Treating muds from wastewater treatment plant, comprises providing lime to treat mud, dehydrating mud to obtain mud presenting dry material rate higher than determined dry material rate, and mixing calcium carbonate with lime and mud

摘要

The method comprises providing a mud having a determined dry material rate, providing a lime in a form of powder and/or liquid to treat the mud, dehydrating the mud to obtain a mud presenting a dry material rate that is higher than the determined dry material rate, and mixing calcium carbonate in powder form with the lime and the mud in a homogeneous way to mineralize the mud. The calcium carbonate is mixed with the lime and the mud before the step of dehydration or after the step of dehydration. A proportion of lime compared to calcium carbonate is 20-70 wt.%. The method comprises providing a mud having a determined dry material rate, providing a lime in a form of powder and/or liquid to treat the mud, dehydrating the mud to obtain a mud presenting a dry material rate that is higher than the determined dry material rate, and mixing calcium carbonate in powder form with the lime and the mud in a homogeneous way to mineralize the mud. The calcium carbonate is mixed with the lime and the mud before the step of dehydration of the mud or after the step of dehydration of the mud. A proportion of lime compared to calcium carbonate is 20-70 wt.%. The calcium carbonate has fine particles of 20 mu m, and percentage of the fine particles is lower than 20%. The method further comprises mixing a salt of iron or aluminum with the mud.