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Three Major Methods Of Wastewater Treatment

  Three major methods of wastewater treatment


  The waste water treatment method, which is separated by physical action and recycled in the waste water, which contains the suspended state pollutants (including oil film and oil beads), can be divided into gravity separation method, centrifugal separation method and sieve-filter interception method. The treatment method based on the principle of heat exchange also belongs to the physical treatment method.


  By chemical reaction and mass transfer to separate and remove the dissolved, colloidal state of pollutants in the wastewater or to convert it to harmless substances in the wastewater treatment method. In chemical treatment, the treatment unit based on chemical reaction of adding medicament is: coagulation, neutralization and redox, and the treatment unit based on mass transfer is: extraction, stripping, blowing, adsorption, ion exchange, electrodialysis and reverse osmosis. The latter two processing units are called membrane separation technology. The process unit using mass transfer has both chemical and related physical functions, so it can be separated from the chemical treatment and become another kind of treatment method called Physicochemical method.


  Through the metabolic action of microorganisms, the organic pollutants in the wastewater, such as solution, colloid and micro suspension, are transformed into a stable and harmless waste water treatment method. According to the different microorganisms, the biological treatment method can be divided into two types: aerobic biological treatment and anaerobic biological treatment. Wastewater biological treatment is widely used in aerobic biological treatment method, according to the traditional aerobic biological treatment method is divided into activated sludge and biofilm method two categories. Activated sludge method itself is a processing unit, it has a variety of operating methods. The treatment equipment belonging to Biofilm method has biological filter, biological turntable, biological contact oxidation tank and biological fluidized bed. Biological oxidation pond is also called natural biological treatment method. Anaerobic biological treatment method, also known as biological reduction treatment, is mainly used to treat high concentration organic wastewater and sludge. The processing equipment used is mainly the digestive pool.

  The biological contact oxidation process is used to treat the waste water, that is, the bio-contact oxidation technology is used to fill the filling in the biological reaction tank, and all the fillers have been filled with the oxygenated sewage, and flow through the filler at a certain velocity. Filled with biofilm, sewage and biofilm extensive contact, in the biofilm on the role of microbial metabolism, sewage organic pollutants are removed, sewage purification. Finally, treatment of wastewater discharged into biological contact oxidation treatment system and domestic sewage mixed after treatment, chlorine disinfection standard discharge. Biological contact oxidation method is a biofilm process between activated sludge and biofilter, which is characterized by the setting of fillers in the pool, the aeration of the bottom of the pond is filled with oxygen, and the sewage in the pool is in the flowing state to ensure the full contact of the sewage with the filler in the sewage, to avoid the defects of the contact between the sewage and the filler in the biological contact oxidation tank.

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