I. Core Functions of Poly Aluminum Ferric Chloride (PAFC)
Poly Aluminum Ferric Chloride (PAFC), an inorganic polymeric coagulant combining the dual properties of aluminum and iron salts, demonstrates exceptional performance in water treatment due to its unique chemical characteristics:
- High-Efficiency Coagulation and Sedimentation
PAFC achieves rapid coagulation through three mechanisms: charge neutralization, adsorption/bridging, and sweep flocculation. Its hydrolysis generates polynuclear complexes (e.g., [Al(OH)_n]^m+ and [Fe(OH)_n]^m+), which neutralize the negative charges on colloidal particles, compress the electric double layer, and destabilize suspended solids. Compared to traditional coagulants like PAC (Polyaluminum Chloride), PAFC produces denser aluminum-based flocs and faster-settling iron-based flocs, increasing sedimentation rates by 30-50% and reducing settling time to 15-25 minutes. - Broad-Spectrum Pollutant Removal
- Suspended Solids and Colloids: Removes >95% of suspended solids and >85% of colloidal substances.
- Heavy Metals and Phosphorus: Achieves 75-95% removal efficiency for Cu²+, Cr³+, and other heavy metal ions, with phosphorus removal rates of 90-98%.
- Organic Matter and Chromaticity: Reduces COD by 15-30% and removes 85-95% of chromaticity in textile dyeing wastewater.
- Adaptability to Challenging Wastewater
- Low-Temperature/Low-Turbidity Water: Maintains >70% treatment efficiency at 4–20°C, overcoming the limitations of traditional aluminum-based coagulants in cold conditions.
- Oily Wastewater: Effectively adsorbs and captures emulsified oils, making it ideal for industrial oily wastewater treatment.
- Economic and Operational Benefits
- Wide pH Tolerance: Operates effectively across pH 5–10 (vs. pH 6–8 for conventional aluminum salts).
- Cost Efficiency: Dosages range from 20–100 mg/L (10% active content), with 30% chemical cost reduction when combined with PAM. This lowers treatment costs by RMB 0.2–0.5 per ton of water.
II. Technological Innovations and Quality Assurance by Jiangsu Lanyao Water Treatment Co., Ltd.
As a leader in water treatment solutions, Jiangsu Lanyao Water Purification Agent Co., Ltd. (“Lanyao”) excels in PAFC R&D and application:
- Patented Production Technology
Lanyao’s proprietary “Mixing Device for Poly Aluminum Chloride Production” (Patent CN 222324884 U) employs a dual-layer vibrating screen design to optimize solid-liquid reaction stratification, accelerating production speed while ensuring PAFC stability and efficacy. - Rigorous Quality Control
During the 2021 Wuxi Municipal Market Supervision Bureau inspection, Lanyao’s “Poly Aluminum Chloride” products (Brand: Lanyao) met all national standards with a 100% compliance rate, underscoring its commitment to quality. - Comprehensive Technical Support
Lanyao offers end-to-end services, including water quality analysis, coagulant selection, and process optimization. Tailored solutions for municipal wastewater and industrial effluents (e.g., textile, papermaking, petrochemical) leverage PAFC’s advantages to achieve cost-effective, high-performance treatment.
III. Case Studies and Future Prospects
In municipal wastewater treatment, PAFC replaces 40% of traditional coagulants while reducing sludge handling burdens. For industrial clients, Lanyao’s PAFC has been successfully applied in large-scale steel mills and paper factories, ensuring clear, compliant discharge. Looking ahead, as environmental regulations tighten, Lanyao will advance PAFC research in enhancing wastewater biodegradability and micropollutant removal, driving sustainable innovation in water treatment.
