Teodorescu, MariaMariaTeodorescuGrosu, EcaterinaEcaterinaGrosuMarhan, RodicaRodicaMarhanGrindean, CornelCornelGrindean2017-04-192017-04-192000-12-29Patent no. RO116272­-B1http://hdl.handle.net/123456789/846Patent Assignee Name(s) and Code(s): INST CERC PROI EPURAREA APELOR REZIDUALE; ECOIND INST NAT CERC ­DEZVOLTARE ECOLOGIEEffluent containing 20-­80g/l suspensions of which 50­-70% is clay is treated at pH=7.5-­8.5 with a strongly turbulent solution consisting of an aqueous solution of 0.1 % medium anionic acrylamide/acrilate polyelectrolyte in 50g/l calcium chloride, i.e. 3­-9 mg/l polyelectrolyte dose, obtaining after 10-­15 minutes decanting, a clear supernatant with 100 mg/l suspensions and a 15-­25% lower sludge volume than volume of treated effluent.en-USTreatmentWastewaterCoal industryPatent