ALEXANDRU WOINAROSCHY, CRISTINA SINGUREANU MUNICIPAL WASTEWATER TREATMENT, ECOLOGICAL COMPONENT OF STRATEGIC SYNERGY IN THE BLACK SEA BASIN The Black Sea is one of the world’s most polluted seas. Chemicals such as oil, fertilizers, insecticides and herbicides which do not decompose in the ground, enter the Black Sea, which becomes a huge repository for these collections mixed fertilizers and poisons. Domestic wastewater significantly contributes to pollution with organic matter and nutrients, and may be responsible for the spreading of diseases. A major component of the synergistic strategies for the environmental protection of the Black Sea consists the proper wastewater treatment. It is necessary to limit the amounts of nutrients such as ammonia, which may be discharged in treated effluents, to prevent excessive growths of algae and aquatic plants that can cause serious harm or even destroy the aesthetic value of water. In the frame of a case study, on the base of Bardenpho process, the simulation of remediation the increasing of ammonia concentration in municipal wastewater effluents was done using the SuperPro Designer v8.5 simulator. The reducing of ammonia concentrations in effluent was realized by modifications of several operating process parameters and the ammonia concentrations in effluent were decreased below the maximum legal admitted concentration. Also it was investigated the effect of the recirculated flow rate over the effluent ammonia concentration and over the total operating cost, which is a multiobjective optimization problem.