PURIFICATION OF WASTE WATER

摘要

This invention describes a process for purifying waste water including reduction of the chemical and biological oxygen demands needed in connection with any further purification thereof which comprises the steps of admixing the waste water with one or more flocculating agents to effect separation of the majority of the colloidal components and passing the resultant admixture under gravity through a fabric located in a suspension device whereby a combined filter is formed comprising a) the fabric and b) a primary filter layer of alluvial solids, thereby to effect preclarification of the waste water and the removal of the majority of the particles of solids including flocculated colloidal components from the aqueous phase, and an apparatus wherein the purification of the waste water is processed.