1, sewage treatment according to its role can be divided into physical method, biological method and chemical method three.
2, physical method: The main use of physical action to separate the insoluble substances in sewage, in the treatment process does not change the chemical properties. Commonly used are gravity separation, centrifugal separation, reverse osmosis, air flotation and so on. The physical method is simple and economical to treat structures, which is used for the situation of large water capacity, strong self-purification ability and low requirement of sewage treatment degree in villages and towns.
3, biological method: using the metabolic function of microorganisms, the organic matter in the sewage is dissolved or colloidal decomposition and oxidation into stable inorganic substances, so that the sewage is purified. Activated sludge method and biofilm method are commonly used. The degree of treatment by biological method is higher than that by physical method.
4, chemical method: is the use of chemical reaction to treat or recycle sewage dissolved substances or colloidal substances method, mostly used in industrial wastewater. Commonly used are coagulation method, neutralization method, REDOX method, ion exchange method, etc. The chemical treatment method has good treatment effect and high cost, and is mostly used as the effluent after biochemical treatment for further treatment to improve the effluent quality.
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