- مبلغ: ۸۶,۰۰۰ تومان
- مبلغ: ۹۱,۰۰۰ تومان
Organic loading (weight per unit time per volume) is useful for the design of rotating biological contactors (RBC). The present study emphazes the significance of this control or design parameter, because it allows for the direct comparison of the RBC system‘s performance when operated under various circumstances and with different kinds of wastewater. The results of the paper prove that the COD removal in rotating biological contactor systems is a function of the organic loading rate. However, both the wastewater concentration and flow rate also influence the system’s efficiency, but their impact can be combined by the effects of organic loading. Most of the removal of the COD (40-85 % of the total removal, depending on the organic loading applied) occurs in the first stages of the system. There is a strong correlation between the organic loading and the concentration of suspended solids in the rotating biological contactor basin. At higher loadings higher concentrations are noted. At a loading of about (24 g/m2.d), the suspended solids were 225, 125, 35, and 25 mg/L in the first, second, third and fourth stages respectively. To achieve an effluent quality of (BOD < 25 mg/L, COD < 60 mg/L), the system must be operated at organic loadings of about (22 gBOD/m2.d and 65 gCOD/m2.d) respectively. For the nitrification process, the system must be designed to operate at an organic loading of about (10 g/m2.d) or less, and the reactor or basin volume should be designed to achieve a hydraulic loading of about (40 L/m2.d) or less.