Valorisation d’un sous-produit de l’industrie sucrière : mise en œuvre dans un procédé de traitement d’eaux usées industrielles

Reddad, Z.; Gerente, C.; Andres, Y.; Cloirec, P. Le

doi:10.4267/dechets-sciences-techniques.1966

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…Above a concentration of 0.04 M NaCl, there is always a decrease but at a very low rate. This phenomenon can be attributed to the fact that Na + ions accumulate in greater numbers next to the surface and thus screen the fixation sites [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

The Use of Sugarcane Bagasse to Remove the Organic Dyes from Wastewater

Kerrou

Bouslamti

Raada

et al. 2021

International Journal of Analytical Chemistry

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In the present study, the potential of sugarcane bagasse (SCB) was evaluated by methylene blue (MB) retention. The selected low-cost adsorbent was characterized by scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR), BET method, and determination of the point of zero charge (pHzpc). Batch kinetic and isothermal studies were performed to examine the effects of contact time, initial dye concentration, adsorbent dose, pH, and temperature. The results show that the kinetic study of MB adsorption on sugarcane bagasse is very fast; the equilibrium is reached after only 20 minutes. The kinetic model of pseudo-second-order and the Langmuir isotherm model perfectly explain the adsorption process of MB with a monolayer adsorption capacity equal to 49.261 mg·g−1 activation parameters’ values such as free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°) also determined as −4.35 kJ·mol−1, −31.062 kJ·mol−1, and −0.084 J·mol−1·K−1, respectively. Besides, the thermodynamic parameters of the methylene blue sugarcane bagasse system indicate that the exothermic adsorption process is spontaneous.

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Section: Resultsmentioning

confidence: 99%

The Use of Sugarcane Bagasse to Remove the Organic Dyes from Wastewater

Kerrou

Bouslamti

Raada

et al. 2021

International Journal of Analytical Chemistry

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A research into sorption properties of peat briquettes used to remove ions of cadmium, lead and copper from wastewaters

2020

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Introduction. At present, the following areas are the subject of intensive research: methods for removing such toxic metals as cadmium, lead, copper, etc. from wastewaters, namely, using new composite sorbents for this purpose; improvement of ion exchange treatment and, for example, sedimentation of sulphides or oxalates; wood ash sorption; biosorption onto plants. It is a future-oriented trend to use peat as a sorbent in a wastewater treatment technology. Extensive peat deposits in the Republic of Belarus can contribute to production of cheap, environmentally friendly sorbents made of modified peat briquettes. The mission of this work is to study the sorption properties of peat briquettes used to remove cadmium, lead and copper ions from wastewater. Materials and methods. Physicochemical, technological, mathematical methods are employed. Results. The co-authors studied the kinetics of cadmium Cd+2, lead Pb+2, and copper Cu+2 ions sorption onto peat briquettes. They identified that the bigger the grain of peat briquettes, the less efficient the sorption. The sorption process is intensive: it takes cadmium Cd+2, lead Pb+2, and copper Cu+2 ions five minutes to get extracted from the solution; extraction efficiency reaches 91.11; 96.96 and 88.39 %, respectively. 20 minutes is enough to reach degree of equilibrium F = 0.98 for cadmium Cd+2 and lead Pb+2 and F = 0.96 for copper Cu+2. F is equal to 0.99 for all ions in 40 minutes. The multiplicity of extraction, or the ratio of initial concentration to equilibrium concentration reaches 114 for cadmium ions Cd+2, 162 for lead ions Pb+2, and 93 for copper ions Cu+2. In case of saturation, sorption capacity reaches the following values: Сd+2 — 0,0778 mmol/g (8.75 mg/g), Pb+2 — 0.8205 mmol/g (170.00 mg/g), Cu+2 — 2.707 mmol/g (172 mg/g). The co-authors used equations of diffusion and chemical kinetics to establish that the sorption process proceeds in the diffusion mode, and the stage of chemical interaction of metal ions with functional groups of peat contributes to the overall velocity of the process. Conclusions. Peat briquettes represent an effective sorbent used to remove cadmium Cd+2, lead Pb+2, and copper Cu+2 ions from wastewater. The sorption process is almost over in 20 minutes.

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Valorisation d’un sous-produit de l’industrie sucrière : mise en œuvre dans un procédé de traitement d’eaux usées industrielles

Abstract: Valorisation d'un sous-produit de l'industrie sucrière Figure 7 : Courbes de percée expérimentales et modélisées obtenues avec Pb 2+ (C 0 = 0,491 mmol.L-1) et Cd 2+ (C 0 = 0,427 mmol.L-1) pour une concentration en pulpes de 10 g.L-1

Cited by 2 publications

References 5 publications

The Use of Sugarcane Bagasse to Remove the Organic Dyes from Wastewater

The Use of Sugarcane Bagasse to Remove the Organic Dyes from Wastewater

A research into sorption properties of peat briquettes used to remove ions of cadmium, lead and copper from wastewaters

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