The approach incorporated Eulerian multiphase model, porous medium scheme, and also successfully took into account the vertically dependent filtration flux and the effect of mixed liquor suspended solids (MLSS) on mixed liquor viscosity.
COD, NH4+-N, NO2−-N, NO3−-N, PO43−-P, mixed liquor suspended solids (MLSS), and mixed liquor volatile suspended solids (MLVSS) were analyzed according to the Standard Method [ 16].
CODCr, NH4+-N, nitrite (NO2−-N), nitrate (NO3−-N), sludge volume index with 30 min settling time (SVI30), mixed liquor suspended solids (MLSS) and mixed liquor volatile suspended solids (MLVSS) were analyzed in accordance to the Standard Methods [ 20].
Mixed liquor suspended solids (MLSS) and Mixed liquor volatile suspended solids (MLVSS) were measured by gravimetric method at temperature of 103 105°C and 550 ± 50°C in muffle furnace, respectively.
It was found that specific surface area of bubbles, aeration intensity, and diffuser submerged depth had positive effect on the oxygen transfer coefficient (kLa), while some mixed liquor characteristics such as the mixed liquor suspended solids (MLSS) concentration and apparent viscosity exerted negative function on it.
Mixed liquor suspended solids (MLSS): the suspended solid concentration in the mixed liquor.
Filtration performance proved to depend on the concentration of mixed liquor suspended solids (MLSS).
The effects of three independent variables, i.e. hydraulic retention time (HRT), aeration mode and mixed liquor suspended solid (MLSS) concentration on 10 process responses were investigated.
Series of extended short term filtration experiments were performed at varying operating conditions of mixed liquor suspended solids (MLSS) concentrations, trans-membrane pressures (TMP) and mesh pore sizes.
Stable mixed liquor suspended solid concentration (3.0 5.0 g/L); enhanced nitrification denitrification activity (78 92%) and reduced transmembrane pressure were also achieved.
