Sewage treatment process
1. Biological treatment process: Microorganisms are used to convert organic pollutants into harmless substances.
2. Physical treatment process: including filtration, precipitation, membrane separation, etc., used to remove suspended solids, colloids, heavy metals, etc.
3. Chemical treatment process: remove nitrogen, phosphorus and other nutrients and micro-pollutants through chemical reactions.
4. Adsorption treatment process: use activated carbon and other adsorbents to remove organic pollutants and heavy metals.
5. Electrolytic treatment process: use the principle of electrolysis to remove pollutants.
6. Oxidation treatment process: use oxidants to oxidize organic pollutants and heavy metals.
7. Jet aeration process: use nozzles to mix air and water to achieve the effect of aeration and mixing.
In the process of sewage treatment, these processes can be used separately according to the characteristics of sewage, and used together to meet the diverse purposes of sewage treatment in different occasions.
Sewage treatment process: 1. Separation technology of insoluble pollutants: 1. Gravity sedimentation: grit chamber (flat flow, vertical flow, swirling flow, aeration), sedimentation tank (flat flow, vertical flow, radial flow, oblique flow); 2. Coagulation and clarification; 3. Buoyancy flotation method: oil separation, air flotation; 4. Others: resistance interception, centrifugal separation method, magnetic separation method 2. Biochemical transformation technology of pollutants: 1. Activated sludge method: SBR , A/O, A/A/O, oxidation ditch, etc. 2. Biofilm method: biofilter, biological turntable, biological contact oxidation tank, etc. 3. Anaerobic biological treatment method: anaerobic digestion, hydrolysis acidification tank, UASB, etc. 4. Biological treatment method under natural conditions: stabilization pond, ecosystem pond, land treatment method 3. Chemical transformation technology of pollutants: 1. Neutralization method: acid-base neutralization 2. Chemical precipitation method: hydroxide precipitation, Ferrite precipitation, other chemical precipitation 3. Redox method: chemical oxidation method, chemical reduction method, electrochemical method 4. Chemical physical disinfection method: ozone, ultraviolet light, chlorine dioxide, chlorine gas, sodium hypochlorite 4. Dissolved pollutants Physical and chemical separation technology: 1. Adsorption method 2. Ion method 3. Membrane separation method: diffusion dialysis, electrodialysis, reverse osmosis, ultrafiltration, nanofiltration, microfiltration 4. Other separation methods: stripping and stripping, extraction, evaporation , crystallization, freezing.
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