Have you just entered the water treatment industry, or have friends who are engaged in water treatment around you, often can't understand what the "water people" are saying? "COD", "dissolved oxygen".What is it? Is the sludge still alive and dead?
Don't worry, today Daze will take you to open the door to the world of water treatment, the following 30 knowledge points, you can also quickly grasp the "industry black talk" of water treatment after reading!
1. Dissolved oxygen
Dissolved oxygen is the amount of oxygen dissolved in water (molecular oxygen).
2. Total phosphorus
The sum of phosphate and organophosphorus is called total phosphorus.
3. Activated sludge
Activated sludge is usually yellow-brown flocculent with flocculating particles.
4. Activated sludge system
The activated sludge system consists of an aeration tank, a sedimentation tank, a sludge return and a residual sludge removal system. (Reference: Activated Sludge Process Control).
5. Activated sludge process
Activated sludge processes include A-B process, SBR process, A2 O process, oxidation ditch process, etc.
6. Sludge reflux ratio
The sludge return ratio refers to the ratio of the return sludge flow rate to the influent flow rate.
7. Factors affecting the effect of activated sludge treatment
The factors affecting the effect of activated sludge treatment include: sludge load, sludge age, dissolved oxygen, nutrients, pH value, water temperature, toxic substances, sludge reflux ratio, etc.
8. Hydraulic retention time
Hydraulic retention time refers to the residence time of water in the treatment system and is measured in d (days).
9. Chemical oxygen demand (COD).
Chemical oxygen demand (COD) refers to the amount of oxidant consumed by the interaction of organic matter and strong oxidant in water under certain conditions.
10. an anaerobic pool
The technical term for anaerobic pond is anaerobic hydrolysis acidification tank.
11. The proportion relationship between the three major nutrients (carbon source, nitrogen source and phosphorus source).
Generally, the ratio of the three major nutrients (carbon source, nitrogen source and phosphorus source) is BOD:N:P=100:5:1.
12. Factors affecting the physiological activities of microorganisms
There are many factors that can affect the physiological activities of microorganisms, including nutrients, temperature, dissolved oxygen and toxic substances.
13. an anoxic pool
There are facultative aerobic bacteria and denitrifying bacteria in the anoxic tank.
14. Biochemical inlet index
Biochemical inlet water index COD: < 3000 mg L, NH3-N< 300 mg L, Ron < 700 mg L, S< 70 mg L, CN-< 20 mg L, oil: < 50 mg L, pH: 7-9.
15. Factors affecting nitrification reaction
The factors influencing the nitrification reaction are do, t, ph, alkalinity, sludge age, and reflux ratio.
16. The role of the secondary sedimentation tank
The role of the secondary sedimentation tank is the separation of mud and water.
17. Factors affecting the coagulation effect
The factors that affect the coagulation effect are water temperature, pH value, and alkalinity.
18. Three forms of precipitation
There are three forms of sedimentation: natural sedimentation precipitation, coagulation precipitation, and chemical precipitation.
19. The method of pretreatment
The methods of pretreatment mainly include pre-sedimentation, coagulation, clarification, filtration, softening, disinfection, etc.
20. Colloidal particles in water
Colloidal particles in water are 10-4 10-6mm in size, which are stable in water and do not settle easily.
21. Composition of colloidal particles in water
Colloidal particles in water are composed of three parts: colloidal core, adsorption layer and diffusion layer.
22. a coagulant
In water treatment, this substance, which is able to make colloidal particles in water bond and coalesce with each other, is called a coagulant.
23. Biological coagulant
Biocoagulant is a new type of coagulant developed in recent years, which is composed of highly decomposed substances and biological resins produced by microorganisms.
24. The full name of the A2 O process
The full name of the A2 O process: dual biofilm pre-denitrification biological phosphorus and nitrogen removal process.
25. The role of aeration
In activated sludge systems, the role of aeration is to supply dissolved oxygen to the liquid phase and to stir and mix.
26. pH value
The pH of water is a negative logarithmic value that indicates the concentration of hydrogen ions in the water.
27、mg/l
Mg L is a unit that indicates the amount of a substance or impurity in water.
28. Suspended solids
Suspended matter in water is particles with a particle value of about 10-4 mm or more.
29. Nitrification
Nitrification is the process of converting ammonia nitrogen into nitrate nitrogen.
30. Denitrification reaction
The denitrification reaction is the process of reducing nitrate or nitrite produced during the nitrification process to N2.
That's all for the water treatment industry in this issue, there are a lot of knowledge points about water treatment, and if there is anything you don't understand, welcome to leave a message or private message, and answer for you in the next issue!