Dinu, Laurentiu RazvanLaurentiu RazvanDinuDumitrescu, CiprianCiprianDumitrescuGhita, IleanaIleanaGhitaPatroescu, Viorel IonViorel IonPatroescuPena-Leonte, ElizaElizaPena-Leonte2017-04-192017-04-192009-10-30Patent no. RO122634­-B1http://hdl.handle.net/123456789/844Patent Assignee Name(s) and Code(s): ECOIND INST NAT CERC­ DEZVOLTARE ECOLOGIEThe invention relates to an anoxic­-anaerobic­-aerobic biological process for removing nitrates and phosphorus from residual waters, which uses pre­fermented primary mud hydrolysate as supplementary carbon source. According to the invention, the process consists in treating the residual water in an area of denitrification at a retention time of 7 h in the presence of pre­fermented mechanical mud, the reaction mixture flows gravitationally in an anaerobic reaction area where there is performed the dephosphorisation at a retention time of 2 h, where from it reaches the aerobic phase where there are performed the biodegradation and nitrification at a retention time of 7 h, at a mud concentration of 3 gds/l, afterwards the mixture is subjected to decantation there resulting removing efficiency of 86% for nitrates and 75% for total phosphorus.en-USNitrateRemovalWastewaterPatent