The main applications of polyaluminum chloride in water include drinking water treatment, wastewater treatment, industrial water treatment, and other specialized uses.

 The application of polyaluminum chloride in water treatment is very extensive, mainly including the following aspects:

1. Drinking water treatment: Polyaluminum chloride can effectively remove suspended solids, organic matter, heavy metals, and other pollutants from water, ensuring the safety and hygiene of drinking water. For example, in urban water supply systems, polyaluminum chloride is often used in the pretreatment and advanced treatment stages to improve water quality.

2. Wastewater treatment: Widely used in the treatment of urban sewage, industrial wastewater, etc., helping to remove chemical oxygen demand (COD), biological oxygen demand, suspended solids, and other pollutants from wastewater. In industrial wastewater treatment, such as papermaking wastewater and dyeing wastewater, polyaluminum chloride can significantly improve the quality of the effluent.