How is Potassium alum used in wastewater treatment?

  • By:TBL
  • Date:2024/06/05

Potassium alum is a natural mineral that has water purifying properties. In sewage treatment, Potassium alum is often used to remove suspended solids, impurities and odors from water. This article will introduce in detail the steps and methods of using Potassium alum to treat sewage, aiming to help readers understand this practical technology.


Step 1: Prepare container and Potassium alum

First, prepare a container, such as a plastic bucket or stainless steel bucket, and an appropriate amount of Potassium alum. Put alum into a container and add appropriate amount of water to dissolve it. Note that the water used should be clean water to avoid impurities affecting the dissolution of Potassium alum.

Step 2: Add sewage

Start the equipment, slowly add the sewage to be treated into the Potassium alum aqueous solution, and stir thoroughly to fully mix the Potassium alum aqueous solution and sewage. After mixing, let it sit for a while to allow large particles in the sewage to settle naturally. 


Step 3: Dissolve the Potassium alum again

Separate the precipitated sewage from the Potassium alum aqueous solution, leaving a clear upper liquid. At this time, add an appropriate amount of clean water to the container again, and adjust the concentration of Potassium alum to make it suitable for the concentration range of the current sewage treatment.

Step 4: Add sewage again

Start the equipment and slowly add the sewage to be treated into the Potassium alum aqueous solution again, while maintaining stirring to fully mix the sewage and Potassium alum aqueous solution. Let it sit for a while and observe the changes in the sewage. When the sewage becomes clear, you can proceed to the next step.

Step 5: Clean and Close

Turn off the equipment and clean the containers and equipment for next use. At this time, the sewage that has been treated can be subsequently discharged or reused.


When using alum to treat sewage, you need to pay attention to the following safety issues:

Avoid direct contact with Potassium alum during handling to avoid irritation to skin and eyes.

Maintain appropriate strength during the mixing process to avoid excessive foaming.

Pay attention to the changes in sewage. If the treatment effect is found to be poor, the concentration and amount of Potassium alum can be appropriately adjusted.

Although the treated sewage has reached the discharge standards, direct contact with skin and eyes should be avoided as much as possible.


Potassium Alums plays an important role in sewage treatment. Through the steps and methods introduced in this article, we can effectively use alum to treat various wastewaters. In practical applications, depending on the different properties and concentrations of sewage, the concentration and amount of  Potassium alum may need to be adjusted appropriately. In general, Potassium alum is a practical, efficient and environmentally friendly method for treating sewage, which is of great significance for sewage treatment in homes, businesses and public facilities.




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