Detailed Description of Polyferric Sulfate (PFS) Product

Polyferric Sulfate (PFS for short) is a new type of high-efficiency inorganic polymer flocculant, prepared by advanced processes such as catalytic oxidation. Its molecular formula is (Fe₂(OH)ₙ(SO₄)₃₋ₙ/₂)ₘ (where n < 2 and m > 10). It appears in two forms: reddish-brown viscous liquid and light yellow powdery solid. It has core advantages such as high water purification efficiency, wide application range, economic cost, environmental friendliness and no secondary pollution. It is widely used in water treatment, light industry manufacturing, chemical production and other fields. The following is a comprehensive and detailed explanation from aspects such as the core characteristics, uses, specification parameters, quality standards, usage methods, packaging and storage, and multi-dimensional picture display of the product.

I. Core Characteristics of the Product

As a high-efficiency inorganic polymer flocculant, polyferric sulfate has the following significant characteristics compared with traditional iron salt and aluminum salt flocculants, which are the core advantages for its wide application in various fields:

High-efficiency flocculation and rapid sedimentation: It has a high charge density of 150-180 meq/g. After hydrolysis, it generates a large number of polynuclear hydroxyl complex ions, which can quickly adsorb suspended particles and colloidal impurities in water, compress the colloidal electric double layer, and promote the impurities to coagulate into large and dense flocs (which can be formed in 30-60 seconds). The sedimentation speed reaches 12-18 m/h, which is 3-5 times faster than traditional ferric sulfate, greatly improving the water treatment efficiency.

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• Excellent phosphorus removal performance: It can chemically react with phosphate in water to form water-insoluble iron phosphate precipitates, with a total phosphorus removal rate as high as 95-99%. It is the preferred agent for upgrading and transforming municipal sewage treatment plants and removing phosphorus from aquaculture wastewater, and can effectively prevent the occurrence of water eutrophication (algal blooms, red tides)[3].

  
  

  Wide range of applications: It has an effective pH adaptation range of 3-11, can maintain more than 85% activity even at low temperatures (2℃), and can treat various water qualities such as acidic, neutral, and weakly alkaline water. Whether it is low-turbidity water, high-turbidity water, industrial wastewater, or domestic sewage, it can stably exert purification effects without the need for additional adjustment of water pH value.
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• Environmental protection economy, no secondary pollution: It does not contain harmful components such as aluminum and chlorine. The residual iron ion content in the treated water is low, and no secondary pollution will be generated; the sludge output is 30-40% less than that of aluminum salts, reducing the cost of sludge treatment; the cost per ton of water treatment can be saved by 0.05-0.12 yuan, with outstanding cost performance.

  
  

  Low corrosiveness, safe to use: The corrosiveness is 50% lower than that of ferric chloride, causing little loss to water treatment equipment and pipelines, and no special anti-corrosion measures are required during operation; at the same time, strong oxidizing hydroxyl radicals will be generated during the hydrolysis process, which also has a certain sterilization and disinfection effect, improving water quality safety [3].

  
  

  Multifunctional integration: In addition to the core flocculation and water purification, it also has functions such as decolorization, deodorization, complex breaking, and sludge conditioning. It can effectively remove chromaticity (decolorization rate 80%-98%) and peculiar smell in industrial wastewater, destroy complexes in electroplating wastewater, improve sludge dewatering performance, and adapt to multi-scenario needs [4].
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• II. Product Uses
  
  
  Thanks to its excellent performance, polyferric sulfate has applications in various fields such as water treatment, light industry manufacturing, chemical industry, and agriculture. The specific uses are as follows:

(1) Water Treatment Field (Core Application)

1. Drinking water treatment: Suitable for the purification of raw water such as reservoir water, river water, and groundwater. It can efficiently remove impurities in water such as sediment, humus, algae, and bacteria, with good flocculation and clarification effects. The treated water quality meets GB 5749-2022 "Standards for Drinking Water Quality". It is especially suitable for the purification treatment of low-temperature and low-turbidity water, and is a high-quality agent for drinking water pretreatment. It is necessary to select first-class products of drinking water grade[4][8].

   
   
2. Municipal sewage treatment: mainly used for phosphorus removal, turbidity removal, decolorization, and COD removal in urban domestic sewage. For pollutants such as suspended impurities, organic debris, and phosphate in domestic sewage, it can quickly achieve solid-liquid separation, helping sewage treatment plants meet the effluent standards (in line with GB 18918 - 2002 "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant"). It is one of the core agents for upgrading and transforming municipal sewage treatment plants [3].

   
   

3. Industrial wastewater treatment: Widely used in wastewater treatment for industries such as printing and dyeing, papermaking, electroplating, chemical engineering, metallurgy, coal washing, leather, spraying, and animal husbandry:

   
   

   Printing and dyeing wastewater: Removes dye pigments, suspended solids, and COD from wastewater, with a decolorization rate of 80%-98%. When used with a small amount of cationic PAM, the treatment effect is better;

   
   

   Electroplating wastewater: Acts as a coagulant and complex breaker, effectively treating stable complexes such as copper-ammonia complexes and removing heavy metal ions (such as copper, chromium, lead, etc.) from water;

   
   

   Papermaking wastewater: Removes pulp debris and suspended solids, improves wastewater chromaticity, and can also be used as a sludge conditioner to enhance sludge dewatering efficiency;

   
   

   Chemical and metallurgical wastewater: Removes heavy metal ions and suspended impurities from wastewater, reduces wastewater turbidity and COD, and helps enterprises discharge wastewater up to standard [4][7][9].

   
   

   Other water treatments: Including landscape water purification, landfill leachate treatment, aquaculture water (fish ponds, shrimp ponds) purification, etc., which can remove suspended solids in water, reduce ammonia nitrogen and phosphorus content, improve the water environment, and reduce the growth of bacteria [7].

   
   

   (2) Light Industry Manufacturing Field

   

   Pulp and Paper Industry: As an efficient deinking agent, in waste paper recycling processing, it can promote the rapid agglomeration and sedimentation of ink particles, realize the separation of pulp and ink, and improve the purity of recycled pulp; at the same time, it can be used as a papermaking wet-end additive to enhance the bonding force of paper fibers and improve the strength and stiffness of paper [7].

   
   

   Cellulose Product Processing: In the production of cellulose boards and fiber fabrics, as a modifier and bonding additive, it can improve the corrosion resistance, wear resistance and flame retardancy of products, enhance the forming performance of slurry, and improve the quality of products.

   
   

   (III) Chemical Engineering and Materials Field

   

1. Dye industry: As a core raw material for the preparation of iron-based dyes (such as iron oxide red and iron oxide yellow), it can produce inorganic pigments with bright colors and strong weather resistance through modification reactions, which are widely used in textile dyeing, coating manufacturing, architectural decoration and other fields.
   
   
   Metal surface treatment: As a metal surface pretreatment agent, when prepared into a solution of specific concentration and applied or soaked on metal workpieces, it can form a dense protective film on the metal surface, isolating corrosive media such as air and moisture, preventing metal oxidation and rusting, and at the same time improving the adhesion of subsequent coatings [7].
   
   
   Other uses: In catalyst preparation, it is used as an iron source carrier to synthesize high-efficiency and environmentally friendly catalysts; in the field of battery materials, after purification and modification, it can be used as a precursor for cathode materials of lithium-ion batteries; in the agricultural field, it can be used as an additive for trace element fertilizers to supplement iron elements for plants and improve plant iron deficiency chlorosis symptoms [7].
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3. III. Product quality standards

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2. IV. Usage Methods and Precautions

   
   

   (1) Usage Methods

   
   

   Liquid polyferric sulfate: It can be directly dosed, or diluted 1-5 times according to water quality conditions before dosing; the dosage is adjusted according to the turbidity and pollutant concentration of the raw water. Generally, the dosage for domestic drinking water treatment is 10-30mg/L, for industrial wastewater treatment is 30-100mg/L, and for municipal wastewater treatment is 30-80mg/L. It is recommended to determine the optimal dosage through laboratory small-scale tests [7].

   
   

   Solid polyferric sulfate: It needs to be first formulated into a 10%-30% aqueous solution (stir evenly during dissolution to avoid caking), let it stand for dissolution for 30 minutes, and then dilute to an appropriate concentration according to water quality for dosing; spray-grade products have a faster dissolution rate, which can shorten the dissolution time to 15-20 minutes; after dosing, it is necessary to stir evenly to ensure full reaction between the agent and the water body, and after flocs are formed, let it stand for sedimentation or filter separation [7].

   
   

   Auxiliary use: When treating high-concentration and high-chroma industrial wastewater, a small amount of polyacrylamide (PAM) can be used in combination to improve the flocculation and sedimentation effect; when treating acidic wastewater, the pH value of the water body can be appropriately adjusted to 6-9 to optimize the purification effect [7].

   
   

   (2) Precautions

   
   

   Operators must wear protective equipment such as gloves, masks, and protective clothing to avoid contact of the agent with the skin and eyes; if contact is accidental, rinse immediately with plenty of water, and seek medical attention promptly in severe cases.

   
   

   The agent should be stored in a cool, dry, and ventilated place, away from fire sources and heat sources, and avoid direct sunlight; liquid products should avoid low-temperature freezing, and solid products should avoid moisture and caking.

   
   

   The agent must not be stored together with alkaline substances, flammable and explosive materials, so as to avoid reactions that affect product performance or cause safety hazards.

   
   

   Dosing equipment must be cleaned regularly to avoid residual agent caking, blocking pipelines or equipment; the storage period of liquid products shall not exceed 6 months, and that of solid products shall not exceed 1-2 years. Expired products must be re-inspected and can be used only after passing the inspection.

   
   

   For drinking water treatment, drinking water-grade (Type I) products must be selected. After dosing, it is necessary to ensure that the iron residue in the water meets the GB 5749-2022 standard to avoid affecting the taste and safety of drinking water.

   
   
3. V. Packaging and Storage

   
   

   (1) Packaging Specifications

   
   

   Liquid Polyferric Sulfate:

   
   

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   2. Small packaging: 25kg/plastic bucket (food-grade plastic, suitable for drinking water-grade products), 50kg/plastic bucket, with sealed bucket mouths to prevent leakage;
      
      
      Large packaging: 200kg/plastic bucket, 1000kg/ton bucket, or transported by tank truck (suitable for bulk purchases, tank trucks must be dedicated to avoid mixing with other chemicals);
      
      
      Packaging labels: Clearly mark information such as product name, model (Type Ⅰ/Type Ⅱ), implementation standards, total iron content, production date, batch number, manufacturer, warning signs (corrosive), storage requirements, etc.
      
      
      Solid polyferric sulfate:
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   2. Ordinary packaging: 25kg/woven bag (with inner polyethylene plastic bag, double-layer packaging, moisture-proof and leak-proof), 50kg/woven bag;

      
      

      High-end packaging: 25kg/laminated woven bag (special for spray-grade products, with better moisture-proof performance), or customized packaging (according to customer needs);

      
      

      Packaging labeling: Clearly mark product name, model, implementation standard, total iron content, particle size, production date, batch number, manufacturer, warning signs, storage requirements and other information.

      
      

      (2) Storage requirements

      
      

      Storage environment: Cool, dry, ventilated, with temperature controlled at 5-35℃, avoiding direct sunlight, rain, and high-temperature exposure; liquid products need to take anti-freezing measures in winter to prevent freezing (freezing will affect product performance).

      
      

      Stacking requirements: The stacking height of solid products shall not exceed 10 layers to avoid extrusion and caking; when stacking liquid products, the barrel mouth shall be upward to avoid dumping and leakage, and keep a distance of more than 10cm from the ground and wall for ventilation.

      
      

      Shelf life: The shelf life of liquid products is 6 months, and that of solid products is 1-2 years (the shelf life of spray-grade products is 18 months); products that exceed the shelf life need to be re-inspected for various indicators, and can be used only if they are qualified; unqualified products are prohibited from use.

      
      

      Transportation requirements: Avoid collision, extrusion, exposure to sunlight and rain during transportation; avoid dumping and leakage of liquid products, and avoid moisture and damage of solid products; transport vehicles must have corresponding protective measures, stay away from fire sources and heat sources, and it is strictly forbidden to mix transportation with alkaline substances, flammable and explosive materials.
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   4. VI. Summary of Product Advantages

      
      

      As a new type of high-efficiency inorganic polymer flocculant, polyferric sulfate has multiple advantages such as high efficiency, environmental protection, economy, and a wide range of applications. Compared with traditional flocculants, it has a faster flocculation speed, better phosphorus removal effect, less sludge production, and lower corrosivity. It can be widely adapted to the purification needs of multiple scenarios such as drinking water, municipal sewage, and industrial wastewater. At the same time, it can also be applied in fields such as light industry, chemical industry, and agriculture to achieve multi-functional utilization. The product quality strictly complies with national standards, with clear classification, standardized packaging, and convenient storage. It can provide customers with stable and cost-effective solutions for water purification and industrial additives, helping enterprises meet environmental protection standards, reduce costs and increase efficiency, and promote green and low-carbon development.