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Commonly used flocculants in water treatment

Country/Region china
Company Xi’an Xinshengtai(XST) Water Treatment Techonology Co. Ltd
Categories Water Treatment Flocculant
ICP License Issued by the Chinese Ministry
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    Commonly used flocculants in water treatment

    An inorganic coagulant

    1. Low molecular inorganic coagulant

    The most widely used simple inorganic flocculants are iron and aluminum metal salts. Mainly ferric chloride, ferrous sulfate and aluminum sulfate.

    Ferric chloride (Fe: commonly used in the formation of ferric chloride hexahydrate (FeCl3 6H20), the precipitation of a good, low-temperature water or low turbidity water treatment is better than aluminum salt, a wide range of suitable pH value, However, the color of treated water is higher than that of aluminum and corrosive.

    Ferrous sulfate (FeS04H20) dissociates Fe2+ and produces only the simplest mononuclear complexes, which is not as good as divalent iron salts.

    Aluminum sulfate (Al2(S04)3) is the most used flocculant in wastewater treatment. It is easy to use and has good flocculation effect. When the water temperature is low, it is difficult to be hydrolyzed and the formed floc is loose. Its effective pH range is narrow.

    Mingji (Al2(S04)3K2S04.24H20) has the same mechanism as aluminum sulfate [14].

    2. Inorganic polymer flocculant

    Inorganic molecular flocculants have a high coagulation effect and low price, and have gradually become the mainstream pharmaceutical agents. The development of such flocculants in China is remarkable.

    Inorganic polymer flocculants are of cationic type, such as polyaluminum chloride (PACL polyaluminum sulfate (PAS), polyaluminum phosphate (PAP), polyferric sulfate (PFS), polyferric chloride (PFC), polyferric phosphate (PFP), polyferrous and anionic, such as polymeric silicic acid [PS] [15].

    Polyaluminum Chloride (PAC): It can achieve good flocculation effect on various wastewaters, can quickly form large silk flowers, has good precipitation performance, and has a wide range of suitable pH values (pH is between 5 and 9), and After treatment, the pH and alkalinity of the water decrease less.

    When the water temperature is low, a stable flocculation effect can still be maintained, and its degree of alkalization is higher than other aluminum salts and iron salts, so that the chemical liquid has little effect on the erosion of the equipment.

    Polymeric Ferric Sulfate (PFS): The formation of the coagulant is fast, dense and of high quality and the sedimentation speed is fast. Especially for low temperature and low turbidity water, it has excellent treatment effect. It is suitable for the pH range of the water (pH is between 4 and 11), and has low corrosion.

    Experiments show that using poly-iron to purify water can reduce the content of nitrous nitrogen and iron. Therefore, it is an excellent and safe drinking water coagulant, and it has a tendency to replace polyaluminum coagulants that are harmful to the human body.

    Polyferrous: Reduces high-valent metal ions to low-valent metal ions without acidification. The coagulant has the dual functions of charge neutralization and adsorption bridging in the water body. In common with the active agent, the colloidal substance can be converted into a coagulant, and at the same time, metal ions such as Cu, Zn, and Ni in the waste water are removed, and it becomes an efficient electroplating waste water purifier.

    Polyaluminum sulphate (PAS): The turbidity removal effect is significant, and there is a wide range of temperature use and application of raw water. Not only industrial water but also industrial wastewater can be treated. Polymeric aluminum sulfate coagulants have been reported abroad.

    Polymeric silicic acid (PS): The factors affecting the preparation method, polymerization mechanism, and polymerization degree of polysilicic acid have been studied thoroughly. Studies have found that the difference in pH achieved by neutralization can be used to control the polymerization rate.

    Polysilicic acid has a strong adhesive aggregation and adsorption bridging. Yang Xiu et al. [16] studied the gelling properties of polysilicic acid and proved that polysilicon is anionic. The biggest drawback of polysilicic acid is that the nature of the product is not stable and it cannot be an independent commodity.

    organic polymer coagulant

    The organic polymer coagulant has the advantages of minimum use, high coagulation speed, small influence of salt, pH and temperature, less sludge generation and easy handling, and has broad application prospects. Currently used coagulants are mainly synthetic and natural modification.

    Polyacrylamide: Among the synthetic organic polymer flocculants, polyacrylamide is the most widely used. Polyacrylamides are nonionic, cationic and anionic. Their molecular weight is between 5-6 million.

    Due to the presence of a certain amount of residual monomer acrylamide in such flocculants, inevitably toxicity is introduced. High molecular weight (above 106) polyacrylic nano-anionic coagulant, strong coagulation and non-toxic.

    The polyacrylic acid nanopa

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