What are the commonly used phosphorus removal agents and flocculants
May 27,2024
Common phosphorus removal agents mainly include:
1. Inorganic metal salts:
Aluminum salts, such as polyaluminum chloride (PAC), aluminum sulfate, etc., can combine with phosphate ions to form insoluble precipitates.
Iron salts, such as polyferric sulfate (PFS) and ferrous sulfate, can also react with phosphates to form insoluble precipitates.
2. Composite phosphorus removal agent:
A composite formulation containing specific ratios of aluminum and iron salts can improve phosphorus removal efficiency and adapt to a wider range of wastewater conditions.
3. Other types:
Lime (Ca (OH) ₂) can also serve as an auxiliary phosphorus removal agent, reacting with phosphate under certain conditions to form calcium phosphate precipitate.
Coagulants include but are not limited to:
1. Inorganic flocculant:
Aluminum salt series: In addition to the aluminum salts mentioned above for phosphorus removal, there are also high molecular weight aluminum flocculants such as aluminum silicate and sodium aluminate.
Iron salt series: such as polymeric ferric sulfate, ferric chloride, etc., not only have flocculation effects, but can also be used for phosphorus removal.
2. Organic polymer flocculant:
Polyacrylamide (PAM) and its derivatives are classified into cationic, anionic, and nonionic types based on their charge properties, and are widely used in various wastewater treatments to accelerate the aggregation and sedimentation processes between particles.
Other types of synthetic or naturally modified organic polymer flocculants, such as chitosan, modified starch, etc.
In practical applications, the selection of phosphorus removal agents is often combined with coagulants to promote the removal of suspended solids and dissolved phosphorus in wastewater.
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