Parmac, SorinSorinParmacBuliga, A.A.BuligaCruceru, MihailMihailCruceruDumitrescu, EmilEmilDumitrescuCostov, IoanIoanCostovGhiorghiu, G.G.Ghiorghiu2017-04-232017-04-231985-08-30Patent no. RO 87226-Ahttp://hdl.handle.net/123456789/896Patent Assignee Name(s) and Code(s): INST EPURAREA APELOThe hydroxides formed during coagulation in residual acidic waters, residual acids or unused acids are dissolved. Urea and HCHO are added to the resulting soln. heated to 40 deg.C. The aminoplast formed is washed. The washing waters obtd., together with those resulting from the condensation reaction of the resin, are used in the coagulation of the residual waters.en-USRecoveryCoagulantWastewaterPatent