What are the methods of use and precautions for polymeric aluminum chloride?

The use method and precautions of polymerized aluminum chloride are as follows:

Use method

Dissolution: solid polymerized aluminum chloride should be dissolved in the dissolving pool by adding water and stirring first, and then formulated into a certain concentration of solution, generally formulated into a solution with mass fraction of 5% - 10%. When dissolving, it should be noted that the stirring speed should not be too fast to avoid breaking the flocculating body of polymerized aluminum chloride, and at the same time, it should be ensured that the solution is fully dissolved to prevent the phenomenon of agglomeration.

Dosing: Dose the prepared solution into the water to be treated, the dosage should be determined by experiment according to the water quality. Generally speaking, for drinking water treatment, the dosage is usually 1-10mg/L; for sewage treatment, the dosage may be 10-100mg/L or even higher, depending on the nature and concentration of sewage. The dosage can be continuous or intermittent, and adjusted according to the treatment effect.

Mixing and reaction: After dosing, the polymerized aluminum chloride solution should be fully mixed with water, which can be realized by mechanical stirring, hydraulic stirring and other ways. The mixing time is generally 1 - 3 minutes, so that the agent quickly and evenly diffused into the water. Then enter the reaction stage, the reaction time is usually 15 - 30 minutes, in this process, the flocs gradually formed and grown, easy to subsequent precipitation or filtration separation.

Note

Adaptation range of water quality: Although polymerized aluminum chloride has good adaptability to various water qualities, the optimal dosage and treatment effect of different water qualities are different. For high turbidity water, low temperature and low turbidity water, and acidic or alkaline water, it may be necessary to adjust the dosage or use with other agents to achieve the best treatment effect.

Avoid mixing with other agents: Polymerized aluminum chloride should not be mixed with alkaline agents such as lime, bleach and reducing agents such as ferrous sulfate, otherwise chemical reaction may occur, affecting the flocculation effect. If you need to use a variety of agents, you should pay attention to the order of dosage and interval time, usually the first dosage of polymerized aluminum chloride, to be flocculation reaction is completed, and then dosage of other agents according to the need.

Selection of equipment material: polymerized aluminum chloride solution has a certain corrosive, so the storage and dosing equipment should be made of corrosion-resistant materials, such as plastic, glass fiber reinforced plastic, stainless steel, etc. Avoid the use of iron or aluminum equipment. Avoid the use of iron or aluminum equipment to prevent corrosion damage to the equipment, but also to avoid metal ions mixed into the water, affecting water quality.

Safety protection: operators should wear protective equipment, such as masks, gloves, goggles, etc., when using polymerized aluminum chloride. If the skin comes into contact with the agent, it should be rinsed with a lot of water immediately; if it splashes into the eyes inadvertently, it should be rinsed with water immediately and seek medical treatment in time. In addition, polymerized aluminum chloride should be stored in a cool, dry, well-ventilated place, away from fire and heat sources, avoid direct sunlight.