Application of polymeric ferric sulfate in pharmaceutical wastewater treatment

Polyferric sulfate (PFS) has significant application value in pharmaceutical wastewater treatment. The following is a specific introduction to its application in pharmaceutical wastewater treatment:

1、 Application background

Pharmaceutical wastewater typically contains high concentrations of organic matter, antibiotic residues, heavy metals, and pollutants such as phosphorus. If these pollutants are directly discharged into the environment without treatment, they can cause serious pollution to water bodies and even lead to environmental problems such as eutrophication. Therefore, pharmaceutical wastewater treatment has become an important environmental issue.

2、 Phosphorus removal mechanism

The main function of polymeric ferric sulfate in pharmaceutical wastewater treatment is phosphorus removal. The phosphorus removal mechanism is mainly achieved through chemical precipitation. During wastewater treatment, the iron ions in polymeric ferric sulfate react with phosphate ions (PO ₄³ ⁻) in water to form insoluble iron phosphate precipitates. Subsequently, these precipitates are separated from the wastewater through precipitation or flocculation, thereby reducing the phosphorus content in the wastewater.

3、 Other functions

In addition to phosphorus removal, polymeric ferric sulfate also plays the following roles in pharmaceutical wastewater treatment:

Adsorption of COD substances: After the dissolution of polymeric ferric sulfate, colloids with adsorption and cross-linking properties such as Fe (OH) ∝ and Fe (OH) ₂ ⁺ are generated. These colloids can adsorb COD substances in wastewater and form large flocs that precipitate at the bottom of the water through mechanisms such as electric neutralization and coagulation, thereby removing harmful substances from the water.

Adjusting water quality: Polyferric sulfate does not have a significant impact on the pH value of water, but it can adapt to various water quality with different pH values, and the treatment effect is significant.

Removing metal ions: Polyferric sulfate can also adsorb metal ions in water quality.

4、 Application advantages

The application advantages of polymeric ferric sulfate in pharmaceutical wastewater treatment are mainly reflected in the following aspects:

Efficiency: Polymeric ferric sulfate can quickly form large and dense flocs, which is beneficial for the removal of phosphorus and other pollutants.

Economy: Compared to other phosphorus removal agents, the cost of polymeric ferric sulfate is lower and requires less dosage, which can significantly reduce treatment costs.

Wide applicability: Polyferric sulfate is not only suitable for pharmaceutical wastewater, but also widely used in other types of wastewater treatment, such as printing and dyeing wastewater, electroplating wastewater, etc.

Safety: Polyferric sulfate has low corrosiveness to equipment, is non-toxic and harmless, and is safe and reliable to use.

5、 Precautions

PH control: The coagulation effect of polymeric ferric sulfate is significantly affected by pH value and needs to be adjusted to a suitable pH range (generally 6-9) to achieve optimal efficiency.

Optimization of dosage: Excessive or insufficient dosage can affect the phosphorus removal effect, and the optimal dosage needs to be determined through experiments.

Subsequent processing: The formed precipitate needs to undergo effective solid-liquid separation, such as precipitation, filtration, or centrifugation, to thoroughly remove phosphorus and other pollutants.

6、 Practical application

In practical applications, polymeric ferric sulfate has been widely used in the pretreatment and post-treatment of pharmaceutical wastewater. By reasonable addition and control conditions, polymeric ferric sulfate can significantly reduce the phosphorus content and other pollutant concentrations in pharmaceutical wastewater, improving the effectiveness of wastewater treatment.

In summary, polymeric ferric sulfate has significant application value and broad prospects in pharmaceutical wastewater treatment due to its advantages of high efficiency, economy, safety, and wide applicability.