Removal of pesticide from wastewater: Contact time optimization for a two-stage batch stirred adsorber

Martino, M. Di; Sannino, Filomena; Pirozzi, Domenico

doi:10.1016/j.jece.2015.01.001

Cited by 12 publications

(9 citation statements)

References 29 publications

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“…Also, based on the results obtained from the quadratic model in Table 4, the R 2 value and Adj R 2 value were obtained as 0.986 and 0.973, respectively. These results showed that the predicted values obtained from the quadratic model is a fit of the experimental results (Martino et al 2015; Sarrai et al 2016; Dehghani et al 2017). …”

Section: Discussionmentioning

confidence: 66%

“…RSM contains various models such as the Behnken design, central composite design (CCD), factorials method, box-d-optimal design etc. (Martino et al 2015; Sarrai et al 2016; Dehghani et al 2017; Nama et al 2018). In the present study, according to the CCD model, the number of experiments was designed for variables such as diazinon concentration (1–40 mg/L), contact time (10–120 min), pH (3–12), and dose of nanoparticles (100–1000 mg/L), Table 2.…”

Section: Methodsmentioning

confidence: 99%

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Modeling photocatalytic degradation of diazinon from aqueous solutions and effluent toxicity risk assessment using Escherichia coli LMG 15862

et al. 2018

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In this study, modeling and degradation of diazinon from contaminated water by advanced oxidation process together with a new test for effluent bioassay using E. coli were investigated. The experiments were designed based on response surface methodology. Nanoparticles (NPs) were synthesized using the sol–gel method. The shape characteristics and specifications of elements in the nanoparticles were characterized using scanning electron microscope and energy dispersive X-ray, respectively. Diazinon was measured using high performance liquid chromatography device and by-products due to its decomposition were identified by gas chromatography-mass (GC–MS). In the present study, effluent bioassay tests were conducted by defining the rate of dehydrogenase enzyme reducing alamar blue method. According to statistical analyses (R2 = 0.986), the optimized values for pH, dose of NPs, and contact time were found to be 6.75, 775 mg/L, and 65 min, respectively. At these conditions, 96.06% of the diazinon was removed. Four main by-products, diazoxon, 7-methyl-3-octyne, 2-isopropyl-6-methyl-4pyrimidinol and diethyl phosphonate were detected. According to the alamar blue reducing (ABR) test, 50% effective concentration, no observed effect concentration, and 100% effective concentration (EC100) for the mortality rate of E. coli were obtained as 2.275, 0.839, and 4.430 mg/L, respectively. Based on the results obtained, it was found that mentioned process was high efficiency in removing diazinon, and also a significant relationship between toxicity assessment tests were obtained (P < 0.05).

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Section: Discussionmentioning

confidence: 66%

Section: Methodsmentioning

confidence: 99%

Modeling photocatalytic degradation of diazinon from aqueous solutions and effluent toxicity risk assessment using Escherichia coli LMG 15862

et al. 2018

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“…The overall removal percentage of metal ion onto the sorbent in two stages, R represents the sum of values of removal percentages obtained in each stage, R 1 and R 2 , is calculated by using the following equations: [4][5][6][7]14,19,20 ( ) ( )…”

Section: Design Of a Two-stage Batch Reactormentioning

confidence: 99%

“…In the design of a two-stage reactor, the optimization of contact time in the sorption process is a crucial parameter for practical application since a greater number of batch stages of wastewater can be conducted per day, which reduces the size of equipment and the capital cost. [2][3][4] The two-stage batch reactor for zinc and cadmium removal onto IMZ was designed by using equations (1)- (13). For that purpose, the parameters of q e and D i were calculated from the application of the Vermeulen's approximation and given in Table 1.…”

Section: Design Of a Two-stage Batch Reactormentioning

confidence: 99%

“…Therefore, in practical application, twostage batch reactors are usually applied. [1][2][3][4][5][6][7] In literature, two different design approaches to two-stage batch reactors can be found. The first approach is based on the application of the operating line method and the Henry law or the application of the operating line method and isotherms to equilibrium data of sorption onto sorbent in order to minimise the total amount of sorbent required to achieve a specific percentage of sorbent removal.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Removal Efficiency and Minimum Contact Time for Cadmium and Zinc Removal onto Iron-modified Zeolite in a Two-stage Batch Sorption Reactor

Ugrina

Medvidović

Trgo

et al. 2018

Chem.Biochem.Eng.Q.

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In highly congested industrial sites where significant volumes of effluents have to be treated in the minimum contact time, the application of a multi-stage batch reactor is suggested. To achieve better balance between capacity utilization and cost efficiency in design optimization, a two-stage batch reactor is usually the optimal solution. Thus, in this paper, a two-stage batch sorption design approach was applied to the experimental data of cadmium and zinc uptake onto iron-modified zeolite. The optimization approach involves the application of the Vermeulen's approximation model and mass balance equation to kinetic data. A design analysis method was developed to optimize the removal efficiency and minimum total contact time by combining the time required in the two-stages, in order to achieve the maximum percentage of cadmium and zinc removal using a fixed mass of zeolite. The benefits and limitations of the two-stage design approach have been investigated and discussed.

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Optimization of Adsorption Parameters for Removal of Carbaryl Insecticide Using Neem Bark Dust by Response Surface Methodology

Chattoraj

Mondal

Sadhukhan

et al. 2016

Water Conserv Sci Eng

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Adsorptive removal of carbaryl from aqueous solutions by neem bark dust (NBD) was investigated in a batch method under laboratory conditions. At first, the effects of particle size, stirring rate, and contact time on the adsorption process were studied. The optimum value of particle size, stirring rate, and contact time were 200 μm, 250 rpm, and 25 min, respectively. Subsequently, response surface methodology (RSM) was applied to investigate the effects of other operating parameters such as solution pH (2-10), adsorbent dose (0.01-1 g), and initial concentration (5-20 ppm). The optimization of the process parameters and calculation of the effects and interactions of process variables were done by using Box-Behnken design (BBD) which is a subset of RSM. The independent variables were precisely optimized by making use of an objective function called Bdesirability function.^Based on the adsorption capacity and economical use of adsorbent, the input parameters were optimized by setting two different sets of criteria (I and II). The desirability of two different sets were 1.00 and 0.822, respectively, which explains that the estimated function can well represent the experimental model. The optimized result revealed that the NBD can be an effective adsorbent for the removal of carbaryl from an aqueous system. The adsorption of carbaryl on NBD was best analyzed with the Langmuir isotherm and the pseudo-second order kinetic model. From the kinetic study, the maximum adsorption capacity was found to be 142.85 mg g −1 . Thermodynamic data confirmed the feasibility and spontaneous nature of the adsorption process.

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Removal of pesticide from wastewater: Contact time optimization for a two-stage batch stirred adsorber

Cited by 12 publications

References 29 publications

Modeling photocatalytic degradation of diazinon from aqueous solutions and effluent toxicity risk assessment using Escherichia coli LMG 15862

Modeling photocatalytic degradation of diazinon from aqueous solutions and effluent toxicity risk assessment using Escherichia coli LMG 15862

Optimization of Removal Efficiency and Minimum Contact Time for Cadmium and Zinc Removal onto Iron-modified Zeolite in a Two-stage Batch Sorption Reactor

Optimization of Adsorption Parameters for Removal of Carbaryl Insecticide Using Neem Bark Dust by Response Surface Methodology

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