Zibo Dingqi Chemicals Co., Ltd. is one of the most experienced manufacturers and suppliers of drinking water grade polyaluminum chloride in China. Welcome to wholesale high quality drinking water grade polyaluminum chloride made in China here from our factory. For price consultation, contact us.
Content Requirements for Drinking Water Grade Polyaluminum Chloride (PAC)
Compared to industrial-grade PAC, drinking water grade PAC has stricter requirements for purity, heavy metal residues, and impurity content, complying with national standards for drinking water treatment chemicals (e.g., China Standard GB 15892-2020). Key specifications include:
Aluminum Oxide (Al₂O₃) Content:
- Requirement: ≥29%–31% (mass fraction), ensuring high coagulation efficiency.
- Testing Method: Determined via chemical titration or instrumental analysis.
Limits for Heavy Metals and Harmful Substances:
- Arsenic (As): ≤0.0005% (5 mg/kg);
- Lead (Pb): ≤0.001% (10 mg/kg);
- Cadmium (Cd): ≤0.0002% (2 mg/kg);
- Mercury (Hg): ≤0.00001% (0.1 mg/kg);
- Hexavalent Chromium (Cr⁶⁺): Not detectable.
Basicity (Degree of Alkalinization):
- Range: 45%–85%, optimal at 50%–70% to adapt to varying water quality conditions.
- Function: Excessive basicity increases aluminum residue, while insufficient basicity reduces coagulation efficacy.
pH Value (1% Aqueous Solution):
- 3.5–5.0, moderately acidic to avoid corrosion of water supply pipelines.
Water-Insoluble Matter Content:
- ≤0.5%, minimizing risks of pipeline clogging or residue.
Specific Applications of Drinking Water Grade PAC
Purification in Water Treatment Plants
Coagulation and Sedimentation:
- PAC adsorbs colloidal particles (e.g., clay, microorganisms, organic matter) via electroneutralization, forming large flocs for rapid sedimentation.
Turbidity and Color Removal:
- Reduces suspended solids and humic acids, lowering turbidity to ≤1 NTU.
- Effective in decolorizing high-color water (e.g., algae-rich or iron/manganese-contaminated water).
Trace Pollutant Removal:
- Co-precipitates bound heavy metals (e.g., Pb, Cd).
- Reduces disinfection byproducts (e.g., trihalomethanes) when combined with chlorine.
Rural Drinking Water Safety Projects
- Used in small-scale centralized water stations or emergency purification to treat high-turbidity surface water (e.g., rivers, reservoirs).
Pretreatment for Bottled and Direct Drinking Water
- Reduces turbidity and organic content in raw water, extending the lifespan of downstream activated carbon or membrane filters.
Swimming Pool Water Treatment
- Removes suspended impurities and colloids, maintaining water clarity (residual aluminum must be controlled at ≤0.2 mg/L).
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