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      저자 : Ramdhane Dhib (검색결과 2 건)
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        Experimental study of degradation and biodegradability of oxytetracycline antibiotic in aqueous solution using Fenton process

        Mustapha Zouanti,Mohamed Bezzina,Ramdhane Dhib 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.3

        The degradation of aqueous oxytetracycline (OTC) from an aqueous solution antibiotic using H₂O₂/Fe<SUP>2+</SUP> process was studied in one 1 L batch chemical reactor. The extent of OTC degradation (20 mg/L) was investigated from a known initial pH solution, temperature and the type of catalyst (Fe<SUP>2+</SUP>, Fe<SUP>3+</SUP>) and for various initial concentrations of OTC, H₂O₂ and Fe<SUP>2+</SUP>. The degradation efficiency achieved was found to be very important (90.82% and 90.63%) at initial pH solution of 3 and 4, respectively. However, the type of catalyst and the reaction temperature had a slight impact on the final degradation of OTC. The results showed that the OTC removal increased with increasing initial H₂O₂ concentration in the range of 70 to 150 mg/L and initial Fe<SUP>2+</SUP> concentrations in the range of 2 to 5 mg/L. The highest degradation efficiency obtained at ambient temperature was 90.95% with initial concentration of OTC of 10 mg/L, H₂O₂ = 150 mg/L and Fe<SUP>2+</SUP> = 5 mg/L. Moreover, biodegradability improved from 0.04 to 0.36 and chemical oxygen demand degradation was 78.35% after 60 min of treatment. This study proved that Fenton process can be used for pretreatment of wastewater contaminated by OTC before a biological treatment.

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        Nonlinear MPC of a multi-zone multi-feed LDPE autoclave reactor

        Noel C. Jacob,Ramdhane Dhib 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.5

        This paper discusses the design of a model-based multivariable nonlinear model predictive control (NMPC) formulation for the control of a multi-zone multi-feed LDPE autoclave reactor. Unscented Kalman filtering (UKF) state estimation was employed for online estimation of the plant states and disturbances. In addition to structural plant-model mismatch and noisy process measurements, the closed-loop performance of the UKF based NMPC scheme was investigated under parametric uncertainty in the kinetic rate constants. The closed-loop NMPC performance was also assessed for polymer grade changes, and for disturbance rejection at both open-loop stable and unstable operating regions.

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