Flocculants for wastewater are mainly used to promote the coagulation and flocculation process of suspended solids and colloidal particles in wastewater, so as to more easily separate these pollutants from wastewater and ultimately achieve the purpose of purifying wastewater. Flocculants are usually divided into two categories: inorganic flocculants and organic flocculants
Flocculant. 1.Inorganic flocculants:
It mainly includes aluminum salts (such as aluminum sulfate, polyaluminum chloride, etc.), iron salts (such as ferrous sulfate, polyferric sulfate, etc.). This type of flocculant destabilizes the particles by neutralizing the negative charge in the wastewater, and then the flocculation reaction occurs, resulting in large particles that are easy to precipitate.
2.Organic flocculants:
Including synthetic polymer flocculants, such as polyacrylamide (PAM), polydimethyldiallylammonium chloride (PDMDAAC), etc., as well as natural modified polymer flocculants such as chitosan and its derivatives. This kind of flocculant has the characteristics of high efficiency and wide range of application, which can significantly reduce the repulsion between particles in water, and promote the flocculation between particles to form larger flocs.
In practical applications, the selection of the right flocculant should take into account the specific properties of the wastewater, such as pH, temperature, turbidity, pollutant type and concentration, and other factors. At the same time, it is sometimes necessary to combine different types of flocculants or in combination with coagulants to optimize the flocculation effect and improve the overall efficiency of wastewater treatment. The flocculation process is often a critical step in the wastewater treatment process, often in the pretreatment stage, the advanced treatment stage after biochemical treatment, and the conditioning stage before sludge dewatering.
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