LIGHT EXPANDED CLAY AGGREGATES FOR PHOSPHORUS REMOVAL

摘要

Sintered light expanded clay aggregates are described that are prepared by expanding and firing a clay-based material, and where the finished aggregates have a diameter of up to about 32 mm, for use as filtration medium for purifying water, wherein carbonates of calcium and/or magnesium are added to the clay as flux material prior to expansion and firing. Uses of the expanded clay aggregates for removing phosphorous by utilising the clay aggregates are also described, as well as a method for removing phosphorus by using the clay aggregates.