Overview
Ferric Polysulfate Solution (PFS) is an inorganic polymer coagulant synthesized through the catalytic oxidation of ferrous sulfate. It has largely replaced traditional aluminum salts in many water treatment applications due to its superior coagulation efficiency, wider pH adaptability, and lower environmental impact. The solution form allows for easier dosing and handling compared to solid coagulants. As a highly charged cationic polymer, PFS effectively neutralizes negatively charged colloids in water, forming dense flocs that settle rapidly. Its molecular structure contains multiple iron-hydroxyl complexes that enhance adsorption and bridging effects, making it particularly effective for treating high-turbidity water and industrial effluents.
Physical and Chemical Properties
The reddish-brown solution typically has a density of 1.45-1.50 g/cm³ and contains 11-13% iron by weight. Its polymerization degree (m value) and basicity (n value) significantly influence performance - commercial products usually have a basicity of 8-16%. The solution is strongly acidic with pH around 1-2 but remains stable for 6-12 months when properly stored. Unlike monomeric iron salts, PFS maintains effectiveness across a broad pH range (4-11) without requiring pH adjustment in most cases. It shows excellent temperature resistance and works well in both cold and warm water conditions. The hydrolysis products create less soluble residual iron compared to conventional ferric chloride, reducing post-treatment requirements.
Main Applications
Municipal water treatment plants extensively use PFS for drinking water purification, where it outperforms aluminum salts in removing turbidity, color, and organic matter while leaving lower metal residuals. In wastewater treatment, it effectively removes phosphorus (to <0.5 mg/L) and heavy metals through co-precipitation, meeting stringent discharge standards. Industrial applications include paper mill wastewater treatment (reducing COD by 60-80%), textile effluent decolorization, and mining wastewater metal removal. The construction industry employs PFS for sludge dewatering, achieving higher cake solids than conventional coagulants. Emerging uses include soil stabilization and odor control in waste processing facilities.
Safety and Storage
As a strongly acidic solution, PFS requires careful handling with chemical-resistant gloves, goggles, and protective clothing. Spills should be neutralized with alkaline materials (e.g., sodium carbonate) and washed with copious water. Storage tanks should be lined with rubber or PE to prevent corrosion, with ventilation to avoid vapor accumulation. The product should be kept away from alkaline substances to prevent precipitation. During winter in cold climates, storage areas should be heated to prevent freezing (freezing point around -10°C). Bulk transportation typically uses HDPE containers or rubber-lined tankers. Shelf life can be extended by avoiding direct sunlight and temperatures above 40°C.
B2B Procurement Guide
When sourcing PFS, verify the iron content (typically 11-13% as Fe), basicity (optimal 10-14%), and impurity levels (especially heavy metals for drinking water applications). Request product certification for NSF/ANSI Standard 60 if used in potable water treatment. Bulk purchases (20+ tons) typically offer 15-30% cost savings. Evaluate suppliers' production capacity and quality control measures, as inconsistent polymerization can affect performance. Consider logistics - the solution's corrosive nature requires specialized transport. Many suppliers offer technical support for dosage optimization (typically 10-100 ppm depending on water quality). Sample testing with actual wastewater is recommended before large-scale procurement.
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