The comparison of photooxidation processes for the minimization of organic load of colored wastewater applying the response surface methodology

Kušić, Hrvoje; Jovic, Martina; Kos, Nataša; Koprivanac, Natalija; Marin, Vedrana

doi:10.1016/j.jhazmat.2010.07.011

Cited by 26 publications

(30 citation statements)

References 30 publications

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“…Hence, taking into account the DoE matrix given in Table 2 and obtained apparent kinetic rates, RSM models in a form of quadratic polynomials were derived for each studied PS-P and used oxidant type (Table 3). In the spirit of good practice in such statistical/empirical modeling [22,25,28], we evaluated the derived RSM models for their significance and accuracy using standard statistical tools such as analysis of variance (ANOVA; including F, t, p, R 2 , R adj 2 , R pre 2 values) and residual diagnostic (RD; including normal probability test, Levene's test, and constant variance test). According to the results (Table 3), 0.942 < R 2 < 0.999 and 0.0002 < p < 0.0456, it can be concluded that all derived RSM models are accurate and significant, thus can be used hereinafter as a tool to enlighten the influence of key process parameters of applied UV-C/H 2 O 2 and UV-C/S 2 O 8 2-treatments on degradation kinetics of on studied PS-Ps.…”

Section: Resultsmentioning

confidence: 99%

“…Persulfate, commonly available in a salt form (with K + , Na + and NH 4 + cations) is characterized as a stable, high soluble at the ambient temperature and relatively harmless and environmentally friendly. Accordingly, SO 4 • -is increasingly discussed as an oxidizing agent for degradation of pollutants in water [17][18][19][20][21][22][23][24][25]. Due to its strong electron acceptor ability, SO 4 • -enables the degradation of recalcitrant compounds which are refractory towards HO•.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Photooxidative Degradation of Pesticides in Water; Response Surface Modeling Approach

Cvetnić

Ukić

Kušić

et al. 2017

Journal of Advanced Oxidation Technologies

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Abstract:The conventional water treatment technologies, mostly relying on physical and biological processes, seem to be inadequate for effective removal of priority substances such as pesticides, while advanced oxidation processes showed a good performance for the same purpose. The aim of the study was to evaluate UV-C/H 2 O 2 and UV-C/S 2 O 8 2-processes for treating seven pesticides listed as priority substances (PS-Ps) within the EU Water Framework directive; alachlor, atrazine, chlorfenvinphos, cybutryne, diuron, isoproturon and simazine. The influence of pH and pollutant/oxidant ratio ([PS-P]:[OX]) on the degradation kinetics was evaluated using full factorial plan and response surface modeling. The degradation of PS-Ps by both photooxidation processes obeyed first-order kinetics. Degradation kinetics of PS-Ps is highly depended on [PS-P]: [OX], while pH has minor significance, particularly in UV-C /S 2 O 8 2-process. In most cases degradation kinetics by UV-C /S 2 O 8 2-was several times faster in comparison to UV-C /H 2 O 2 process. In addition, the inhibitory influence of NOM on the degradation of PSs in the mixture was determined.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photooxidative Degradation of Pesticides in Water; Response Surface Modeling Approach

Cvetnić

Ukić

Kušić

et al. 2017

Journal of Advanced Oxidation Technologies

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“…The important information on the model performance is summarized in residuals (i.e., difference between observed and predicted values) providing a clear view for any discrepancy in fit to the model. Hence, two plots related to residuals: the normal probability plot of residuals and the plot of internally studentized residuals versus predicted values are considered as additional tests of model adequacy checking tools 23 . A check on the normal probability plots in Figure 2a and Figure 3a show that points or point clusters are placed closely to the diagonal line implying that the errors are distributed normally for both responses.…”

Section: Drug Release Kineticsmentioning

confidence: 99%

Untitled

2014

IJPSR

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ABSTRACT:Furosemide is a potent and commonly used loop diuretic. It is absorbed largely in the stomach and upper small intestine. This narrow absorption window results in its low (average of 50%) and variable (10-100%) bioavailability from conventional dosage forms. The objective of the present study was to develop an optimized controlled release floating microspheres of furosemide capable of floating on the gastric fluid and delivering the drug over a period of 12 h. The floating microspheres were prepared by solvent evaporation method. Preliminary studies were conducted and, drug loading and EC/HPMC ratio were identified as the most important factors affecting the desired response variables: drug release rate and buoyancy. The effects of drug loading and EC/HPMC ratio were further studied and optimized. Simultaneous optimization of buoyancy and release rate was performed using central composite design and the most desirable optimal point was obtained at release rate of 27 h -1/2 and buoyancy of 58.45%, with corresponding levels of 344 mg furosemide and 4.84 EC/HPMC ratio. Evaluation of the optimized formulation showed high yield, good flow property, extended release and buoyancy over a period of 12 h and excellent drug entrapment efficiency. Comparison of the release profiles of the three different batches of the optimized formulation confirmed that there was no statistically significant difference (p = 0.302) in the release profiles of the formulations.

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“…Also, the performance of the RSM on the 'pseudo'-second order rate constant was studied in order to indirectly introduce another parameter (treatment time) in the experimental design. [40] In order to compare the reaction rates, the reaction order has to be determined and then the rate constant could be easily calculated and compared through the linear regression if all of them could be fitted to the same reaction order. [41] Therefore, several functional dependences of the TOC concentration on time representing different integral order of reactions (zero, first and second) were examined.…”

Section: Rsm Model Developmentmentioning

confidence: 99%

Optimisation of photo‐Fenton‐like degradation of aqueous polyacrylic acid using Box‐Behnken experimental design

2013

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The effectiveness of photo-Fenton-like process to degrade aqueous polyacrylic acid (PAA) is investigated in a batch recirculation system using two photoreactors in series. The response surface methodology (RSM) using the Box-Behnken experimental design combined with quadratic programming is employed for the experimental design, the statistical analysis and the optimisation. The effects of the initial concentration of PAA, the initial concentration of H 2 O 2 :Fe 3þ , pH and the recirculation rate on the percent removal of total organic carbon (TOC)and the 'pseudo'-second order rate constant as the process responses are studied. The statistical analysis of the results indicates a satisfactory prediction of the system behaviour by the developed quadratic models. Optimum operating conditions to maximise the percent TOC removal are also determined.

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The comparison of photooxidation processes for the minimization of organic load of colored wastewater applying the response surface methodology

Cited by 26 publications

References 30 publications

Photooxidative Degradation of Pesticides in Water; Response Surface Modeling Approach

Photooxidative Degradation of Pesticides in Water; Response Surface Modeling Approach

Untitled

Optimisation of photo‐Fenton‐like degradation of aqueous polyacrylic acid using Box‐Behnken experimental design

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