Application scenarios of polyaluminum ferric chloride

2025-07-28

1. Municipal Water Treatment

Drinking Water Purification

Decontamination and algae removal: it can effectively remove suspended solids, algae and colloidal impurities in raw water. It still maintains excellent flocculation effect in low temperature environment (below 5℃), which is suitable for water source treatment in winter.

Heavy metal removal: it has strong adsorption caPacity for toxic heavy metals such as arsenic (As) and lead (Pb), ensuring that the effluent meets the drinking water sanitation standards.

Application in sewage treatment plant

Sludge dewatering: accelerate the sludge settling in primary sedimentation tank/double sedimentation tank, reduce suspended solids (SS) and chemical oxygen demand (COD), and reduce the load of subsequent treatment.

Urban domestic sewage: When treating high turbidity domestic sewage, the floc is formed quickly and compactly, and the settling speed is more than 30% higher than that of traditional coagulants (such as PAC).

2. Industrial wastewater treatment

Papermaking/dyeing wastewater

Decolorization and degradation: effectively remove dye pigments (such as reactive dyes, acid dyes) and lignin, chromaticity removal rate is over 85%, and improve the biodegradability of wastewater.

COD reduction: for high concentration organic wastewater, the dosage is reduced by 20% compared with aluminum sulfate, reducing the treatment cost. Oil and mine wastewater

Oil separation: through the action of charge neutralization to quickly break the emulsion, adsorption of petroleum pollutants, suitable for oil field, machining wastewater.

Mine water purification: remove iron (Fe²⁺), manganese (Mn²⁺), sulfide and other minerals simultaneously, solve the problem of turbidity and heavy metals in mine water.

Food/pharmaceutical wastewater

3. Environmental restoration and ecological management

Black and smelly water treatment

Transparency improvement: rapid precipitation of algae and organic suspended matter, effective improvement of river transparency, inhibit the outbreak of algae.

Rainwater reservoir purification

Low turbidity water treatment: it is more adaptable to the low turbidity water in the rainwater collection system, and the flocculation effect is stable.

4. Usage points and scene adaptation suggestions

Scene characteristics	PAFC superiority	matters need attention
Low temperature turbid water (<5℃)	The hydrolysis rate is fast and the flocs are dense	No additional heating equipment is required
High chromaticity wastewater (printing and dyeing)	The iron salt component enhances the decolorization ability	Control pH 5-10 to avoid iron ion precipitation
Highly oily wastewater	The effect of breaking the milk is good and the sedimentation is rapid	It should be combined with air flotation process to strengthen oil separation
High hardness mine water	Multiple metal ions are removed simultaneously	Check the residual aluminum/iron content regularly

The primary application areas of polyaluminum ferric chloride include water purification (municipal water supply), industrial emission reduction (papermaking, dyeing, and mining), and ecological restoration (treatment of black and odorous water bodies). Its low-temperature efficiency and multifunctionality make it an ideal alternative to traditional coagulants. Specific dosing plans should be determined through pilot tests to avoid over-dosing, which can lead to the re-stabilization of colloids.