Applications of the dissolved air flotation

News 2022年2月17日 258

Flotation had its beginning in mineral processing and as such has been used for a long time in solid/solid separation applications using stable froths to recover the mineral particles. Flotation can be incorporated with wastewater-treatment schemes in the following ways:

(1) As a unit process for removing contaminants not separated by other processes. Examples are found in the removal of metal ions from dilute solutions of the ions and in the selective separation of valuable ions;

(2) As a pre-treatment unit ahead of primary sedimentation, a rougher-flash unit;

(3) As a primary treatment unit ahead of secondary treatment units, such as bio-oxidation lagoons;

(4) As a unit process for sludge thickening.