Optimization of petroleum refinery effluent treatment in a UASB reactor using response surface methodology

Rastegar, Seyed Omid; Mousavi, Seyyed Mohammad; Shojaosadati, Seyed Abbas; Sheibani, S.

doi:10.1016/j.jhazmat.2011.09.052

Cited by 87 publications

(37 citation statements)

References 16 publications

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“…Another approach, consistent with oil-degrading micro-organisms at the sea floor (Wardlaw et al 2008), may involve anaerobic digestion of oil-contaminated sorbent under optimized conditions (Alimahmoodi and Mulligan 2011;Ji et al 2011;Mohan et al 2011;Rastegar et al 2011;Scherr et al 2012). Given the potential benefits of such approaches, considerably more research will be needed in the future to more fully understand the processes, including the quantification of decomposition rates and the identification of chemical breakdown products.…”

Section: Composting and Anaerobic Digestionmentioning

confidence: 99%

Cellulosic Substrates for Removal of Pollutants from Aqueous Systems: A Review. 3. Spilled Oil and Emulsified Organic Liquids

Hubbe

Rojas

Fingas³

et al. 2013

BioResources

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Section: Composting and Anaerobic Digestionmentioning

confidence: 99%

Cellulosic Substrates for Removal of Pollutants from Aqueous Systems: A Review. 3. Spilled Oil and Emulsified Organic Liquids

Hubbe

Rojas

Fingas³

et al. 2013

BioResources

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“…The effects of two-factor interactions were investigated with one factor fixed at a high (+1) or low (−1) level while the other was varied (Gong et al 2010;Rastegar et al 2011). Figure SM-2 shows interaction plots, which indicate whether or not there was an interaction between the factors.…”

Section: Response Surface Evaluationmentioning

confidence: 99%

Selective oxidative degradation of toluene for the recovery of surfactant by an electro/Fe2+/persulfate process

Long

Zhang

2015

Environ Sci Pollut Res

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An electro/Fe(2+)/persulfate process has been conducted for toluene removal from surfactant (SDS) flushing solution, and the pseudo-second-order reaction rate constant (k2 value) of toluene removal has been optimized by a response surface methodology (RSM). The results indicated that in this process, the reaction between persulfate and externally added Fe(2+) generates sulfate-free radicals, and at the same time, Fe(2+) is electro-regenerated at the cathode by the reduction of Fe(3+). RSM based on Box-Behnken design (BBD) has been applied to analyze the experimental variables, of which the concentrations of persulfate and Fe(2+) showed a positive effect on the rate constant of toluene removal, whereas the concentration of SDS showed a negative effect. The interactions between pairs of variables proved to be significant, such as between SDS, persulfate, and Fe(2+) concentrations. ANOVA results confirmed that the proposed models were accurate and reliable for analysis of the variables of the electro/Fe(2+)/persulfate process. The shapes of the 3D response surfaces and contour plots showed that the SDS, persulfate, and Fe(2+) concentrations substantially affected the k2 value of toluene removal. The results indicated that increasing persulfate or Fe(2+) concentration increased the k2 value, whereas increasing SDS concentration decreased the k2 value. The reaction intermediates have been identified by GC-MS, and a plausible degradation pathway for toluene degradation is proposed.

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“…where, y is the response, b 0 is the constant coefficient, X i (i = 1 -n) are non-coded variables, b i are the linear interaction coefficients, b ii are the quadratic interaction coefficients, b ij (i and j = 1 -n) are the second-order interaction coefficients, and e are residuals for each experiment (Rastegar et al 2011). Design-Expert 7.0 program (Version 7.0, Stat-Ease Inc., Minneapolis, MN, USA) was used for data processing with Eq.…”

Section: Experimental Designmentioning

confidence: 99%

Eudragit RS PO nanoparticles for sustained release of pyridostigmine bromide

et al. 2013

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Pyridostigmine bromide (PB) is an inhibitor of cholinesterase, which is used in the treatment of myasthenia gravis and administered for protection against exposure to toxic nerve agents. Tests were done to investigate prolonging the half-life of PB and improving its release behavior. PB was loaded in nanoparticles (NPs) of Eudragit RS PO (Eu-RS) prepared using the technique of quasi emulsion solvent diffusion. Variables of output power of the sonicator, bath temperature and mixing time, were chosen as the optimization factors to obtain the minimum sized NPs. In addition, emulsions were tested at different ratios of drug-to-polymer by dynamic light scattering to determine size and zeta potential of NPs. UV-spectroscopy was used to determine PB content of the NPs. Drug-loaded NPs were characterized by scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectra. Results determined that mixing time had a significant impact on the size of Eu-RS NPs, but power output of sonicator and bath temperature had no significant effect. The particle size obtained at the optimum condition (power output of 70 W, bath temperature of 33°C, and mixing time of 7 min) was less than 200 nm (optimum sizes were 138.9 and 179.5 nm for Eu-RS and PB-loaded Eu-RS NPs, respectively). The optimum PB-loaded Eu-RS NPs at the PB to Eu-RS weight ratio of 1-4 and 20 % of loaded PB released from the nanocarriers within 100 h.

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Optimization of petroleum refinery effluent treatment in a UASB reactor using response surface methodology

Cited by 87 publications

References 16 publications

Cellulosic Substrates for Removal of Pollutants from Aqueous Systems: A Review. 3. Spilled Oil and Emulsified Organic Liquids

Cellulosic Substrates for Removal of Pollutants from Aqueous Systems: A Review. 3. Spilled Oil and Emulsified Organic Liquids

Selective oxidative degradation of toluene for the recovery of surfactant by an electro/Fe2+/persulfate process

Eudragit RS PO nanoparticles for sustained release of pyridostigmine bromide

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