Mathematical modelling of 4-chlorophenol inhibition on COD and 4-chlorophenol removals in an activated sludge unit

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• 作者：Isil Konya ; Serkan Eker ; Fikret Kargi
• 关键词：Activated sludge ; 4-Chlorophenol (4-CP) ; Mathematical model
• 刊名：Journal of Hazardous Materials
• 出版年：2007
• 出版时间：8 May 2007
• 年：2007
• 卷：143
• 期：1-2
• 页码：233-239
• 全文大小：222 K

文摘

A mathematical model was developed for an activated sludge unit treating 4-chlorophenol (4-CP) containing synthetic wastewater composed of diluted molasses, urea, KH₂PO₄ and MgSO₄ with COD and 4-CP contents of 2500 and 500 mg l⁻¹, respectively. The model included 4-CP inhibition on COD and 4-CP removals. Experimental data obtained at different hydraulic residence times (HRT = 5–30 h) and sludge ages (SRT, 3–30 days) were used to estimate the kinetic and inhibition constants for COD and 4-CP removal rates. 4-CP inhibition on COD removal was negligible while the inhibition on 4-CP removal was significant. The specific rate constant (k), saturation constant (K_s) for COD oxidation were found to be 2.64 day⁻¹ and 559 mg l⁻¹, respectively. A similar model was used for 4-CP oxidation in the activated sludge unit and the constants were found to be k′ = 1.44 day⁻¹, 71420014cf947303447ec3bf"" title=""Click to view the MathML source"">K^′_s=25.7 mg l⁻¹, K^′_CP=559 mg l⁻¹ and K_I,CP = 17 mg l⁻¹. Increases in death rate constant because of 4-CP inhibition was also quantified and the inhibition constants were determined for both COD and 4-CP removals. Model predictions with the estimated kinetic constants were in good agreement with the experimental data. Developed model can be used to estimate the performance of an activated sludge unit treating 4-CP containing wastewater under the specified experimental conditions.