Abstract
The aim of this study is to enhance effluent quality and improve sludge settleability by determining the effect of mixed liquor suspended solids (MLSS) on settling behaviour and the efficiency of treatment in an aerobic-anoxic sequencing batch reactor (AASBR). The results revealed that raising the concentrations of MLSS from 2 to 3 g/l improved the efficiency of removing the chemical oxygen demand (COD), ammonia-nitrogen (NH3-N) and nitrate-nitrogen NO3-N leading to an increase in the sludge volume index (SVI) value. Increasing the concentration of MLSS from 3 to 4 g/l did not significantly affect the removal rates of COD, NH3-N and NO3-N nor the solid’s settling behaviour. However, increasing the concentration of MLSS from 4 to 6 g/l, significantly reduced the efficiency of COD and nitrate removal, the sludge settling rate slowing down in consequence. These results prove that the optimal concentration of MLSS for COD, NH3-N and NO3-N removal is between 3 and 4 g/l. In this range, the removal rates for COD, NH3-N and NO3-N were 93%, 95% and 96% respectively, the effluent quality 35 mg/l, 0.43 mg/l and 0.75 mg/l for COD, NH3-N and NO3-N, respectively. A good solid separation occurred during that range with an SVI value of 81 ml/g. This finding was supported by a morphological study in parallel with scanning electron microscopy (SEM).
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