The appearance color of polyaluminum chloride is yellow or light yellow, dark brown, and dark gray, and it is divided into two forms: liquid and solid. This product has strong bridging adsorption performance, and during the hydrolysis process, physical and chemical processes such as coagulation, adsorption, and precipitation occur. This product is widely used in the fields of drinking water, industrial water, and sewage treatment.
Polyaluminum chloride is divided into two types: for drinking water and industrial water, which comply with different relevant standards. Its appearance color is yellow or light yellow, dark brown, and dark gray, and its form is divided into liquid and solid. This product has strong bridging adsorption performance, and during the hydrolysis process, physical and chemical processes such as coagulation, adsorption, and precipitation occur. The fundamental difference between polyaluminum chloride and traditional inorganic coagulants is that traditional inorganic coagulants are low molecular weight crystalline salts, while polyaluminum chloride's structure is composed of multi carboxyl complex compounds with diverse forms. It has a fast flocculation and precipitation rate, a wide range of applicable pH values, and is non corrosive to pipeline equipment. Its water purification effect is obvious, and it can effectively remove color SS, COD, BOD, arsenic, mercury and other heavy metal ions in water. This product is widely used in the fields of drinking water, industrial water, and sewage treatment.
The water purification process of polyaluminum chloride is mainly based on the coagulation principle, which achieves water quality purification through the following three stages:
1. Condensation stage: When polyaluminum chloride is added to water, a large amount of positively charged hydrolysis products are rapidly produced under hydrolysis. These positively charged ions compress the double layer of colloidal particles in water, reducing the electrostatic repulsion between colloidal particles and causing them to attract and collide with each other, forming tiny flocs.
2. Flocculation stage: As hydrolysis continues, the hydrolysis products of polyaluminum chloride will further polymerize to form high molecular weight polymers. These high molecular weight polymers have strong adsorption bridging ability, which can connect the tiny flocs formed during the coagulation stage, like bridges, allowing the flocs to continuously grow and form larger flocs visible to the naked eye.
3. Precipitation stage: Under the action of gravity, the growing flocculent substances will gradually sink to the bottom of the water due to their higher density than water, separating from the water and achieving the goal of removing suspended solids, colloidal impurities, some organic matter, heavy metal ions and other pollutants in the water, thus purifying the water quality.
Indicator Name | Index | |||||
Drinking water | Non potable water | |||||
liquid | Solid | Liquid | Solid | |||
Superior products | First Grade | Superior products | First Grade | |||
Aluminum oxide (AL2O3) content/%≥ | 10.0 | 10.0 | 30.0 | 28.0 | 10.0 | 27.0 |
Iron oxide content (Fe2O3)%≥ | 1.0-2.0 | 1.0-5.0 | 1.0-2.0 | 1.0-5.0 | ||
Basicity％ | 40-95 | 40-95 | 40-95 | 40-95 | 40-95 | 40-95 |
Density（20℃）/(g/cm3)≥ | 1.15 | 1.15 | - | - | 1.15 | - |
Water insoluble content/%≤ | 0.1 | 0.3 | 0.3 | 1.0 | 0.5 | 1.5 |
PH(1% Aqueous solution) | 3.5-5.0 | 3.5-5.0 | 3.5-5.0 | 3.5-5.0 | 3.5-5.0 | 3.5-5.0 |
Ammonia nitrogen (N) content％≤ | 0.01 | 0.01 | ||||
Arsenic (As) content％ | 0.0001 | 0.0002 | ||||
Lead (Pb) content％ | 0.0005 | 0.001 | ||||
Cadmium (Cd) content％ | 0.0001 | 0.0002 | ||||
Mercury (Hg) content％ | 0.00001 | 0.00001 | ||||
Hexavalent chromium (Cr6+)％ | 0.0005 | 0.0005 | ||||
1. Good flocculation effect: Polyaluminum chloride can quickly react with impurities in water, forming large and dense flocs with fast settling speed. It can effectively remove suspended solids, colloids, algae and other pollutants in water, and has good treatment effect on high turbidity raw water and low-temperature low turbidity water, greatly improving water treatment efficiency.
2. Wide adaptability: It can perform well in coagulation under different water quality conditions, with a wide range of pH values, generally between 5-9, and can be used without frequent adjustment of water quality acidity or alkalinity; It has significant purification effects on high turbidity water, low temperature and low turbidity water, high chromaticity water, and polluted source water, and is suitable for various industrial wastewater treatment, urban sewage treatment, and drinking water purification.
3. Easy to use: Polyaluminum chloride can be prepared into solutions of different concentrations according to actual needs for addition. Solid products dissolve quickly, while liquid products can be directly added. The operation is simple and convenient, reducing the workload and technical difficulty of operators.
4. High cost-effectiveness: Compared to other coagulants, polyaluminum chloride has a lower dosage and requires lower chemical costs for treating the same amount of water; And the amount of sludge formed is relatively small, with low sludge moisture content, which facilitates subsequent sludge treatment and further reduces the overall cost of water treatment.
5. High safety: Drinking water grade polyaluminum chloride products undergo strict production processes and quality control, and do not contain harmful substances to the human body. They will not produce secondary pollution during the drinking water treatment process, ensuring the safety of drinking water.
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