One of the most important quality properties which considered as treatment systems efficiency parameter, is organic matter effluent from treatment plant. The aim of present study is to comparison the efficiency of Wastewater Stabilization Ponds and conventional activated sludge systems in organic matter Removal from urban wastewaters according to Response Surface Method (RSM) and Central Composite Design (CCD). Present study was crosssectional and descriptive which conducted in 2015 and for determination of the efficiency of Wastewater Stabilization Ponds and conventional activated sludge systems. Experimental setup, model determination and organic matter removal equation and optimum level conducted using RSM and parameters including TSS, BOD5 and COD were evaluated. According to results, the optimum model for whole studied system was linear type. High correlation coefficient (R2) confirms the model. Lowest COD removal efficiency was associated to Stabilization pond by 60.78 percent. Minimum removal efficiency for BOD5 and TSS in conventional activated sludge were 59.6 and 43.51 percent, respectively. Whole experiments accuracy level was higher than 4. Results showed that RSM could appropriately interpret various system’s efficiency and their comparison.
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