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Whitle polyaluminum chloride powder for drinking water treatment
Content
- Usage PReference standard: China National standard GB/T 22627-2014 "water treatment agent polyaluminum chloride".
Core indicators
|
Item |
Liquid (Grade I) |
Solid (Grade I) |
|
Alumina (Al₂O₃) content |
≥10.0% |
≥29.0% |
|
Basicity |
40%-90% |
40%-90% |
|
Water insoluble matter content |
≤0.1% |
≤0.3% |
|
pH value (10g/L solution) |
3.5-5.0 |
3.5-5.0 |
|
Heavy metals (such As Pb and As) |
≤0.001% |
≤0.001% |
| White poly aluminum characteristics: May be a high purity product, less insoluble matter (≤0.1%), Al₂O₃ content is higher (≥30%) | ||
Recautions
Dosage Control:
- Adjust dosage based on raw water turbidity (typically 5–50 mg/L). Overdosing may cause excessive aluminum residue (national standard: ≤0.2 mg/L).
- Conduct bench-scale tests (e.g., jar tests) to determine optimal dosing.
Risk Mitigation:
- Aluminum Residue: Long-term excessive intake poses health risks. Optimize coagulation (e.g., adjust pH to 6.5–7.5) or use post-filtration (sand filtration, ultrafiltration) to reduce residues.
- Dosing Sequence: Apply PAC first for coagulation, followed by chlorine disinfection to avoid chemical interference.
Storage and Transportation:
- Store in sealed, dry conditions away from alkaline substances.
- Liquid PAC must avoid freezing; solid PAC typically has a 2-year shelf life.
Synergistic Use with Other Agents
- Combination with Polyacrylamide (PAM): Sequential dosing (PAC first, then PAM) reduces PAC consumption and enhances floc strength.
- Combination with Activated Carbon: PAC removes colloids, while activated carbon adsorbs dissolved organic pollutants.
International Standards Comparison
- WHO (World Health Organization): Mandates residual aluminum in drinking water ≤0.2 mg/L, consistent with China's standard.
- EPA (U.S. Environmental Protection Agency): Requires aluminum-based coagulants to comply with NSF/ANSI 60 certification (food-safe grade).
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