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Why Fluoride Wastewater Is Strictly Regulated
High-fluoride wastewater is common in:
- Semiconductor manufacturing
- Etching & surface treatment
- Photovoltaic industry
Fluoride is toxic, cumulative, and strictly limited.
semiconductor wastewater treatment chemicals
How PAC Removes Fluoride
Chemical Reaction Logic
- Al³⁺ reacts with F⁻
- Forms insoluble AlF₃ precipitate
- Removed by sedimentation
This reaction is fast, predictable, and controllable.
Typical Performance Data
| Parameter | Result |
|---|---|
| Influent F⁻ | 14.6 mg/L |
| Effluent F⁻ | 0.4–1.0 mg/L |
| Compliance | Drinking water standard |
Process Design Options
PAC Alone
- Suitable for moderate fluoride levels
PAC + Lime (High Fluoride)
- Lime reduces F⁻ load
- PAC polishes effluent
Dosage Control
| Parameter | Range |
|---|---|
| PAC dosage | 0.5–1.5‰ |
| Optimal pH | 6.0–7.5 |
Overdosing may increase aluminum residual — jar tests required.
Buyer Risk-Control Checklist
- High-purity PAC
- Stable Al³⁺ content
- Verified fluoride removal data
Conclusion
PAC is one of the most reliable and widely accepted chemicals for fluoride removal, especially in high-compliance industries such as semiconductors and photovoltaics.
