Global attention is increasingly focused on the adverse health and environmental impacts of textile dyes, marking the necessity for effective and sustainable dye remediation strategies in industrial wastewater. This study introduces a novel, eco-friendly activated carbon produced from olive stones (OLS), a readily available by-product of the olive oil industry. The OLS was chemically activated with H3PO4 and KOH, creating two materials: OLS-P and OLS-K, respectively. These were then utilized as cost-effective adsorbents for the removal of methylene blue (MB) dye. The activated materials were characterized via X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FTIR), iodine number, and pHpzc analysis, with the zero-point charge determined as approximately pH 1 for OLS-P and pH 8 for OLS-K. Batch adsorption experiments conducted at various temperatures revealed that adsorption process followed the pseudo-second-order kinetic model and the Langmuir isotherm model. Temperature was found to significantly impact adsorption performance, with OLS-K demonstrating a substantial increase in adsorption capacity (qe) from 6.27 mg/g at 23˚C to 94.7 mg/g at 32 ˚C. Conversely, OLS-P displayed a decrease in qe from 16.78 mg/g at 23 ˚C to 3.67 mg/g at 32 ˚C as temperature increased. The study highlights the potential of KOH-treated olive stones as a promising, cost-efficient adsorbent for methylene blue remediation from wastewater.
NaOH Treated Eggshells (TES) was investigated for the removal of Acide Orange 7 (AO7) from aqueous solution using the continuous method was modeled by response surface methodology (RSM) and was optimized using Box–Behnken design (BBD) . Fixed bed adsorption has become a frequently used in wastewater treatment processes. Various low cost adsorbents have been studied for their applicability in treatment of different types of effluents. In this work, the intention of the study was to explore the efficacy and feasibility for azo dye, AO7 adsorption onto fixed bed column of TES. The effect of operating parameters such as flow rate, initial dye concentration, and bed height were exploited in this study. The studies confirmed that the breakthrough curves were dependent on flow rate, initial dye concentration solution of AO7 and bed depth.The precision of the equation obtained by Box–Behnken design (BBD) utility for modeling and optimization by response surface methodology RSM was confirmed by the analysis of variance (ANOVA) and calculation of correlation coefficient relating the predicted and the experimental values of removal of dye. The results revealed a good agreement between the predicted values, as obtained by the model, and the experimental values for AO7. The optimum conditions proposed by Box–Behnken design (BBD) to reach the maximum dye removal through adsorption process. Under the optimum conditions, the removal efficiency of AO7 were 89.89%.The application of response surface methodology in order to optimize using Box–Behnken design (BBD) . The research on modeling adsorption by RSM has been highly developed and The TES was shown to be suitable adsorbent for adsorption of AO7 using fixed-bed adsorption column.
In this work, olive mill wastewater (OMW) such as dyes is very toxic even present as traces in industrial wastewater effluents. It may constitute a potential pollution source of ground waters and hence it has to be eliminated. Various low cost adsorbents have been studied for their applicability in treatment of different types of effluents. In this study, the potential of activated carbon derived from Olive Stones was studied for the removal of OMW. The biosorption of OMW from aqueous solutions by Olive Stones (OLS) as a low-cost, natural and eco-friendly biosorbent was investigated and by KOH and H3PO4 treated Olive Stones (AOLS). Biosorption kinetic data were properly fitted with the pseudo-second-order kinetic model. The experimental isotherm data were analyzed using Langmuir, Freundlich isotherm equations. The best fit was obtained by the Langmuir model with a Langmuir maximum monolayer biosorption capacity of 189,83 mg/g for OMW. The biosorption was exothermic in nature (H° = -105,54 kJ/mol). The reaction was accompanied by a decrease in entropy. The Gibbs energy (G°) increased when the temperature was increased from 303 to 320 °K indicating a decrease in feasibility of biosorption at higher temperatures. The results have established good potentiality for the Olive Stones to be used as a sorbent for the removal of olive mill wastewater.
Olives mill waste water resulting from the extraction of olive oil are the major problem of olive growing because of their polluting power (rich in organic and mineral matter) and their acid pH. The aim of this study is to treat these margins electrochemically in an aluminum electrode reactor, in order to oxidize the organic matter, discolour the margins, neutralize the pH and consequently reduce the pollutant power of this product. After this study, it was found that the increase in electrolysis time and the intensity of the current significantly improved the treatment. However, simultaneous energy consumption and electrodes were observed. The results of these analyzes showed that thirty-fold diluted margins are effluents at acid pH (5.02), Conductivity (14.89).The evolution of the physicochemical parameters during the electrocoagulation (EC) treatment shows that under the conditions of an electrolysis time of 3 h and a current intensity of 3A (corresponds to 416 A.m -2 ), the discoloration Of the margins diluted ten times is between 91%, the reduction of the lost mass of the electrodes is 0.55 kg.m -3 and the reduction of the COD is 50%. These optimal operational levels allow a good degradation of the effects of margins. The results have established good potentiality for the electrocoagulation to be used as a method for the removal of phenol from wastewater.
Olive mill wastewater (OMW) is the major problem from olive oil extraction, due to its polluting organic and mineral matter and acid pH.This study aims to electrochemically treat OMW in an Al electrode reactor, to oxidize the organic matter, discolor the margins and neutralize the pH, thus reducing the pollutants.Various low cost adsorbents have been studied for the treatment of different types of effluents.In this study, the potential of activated carbon (C) derived from olive stones (OS) was studied for OMW removal.H3PO4 (phosphoric acid) treated OS (AOS), as a low-cost, natural and eco-friendly biosorbent, was investigated for OMW removal from aqueous solutions.This work found that the increase in electrolysis time and current intensity significantly improved the treatment, while energy consumption and electrodes were observed.The results showed thirty-fold diluted margins for effluents with an acid pH of 5.02 and a conductivity of 14.89.The physicochemical parameters evolution during the electrocoagulation (EC) treatment showed that, under the conditions of an electrolysis time of 3 h and a current intensity of 3 A (= 416 A/m -2 ), the margins discoloration diluted ten times (91%), the mass loss of the electrodes was 0.55 kg.m -3 and the chemical oxygen demand (COD) reduction was 50%.These optimal operational levels allowed a good degradation of the margins.Biosorption kinetic data were properly fitted with the pseudo-second-order kinetic model.The experimental isotherm data were analyzed using Langmuir's and Freundlich's isotherms equations.The best fit was obtained by the Langmuir's model, with maximum OWM monolayer biosorption capacity of 189.83 mg/g.The biosorption was exothermic in nature (entalphy change: H° = -13.11kJ/mol).The reaction was accompanied by a decrease in entropy (S° = -72.91kJ/mol).The Gibbs energy (G°) was higher when the temperature was increased from 303 to 318 K, indicating a decrease in the biosorption feasibility at higher temperatures.The results have established good potentiality for EC and ALS to be used for OMW removal.
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