Coagulation of Danube water with aluminum sulfate?

A field report from switching experiments from iron to aluminum products

Abstract

The Europe-wide shortage of iron-containing coagulants has led to problems in water treatment. The Landeswasserversorgung in Langenau
was forced to study aluminum sulfate as an alternative to ferric chloride sulfate. Laboratory tests were carried out to determine the optimum
operating parameters for the existing flocculation sedimentation plant. A dose of 5 to 6 mg/l Al3+ with resulting pH values of 7.3 to 7.4 delivered good results. In a large-scale trial, the switch to aluminum sulfate was successful, a “plan B” for the future is n