Common classification of sewage treatment process What? According to "Water Pollution Control Project" classification of insoluble pollutants separation technology: 1, gravity settlement: grit chamber (advection, vertical flow, cyclone, aeration), sedimentation tanks ); 2, coagulation clarification; 3, buoyancy floating on the law: grease, flotation; 4 others: resistance retention, centrifugal force separation method, magnetic separation of pollutants biochemical conversion technology: 1, activated sludge method: SBR , AO, AAO, oxidation ditch 2, biofilm: biofilter, biological turntable, biological contact oxidation pond 3, anaerobic biological treatment: anaerobic digestion, hydrolysis acidification pool, UASB 4, under natural conditions Biological treatment: Stabilization ponds, ecosystem ponds, land treatment method of chemical pollutants conversion technology: 1, neutralization: acid and alkali 2, chemical precipitation: hydroxide precipitation, ferrite precipitation, other chemical precipitation 3, the redox method: chemical oxidation, chemical reduction method, electrochemical 4, chemical and physical disinfection: ozone, ultraviolet light, chlorine dioxide, chlorine, sodium hypochlorite dissolved pollutants physical and chemical separation techniques 1, adsorption method 2, ion exchange method 3, membrane separation method: diffusion dialysis, electrodialysis, reverse osmosis, ultrafiltration, nanofiltration, microfiltration 4 other separation methods: stripping and stripping, extraction, evaporation, crystallization, freezing Classification according to common wastewater treatment methods: physical or mechanical separation process. Filtration, precipitation, centrifugation, floating and other chemical methods: chemical substances added to the hazardous substances in the sewage chemical reaction transformation process. Neutralization, oxidation, reduction, decomposition, coagulation, chemical precipitation and other physical and chemical methods: physical and chemical separation process. Gas stripping, stripping, adsorption, extraction, ion exchange, electrodialysis, reverse osmosis and other biological methods: microbial oxidation and decomposition of organic matter in the sewage metabolic process. Activated sludge, biofilter, biological turntable, oxidation ponds, anaerobic digestion, etc. According to the chemical methods commonly used in the treatment of wastewater coagulation Add to the gel cloudy liquid electrolyte, aggregate water gel-like substance, and water mixed The coagulant includes oily wastewater such as aluminum sulfate, alum, polyaluminum chloride, ferrous sulfate and ferric chloride, dyeing wastewater, gas station wastewater, scouring wastewater, neutralizing acid-base neutralization, pH neutral lime and limestone , Dolomite and neutralization of acid waste water, CO2 neutralization of alkaline waste water Sulfuric acid plant waste water Lime neutralization, printing and dyeing wastewater redox addition Oxidation (or reduction) agent, the wastewater oxidation (or reduction) of substances into harmless substances Oxidants such as phenol, cyanide, sulfur, chromium and mercury in the air (O2), bleaching powder, chlorine gas and ozone are used in electrolysis to insert electrode plates into the wastewater. After electrification, the charged ions in the wastewater become neutral atoms Power, electrode plates containing chromium cyanide (electroplating) wastewater, wool waste water extraction will be insoluble in water into the waste water, the waste water dissolved in this solvent, and then use the relative density of solvent and water, the solvent Extract solvent: butyl acetate, benzene, N-503 and other equipment Pulsed sieve plate tower, centrifugal extraction machine, etc. Phenol wastewater (including ion exchange) Adsorption of waste water through the solid adsorbent, the dissolved organic or inorganic waste water adsorbent on the adsorbent through the treatment of the adsorbent activated carbon , Cinder, soil adsorption tower, regeneration device dyeing, pigment wastewater, but also adsorption of phenol, mercury, chromium, cyanide and in addition to color, smell, taste, etc. for the depth of treatment.
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