Industry Background | Water Quality Characteristics & Technical Challenges

In wet flue gas desulfurization processes within the petrochemical and power industries, the generated wastewater is typically characterized by high fluoride, high salinity, and high alkalinity. Fluoride concentrations fluctuate between 200 and 500 mg/L, alkalinity (as CaCO₃) exceeds 10,000 mg/L, and total dissolved solids (TDS) exceed 30,000 mg/L. This high-alkalinity, high-salinity, high-fluoride ("three highs") composite wastewater, combined with the common ion effect and excessively high salt content, leads to difficult precipitation and poor removal efficiency. As a result, achieving stable fluoride compliance alongside low-cost, long-term system operation has become a widely recognized technical challenge in the industry.

Innovative Process | Stepwise + Multi-Stage Tandem Defluorination

To address the interference of complex factors in "three highs" wastewater, Hanqi Environment has developed an innovative stepwise + multi-stage tandem defluorination process, guided by the design philosophy of "first rough removal, then fine control, for stable compliance." The first stage is a rough removal unit, and the second is a fine polishing unit. Through stepwise reactions and multi-stage concentration reduction, the system achieves efficient and deep removal of high-concentration fluoride. Each unit incorporates multiple levels of parameter control, ensuring stable compliance while maintaining operational cost-effectiveness.

Innovative Design | Modular Structure & Anti-Scaling Design

To address the scaling and clogging issues commonly caused by "three highs" wastewater, Hanqi has implemented targeted designs in equipment configuration and internal structures, incorporating its proprietary anti-scaling technology to effectively reduce scale deposition rates and ensure long-term, continuous, and stable system operation. The entire system features a modular steel structure, fabricated in the factory and assembled on-site, significantly shortening the construction period.

Project Validation | Stable Compliance & Operational Cost-Effectiveness

Operational feedback from commissioned projects demonstrates that this stepwise + multi-stage tandem defluorination process exhibits strong adaptability to high-alkalinity, high-salinity desulfurization wastewater. Effluent fluoride concentrations are consistently maintained below 30 mg/L, and the system demonstrates robust anti-interference capability and water quality adaptability. This technical approach provides a proven engineering reference for similar industrial wastewater defluorination projects, delivering both compliance reliability and operational controllability.