Minimizing the recovery of phosphorus-containing pollutants in the process of wastewater sludge treatment

Summary

To improve the Baltic Sea basin the problem of reducing the concentration of nutrients, phosphorus in particular, in the effluents must be solved. No less important is to prevent bound phosphorus recovery in the subsequent process of activated sludge dewatering. It is shown that minimizing phosphorus recovery during sludge dewatering and preventing secondary pollution of effluents can be ensured by separate thickening of activated sludge and raw sludge; as well as by minimizing the retention time of activated sludge and raw sludge mixture before mechanical dewatering.

Kye words

biological treatment , dephosphatization , activated sludge , eutrophication , secondary pollution , sludge dewatering