Purifying residual water contg. organic substances by adding urea and formaldehyde, sepg. the resin by filtration or sedimentation and purifying the water biologically after neutralising

Parmac, SorinSorinParmacBuliga, A.A.BuligaChiru, EpsicaEpsicaChiruDumitrescu, EmilEmilDumitrescuCostov, IoanIoanCostovCruceru, MihailMihailCruceruVarlam, C.C.VarlamPristavu, N.N.Pristavu2017-04-232017-04-231985-06-28Patent no. RO 86669-Ahttp://hdl.handle.net/123456789/895Patent Assignee Name(s) and Code(s): INST EPURAREA APELOResidual waters contg. organic substances, expressed as CCOOr 15000-50000 mg/l, are treated, at 40-80 deg.C, with 0.15-1 mol urea and 0.15-1 mol HCHO. The urea HCHO ratio is 1:1 to 1:2. The resin formed is sepd. by filtration or sedimentation. The treated water is neutralized at pH 0.2-0.5 and then purified biologically.en-USWastewater treatmentOrganic compoundsPurifying residual water contg. organic substances by adding urea and formaldehyde, sepg. the resin by filtration or sedimentation and purifying the water biologically after neutralisingProcedeu de epurare a apelor reziduale cu mare incarcare in substante organicePatent