期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 49, 期 4, 页码 1873-1880出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf001223b
关键词
Fenton's reagent; olive oil mill wastewater; kinetics; iron; hydrogen peroxide; environmental remediation
Wastewater from olive oil mills has been treated by means of the Fe(II)/H2O2 system (Fenton's reagent). Typical operating variables such as reagent concentration (C-H2O2 = 1.0-0.2 M; C-Fe(II) = 0.01-0.1 M) and temperature (T = 293-323 K) exerted a positive influence on the chemical oxygen demand and total carbon removal. The optimum working pH was found to be in the range 2.5-3.0. The exothermic nature of the process involved a significant increase of the temperature of the reaction media. The process was well simulated by a semiempirical reaction mechanism based on the classic Fenton chemistry. From the model, the reaction between ferric iron and hydrogen peroxide [h = 1.8 x 10(15) exp((-12577 +/- 1248)/T)] was suggested to be the controlling step of the system. Also, the simultaneous inefficient decomposition of hydrogen peroxide [k = 6.3 x 10(12) exp((-11987 +/- 2414)/T)] into water and oxygen was believed to play an important role in the process. On the basis of stoichiometric calculations for hydrogen peroxide consumption, an estimation of the process economy has been completed.
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