Introduction

Since the United States first used aluminum sulfate for water treatment and obtained a patent in the late 19th century, aluminum sulfate has been widely used due to its excellent coagulation and sedime…

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Since the United States first used aluminum sulfate for water treatment and obtained a patent in the late 19th century, aluminum sulfate has been widely used due to its excellent coagulation and sedimentation performance. Aluminum sulfate is currently the most used flocculant in the world. The annual output of aluminum sulfate in the world is about 5 million tons, of which nearly half is used in the field of water treatment.

The suitable pH range of aluminum sulfate is related to the hardness of the raw water. When treating soft water, the suitable pH value is 5-6.6, when treating medium-hard water, the suitable pH value is 6.6-7.2, and when treating high-hard water, the suitable pH value is 7.2-7.8. The applicable water temperature range of aluminum sulfate is 20°C ~ 40°C, and the coagulation effect is very poor when it is lower than 10°C. Aluminum sulfate is less corrosive and easy to use, but the hydrolysis reaction is slow, and a certain amount of alkali needs to be consumed.