Biosorption of Malachite Green from aqueous solutions onto aerobic granules: Kinetic and equilibrium studies

Sun, Xiaohua; Wang, Shuguang; Liu, Xianwei; Gong, Wen-Xin; Bao, Nan; Gao, Baoyu; Zhang, Huayong

doi:10.1016/j.biortech.2007.07.055

Cited by 149 publications

(71 citation statements)

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“…Some processes of biosorption of cationic dyes that are reported in the literature fit this model and are similar to those obtained in this work (Sun et al, 2008, Chowdhury et al, 2011, and Kumar & Ahmad 2011.…”

Section: Universitas Scientiarum Vol 21 (3): 259-285supporting

confidence: 87%

“…Given that both the MG and the CV are cationic dyes, increased adsorption was due to increasing pH because the negative charges of biomass should attract positive charges in the dye (Cheng et al, 2008, Sun et al, 2008. However, the results obtained showed that it is possible to obtain greater adsorption at lower pH which is supported by the interaction of three factors.…”

Section: Universitas Scientiarum Vol 21 (3): 259-285mentioning

confidence: 91%

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Partial removal and detoxification of Malachite Green and Crystal Violet from laboratory artificially contaminated water by Pleurotus ostreatus

et al. 2016

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The triphenylmethane Malachite Green (MG) and Crystal Violet (CV) dyes are cationic dyes and mix with domestic wastewater when dumped; increasing, among others, the chemical and biological oxygen demand and can cause acute toxicity at different trophic levels. Promoting the removal (decolorization) of MG and CV, and laccase activity (54.8 ± 8.9 and 30.6 ± 2.9 UL -1 respectively) by using P. ostreatus viable biomass needed parameters such as pH (4.5 and 6.0), temperature ). In adsorption studies, it was showed that an acidic pH favors the adsorption of both dyes and the model of pseudo-second order describes best the phenomenon of adsorption. Finally, the germination index (GI), using Lactuca sativa seeds for the initial dyes solutions, was < 50%; demonstrating its high phytotoxic effect. When dye solutions were treated with viable biomass, the GI increased, leaving open the possibility to perform future research to determine if the aqueous solutions, post-treated with P. ostreatus, could be used in treatments that generate less toxic water which could be used in processes that do not require potable water.

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Section: Universitas Scientiarum Vol 21 (3): 259-285supporting

confidence: 87%

Section: Universitas Scientiarum Vol 21 (3): 259-285mentioning

confidence: 91%

Partial removal and detoxification of Malachite Green and Crystal Violet from laboratory artificially contaminated water by Pleurotus ostreatus

et al. 2016

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“…Moreover, the granulation process takes place without reliance on surfaces for biofilm growth, which makes artificial carriers unnecessary. Developed in the last decade (29), an impressive number of studies have been performed to explore the potentials of the AGS technology in the treatment of high-strength organic wastewaters (10,45,61), toxic aromatic pollutants (32,35,73), heavy metals (38,70,71), and textile dyes (62). Additionally, AGS has been extensively applied for nutrient removal (19,20,43,55).…”

mentioning

confidence: 99%

Effect of Elevated Salt Concentrations on the Aerobic Granular Sludge Process: Linking Microbial Activity with Microbial Community Structure

Bassin

Pronk

Muyzer

et al. 2011

Appl Environ Microbiol

168

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The long-and short-term effects of salt on biological nitrogen and phosphorus removal processes were studied in an aerobic granular sludge reactor. The microbial community structure was investigated by PCR-denaturing gradient gel electrophoresis (DGGE) on 16S rRNA and amoA genes. PCR products obtained from genomic DNA and from rRNA after reverse transcription were compared to determine the presence of bacteria as well as the metabolically active fraction of bacteria. Fluorescence in situ hybridization (FISH) was used to validate the PCR-based results and to quantify the dominant bacterial populations. The results demonstrated that ammonium removal efficiency was not affected by salt concentrations up to 33 g/liter NaCl. Conversely, a high accumulation of nitrite was observed above 22 g/liter NaCl, which coincided with the disappearance of Nitrospira sp. Phosphorus removal was severely affected by gradual salt increase. No P release or uptake was observed at steady-state operation at 33 g/liter NaCl, exactly when the polyphosphate-accumulating organisms (PAOs), "Candidatus Accumulibacter phosphatis" bacteria, were no longer detected by PCR-DGGE or FISH. Batch experiments confirmed that P removal still could occur at 30 g/liter NaCl, but the long exposure of the biomass to this salinity level was detrimental for PAOs, which were outcompeted by glycogen-accumulating organisms (GAOs) in the bioreactor. GAOs became the dominant microorganisms at increasing salt concentrations, especially at 33 g/liter NaCl. In the comparative analysis of the diversity (DNA-derived pattern) and the activity (cDNA-derived pattern) of the microbial population, the highly metabolically active microorganisms were observed to be those related to ammonia (Nitrosomonas sp.) and phosphate removal ("Candidatus Accumulibacter").Numerous wastewaters, like those generated in seafood canning, pickling, and cheese-processing industries, can contain significant amounts of inorganic dissolved salts (14). The use of seawater for toilet flushing in ships, offshore installations, and regions with problems related to water supply also introduces salts into freshwater. Wastewaters with a high salt content require the activity of salt-tolerant microorganisms which may not be present in high numbers in microbial inocula from sewage treatment plants. Salt ions exert high osmotic pressure on the microorganisms, and most of the freshwater-based microbial populations are unable to survive at these high osmotic pressures and either die or become dormant under these conditions (40). Besides that, inorganic salts can affect the structure and settling properties of microbial flocs as well as the maximum solubility of oxygen and its transfer to the liquid phase, which can lead to oxygen limitation. Consequently, high salt concentrations have a negative influence on existing biological wastewater treatment plants, affecting organic matter, nitrogen, and phosphorus removal (17). So far, most studies on chemical oxygen demand (COD), N, and P removal from saline wastewa...

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“…The kinetics study depicts the uptake rate of an adsorbate, and obviously this rate controls the residence time of adsorption at the solid-solution interface in the whole adsorption process [59]. In the present study, the experimental data were fitted to the pseudo-first-order and pseudo-second-order kinetic models.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Modeling of Malachite Green Removal from Aqueous Solutions by Nanoscale Zerovalent Zinc Using Artificial Neural Network

Ruan

Shi

et al. 2017

Applied Sciences

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Abstract:The commercially available nanoscale zerovalent zinc (nZVZ) was used as an adsorbent for the removal of malachite green (MG) from aqueous solutions. This material was characterized by X-ray diffraction and X-ray photoelectron spectroscopy. The advanced experimental design tools were adopted to study the effect of process parameters (viz. initial pH, temperature, contact time and initial concentration) and to reduce number of trials and cost. Response surface methodology and rapidly developing artificial intelligence technologies, i.e., artificial neural network coupled with particle swarm optimization (ANN-PSO) and artificial neural network coupled with genetic algorithm (ANN-GA) were employed for predicting the optimum process variables and obtaining the maximum removal efficiency of MG. The results showed that the removal efficiency predicted by ANN-GA (94.12%) was compatible with the experimental value (90.72%). Furthermore, the Langmuir isotherm was found to be the best model to describe the adsorption of MG onto nZVZ, while the maximum adsorption capacity was calculated to be 1000.00 mg/g. The kinetics for adsorption of MG onto nZVZ was found to follow the pseudo-second-order kinetic model. Thermodynamic parameters (∆G 0 , ∆H 0 and ∆S 0 ) were calculated from the Van't Hoff plot of lnKc vs. 1/T in order to discuss the removal mechanism of MG.

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Biosorption of Malachite Green from aqueous solutions onto aerobic granules: Kinetic and equilibrium studies

Cited by 149 publications

References 50 publications

Partial removal and detoxification of Malachite Green and Crystal Violet from laboratory artificially contaminated water by Pleurotus ostreatus

Partial removal and detoxification of Malachite Green and Crystal Violet from laboratory artificially contaminated water by Pleurotus ostreatus

Effect of Elevated Salt Concentrations on the Aerobic Granular Sludge Process: Linking Microbial Activity with Microbial Community Structure

Modeling of Malachite Green Removal from Aqueous Solutions by Nanoscale Zerovalent Zinc Using Artificial Neural Network

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