers to the theoretical value of the oxygen required to completely oxidize the carbon and hydrogen elements in the organic matter into carbon dioxide and water (i.e., the oxygen demand calculated according to the complete oxidation reaction formula).

Total Oxygen Demand (TOD): The amount of oxidizable substances in water, mainly the oxygen required for organic substances to become stable oxides during combustion, expressed as mg/L of O2.

Chemical Oxygen Demand (COD): The amount of reducible substances in a water sample that need to be oxidized using chemical methods. In wastewater, wastewater treatment plant effluent, and polluted water, it represents the oxygen equivalent of substances (generally organic matter) that can be oxidized by strong oxidants.

Total Organic Carbon (TOC): The total amount of carbon in dissolved and suspended organic matter in a water body.

5. Under what circumstances is biochemical treatment used?

It is generally considered that only wastewater with a BOD/COD value greater than 0.3 is suitable for biochemical treatment.

6. What are the hygiene standards for potable water?

Physical indicators of potable water hygiene standards: color, turbidity, odor, and taste.

7. What is eutrophication of water bodies?

Eutrophication of water bodies is a natural phenomenon that occurs in freshwater, caused by excessive nitrogen, phosphorus, and potassium levels leading to sudden overgrowth of algae.

The main cause of water eutrophication is the discharge of nitrogen, phosphorus, potassium, and other elements into slow-flowing surface waters with long renewal cycles, causing excessive growth of algae and other aquatic organisms. This leads to organic matter production far exceeding consumption, resulting in organic matter accumulation in the water body and disrupting the aquatic ecological balance.

8. What is dissolved oxygen?

Oxygen dissolved in water is called dissolved oxygen. Aquatic organisms and aerobic microorganisms rely on dissolved oxygen for survival. Different microorganisms have different dissolved oxygen requirements.

9. What are the basic methods of modern wastewater treatment?

Modern wastewater treatment technologies can be divided into physical, chemical, and biological treatment methods according to their working principles.

10. What is the stability of colloids?

Colloid stability: The characteristic of colloid particles remaining dispersed and suspended in water for a long time.