Brasov WWTP-biological treatment modeling, Brasov County, Romania
Brasov wastewater treatment plant (Brasov county, Romania), designed to treat a dry weather maximum daily flowrate of 205.805 m3/day (500.000 PE), is an existing treatment facility that encountered difficulties in achieving its treatment goals.
Due to recent wastewater quality changes, the biological treatment has started to unsuccessfully remove nutrients such as nitrogen and phosphorus.
At this point, the Operator sought professional expertise to assess the required modifications the biological treatment needs to undergo to lower the effluent’s N and P concentrations to the compliance limits (NH4-N: 1,55 mg/L; NO3-N: 5,65 mg/L, NO2-N: 0,30 mg/L; TP: 1,0 mg/L).
The modelled process was a 3-stage Modified Bardenpho (A20 – Anaerobic, Anoxic, Oxic) treatment scheme that incorporated the already well established EPBR (Enhanced Phosphorus Biological Removal) for biological phosphorus removal and pre-denitrification for biological nitrogen removal.
The proposed model is based on the ASM2d Model (Activated Sludge Model 2d) of the IWA (International Water Association) for basic biological removal of carbon, nitrogen, and phosphorus, UCTADM1 Model (UCT Anaerobic Digestion Model) for anerobic fermentation process and Musvot model for the inorganic components precipitation.