Wastewater Treatment Case Study - SEAU Braila

Abstract

The paper analyses the influent and effluent parameters, as well as the efficiency of the purification process. CBO₅ is found to be within the legal limits in terms of the amount of effluent suspensions of max 6.0 mg/L O₂. The efficiency of their removal from the influent was at least 94.8%. CCO is observed within the legal limits of the amount of effluent suspensions of max 20.2 mg/L O₂. The efficiency of their removal from the influent was at least 93.0%. Suspended matter shows that the effluent sludge was within the legal limits of max 10.9 mg/L, and the efficiency of their removal from the influent was at least 91.6%. Total nitrogen (N_total) and total phosphorus (P_total) are exceedances of the limits for sensitive areas subject to eutrophication. A downstream denitrification step is proposed downstream of the aerobic stage to eliminate total nitrogen, and a phase of chemical treatment or alternation of aerobic and anoxic steps is proposed for the removal of total phosphorus.