Serious pollutants contained in plastic factory wastewater include: formaldehyde, benzene. Compare measures and suggestions for wastewater treatment. Inorganic pollutants such as toluene, ethanol, and chloroform. Characteristics of plastic factory wastewater: huge water quality, large pollution, and difficult to treat.

The method of using polyaluminum chloride in plastic factory wastewater treatment is as follows:

1. It is necessary to prepare a 3%-5% aqueous solution in advance.

2. Dissolve the powdered polyacrylamide in a stirring tank.

3. Add the prepared PAC solution to the sewage while stirring, and constantly test the pH value of the water quality.

4. When the pH value of the water reaches weak alkalinity, add polyacrylamide to dissolve, and the normal addition amount is 0.5%.