Purification of Contaminated Water with Chromium (VI) Using Pseudomonas aeruginosa

2016 ◽  
Vol 721 ◽  
pp. 143-148 ◽  
Author(s):  
Nora Noureddine ◽  
Samia Benhammadi ◽  
Fouad Kara ◽  
Hakim Aguedal ◽  
Abdelkader Iddou ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Hexavalent Chromium ◽  
Contact Time ◽  
Culture Broth ◽  
Contaminated Water ◽  
Toxic Heavy Metals ◽  
Initial Concentration ◽  
Chromium Vi ◽  
Batch System ◽  
Uncontaminated Soil

A bacterial strain Pseudomonas aeruginosa isolated from an uncontaminated soil has been used for the removal of hexavalent chromium (Cr (VI)). The experiments were carried out in batch system in a culture broth. The results obtained have shown that 100% of Cr (VI) are removed. Contact time, initial concentration of the hexavalent chromium, temperature, as well as the nature of the culture broth have influenced this elimination. To the initial concentration of 20g/L of Cr (VI) the elimination rates are lower, while the reverse occurs for an initial concentration of 8g/L. This study allows considering the use of Pseudomonas aeruginosa in the treatment of water polluted by toxic heavy metals such as Cr (VI).

scholarly journals Photocatalytic Degradation of Naphthalene By UV/Zno: Kinetics, Influencing Factors and Mechanisms

2021 ◽  
Vol 37 (1) ◽  
pp. 65-70
Author(s):  
Aram Dokht Khatibi ◽  
Kethineni Chandrika ◽  
Ferdos Kord Mostafapour ◽  
Ali Akbar Sajadi ◽  
Davoud Balarak
Keyword(s):  
Wastewater Treatment ◽  
Reaction Time ◽  
Aqueous Solutions ◽  
Aromatic Hydrocarbons ◽  
Contact Time ◽  
Initial Concentration ◽  
Applied Study ◽  
Batch System ◽  
Initial Ph ◽  
Conventional Wastewater Treatment

Conventional wastewater treatment is not able to effectively remove Aromatic hydrocarbons such as Naphthalene, so it is important to remove the remaining antibiotics from the environment. The aim of this study was to evaluate the efficiency of UV/ZnOphotocatalytic process in removing naphthalene antibiotics from aqueous solutions.This was an experimental-applied study that was performed in a batch system on a laboratory scale. The variables studied in this study include the initial pH of the solution, the dose of ZnO, reaction time and initial concentration of Naphthalene were examined. The amount of naphthalene in the samples was measured using GC.The results showed that by decreasing the pH and decreasing the initial concentration of naphthalene and increasing the contact time, the efficiency of the process was developed. However, an increase in the dose of nanoparticles to 0.8 g/L had enhance the efficiency of the process was enhanced, while increasing its amount to values higher than 0.8 g/L has been associated with a decrease in removal efficiency.The results of this study showed that the use of UV/ZnOphotocatalytic process can be addressed as a well-organized method to remove naphthalene from aqueous solutions.

scholarly journals Adsorption of hexavalent chromium ions from aqueous solutions using nano-chitin: kinetic, isotherms and thermodynamic studies

2021 ◽  
Vol 16 (2) ◽  
pp. 436-451
Author(s):  
Meghdad Sheikhi ◽  
Hassan Rezaei
Keyword(s):  
Aqueous Solutions ◽  
Correlation Coefficient ◽  
Hexavalent Chromium ◽  
Contact Time ◽  
New Technology ◽  
Kinetic Studies ◽  
Chromium Vi ◽  
Effects Of Ph ◽  
Pseudo Second Order ◽  
Adsorbent Dose

Abstract Treatment of the industrial wastewater before discharging into aquatic ecosystems using a new technology such as nanotechnology seems necessary. There are different methods for the removal of the heavy metals in the wastewater. In this study, nano-chitin was purchased from the Nano-Novin Polymer Company and used as an adsorbent for the removal of chromium (VI) ions from aqueous solution in a batch system. The effects of pH, temperature, contact time, concentration, and adsorbent dose were investigated. According to the results, the optimum conditions of adsorption occurred at pH = 6, temperature = 25 °C, 60 minutes contact time, and 0.6 g·L−1 adsorbent dose. Investigation of equilibrium isotherms showed that the isotherm fitted the Freundlich model with a correlation coefficient of R2 = 0.9689. The pseudo second-order model with the larger correlation coefficient had a greater fitness against experimental data in the kinetic studies. Thermodynamic parameters such as Gibbs free energy, enthalpy, and entropy were calculated, which indicated spontaneous, endothermic, and random processes, respectively. Given the good results of this project, nano-chitin can be suggested as a novel adsorbent which is highly capable of adsorbing hexavalent chromium from aqueous solutions.

scholarly journals Removal of hexavalent chromium from graphene oxide supported on a cellulose acetate and polyacrylic acid membrane

2021 ◽  
pp. 1-8
Author(s):  
Juan SÁNCHEZ-MÁRQUEZ ◽  
Rosalba FUENTES-RAMÍREZ ◽  
Zeferino GAMIÑO-ARROYO
Keyword(s):  
Graphene Oxide ◽  
Cellulose Acetate ◽  
Hexavalent Chromium ◽  
Polyacrylic Acid ◽  
Contact Time ◽  
Polymeric Membrane ◽  
Point Of Zero Charge ◽  
Inversion Method ◽  
Initial Concentration ◽  
Phase Inversion Method

This work focused on the study of the hexavalent chromium removal process from graphene oxide supported on a cross-linked cellulose acetate and polyacrylic acid polymeric membrane. The membranes were synthesized by the phase inversion method and Graphene oxide was added in proportions of 1% by weight to the polymeric material. Graphene oxide was obtained from crystalline graphite (Electron Microscope Science, No. 70230). The graphite was oxidized using the improved method of Hummers. The characterization of polymer and graphene oxide was made by Raman spectroscopy. The surface charge and point of zero charge of the materials were evaluated using a potentiometric titration method proposed by Loskutov and Kuzin. The removal of Cr (VI) was studied as a function of contact time and of initial concentration of Cr (VI). The removal of Cr (VI) (~90%) mainly occurs in a contact time from 32 to 64 h when the initial concentration of Cr (VI) is 1 mg/L.

scholarly journals Effective Removal of Hexavalent Chromium from Polluted Water using Phoenix sylvestris Seed Powder as Adsorbent

2019 ◽  
Vol 31 (6) ◽  
pp. 1327-1331
Author(s):  
P. KARUNASRI MEGHANA ◽  
K. VENKATA PRAVALIKA ◽  
P. JANAKI SRIRAM ◽  
K. RAVINDHRANATH
Keyword(s):  
Adsorption Capacity ◽  
Hexavalent Chromium ◽  
Extraction Method ◽  
Contact Time ◽  
Industrial Effluents ◽  
Polluted Water ◽  
Chromium Vi ◽  
Effective Removal ◽  
Maximum Extraction ◽  
Fold Excess

Phoenix sylvestris seed powder (PSSP) was investigated as an adsorbent for the removal of chromium(VI) ions from water using batch extraction method. The conditions for the maximum extraction were optimized. The adsorption capacity was found to be 22.5 mg/g at pH= 2, contact time: 60 min, PSSP dosage: 0.40 g/500mL, rpm: 300 and temp.: 28 ± 2 ºC and found to be more suitable adsorbant than compared to other reported adsorbents in the literature. Co-ions even in five-fold excess were less interfered. Regeneration studies revealed that Phoenix sylvestris seed powder can be used up to three cycles. The method developed was successfully applied to polluted water/industrial effluents samples.

scholarly journals Biosorption of Pb (II) from aqueous solutions by modified of two kinds of marine algae, Sargassum glaucescens and Gracilaria corticata

2012 ◽  
Vol 14 (2) ◽  
pp. 22-28 ◽  
Author(s):  
Akbar Esmaeili ◽  
Mona Kalantari ◽  
Betsabe Saremnia
Keyword(s):  
Aqueous Solutions ◽  
Contact Time ◽  
Marine Algae ◽  
Rate Model ◽  
Initial Concentration ◽  
Batch System ◽  
Gracilaria Corticata ◽  
Adsorption Data ◽  
Langmuir Isotherm Model ◽  
Maximum Removal

Biosorption of Pb (II) from aqueous solutions by modified of two kinds of marine algae, Sargassum glaucescens and Gracilaria corticata In this research, the batch removal of Pb2+ ions from wastewater and aqueous solution with the use o two different modified algae Gracilaria corticata (red algae) and Sargassum glaucescens (brown algae) was examined. The experiment was performed in a batch system and the effect of the pH solution; initial concentration and contact time on biosorption by both biomasses were investigated and compared. When we used S. glaucescens as a biosorbent, the optima conditions of pH, Pb2+ concentration and equilibrium time were at 5, 200 mg/L and 70 min, in the range of 95.6% removal. When G. corticata was used for this process, pH 3, 15 mg/L pb2+ concentration and 50 min contact time, resulted in the maximum removal (86.4%). The equilibrium adsorption data are fitted to the Frundlich and Langmuir isotherm model, by S. glaucescens and G. corticata, respectively. The pb2+ uptake by both biosorbent was best described by the second-order rate model.

scholarly journals Adsorption of Chromium(VI) on Radiation Grafted N,N-dimethylaminoethylmethacrylate onto Polypropylene, from Aqueous Solutions

2017 ◽  
Vol 57 (2) ◽  
Author(s):  
Guillermina Burillo ◽  
Juan Serrano-Gómez ◽  
Juan Bonifacio-Martínez
Keyword(s):  
Contact Time ◽  
Metal Ion ◽  
Adsorption Process ◽  
Maximum Adsorption Capacity ◽  
Ion Adsorption ◽  
Initial Concentration ◽  
Chromium Vi ◽  
Adsorption Data ◽  
Initial Ph ◽  
Chromium Adsorption

Polypropylene (PP) grafted with dimethylaminoethylmethacrylate (DMAEMA), was prepared by irradiation with a <sup>60</sup>Co γ source. The obtained PP-<em>g</em>-DMAEMA was used to study the Cr(VI) ion adsorption as a function of contact time, initial pH, initial concentration of metal ion and temperature. Chromium adsorption data on PP-<em>g</em>-DMAEMA at various initial concentration fit well the Freundlich and Langmuir isotherms. The maximum adsorption capacity (a<sub>max</sub>) was found to be 0.3103 × 0<sup>-4</sup> mol g<sup>-1</sup>. The thermodynamic parameters ΔH<sup>0</sup>, ΔG<sup>0</sup> and ΔS<sup>0</sup> were estimated showing the adsorption process to be exothermic and spontaneous.

scholarly journals Adsorptive Removal of Cobalt (II) and Chromium (III) from Aqueous Solution onto Citrus Limon Leaves Powder

2021 ◽  
Vol 10 (3) ◽  
pp. 2446-2458
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Optimum Condition ◽  
Contact Time ◽  
Citrus Limon ◽  
Initial Concentration ◽  
Adsorptive Removal ◽  
Removal Process ◽  
Batch System

The growth of heavy metals in wastewater is a widespread concern that affects thousands of lives and spread diseases worldwide. Its extraction is subject of concert from last few decades. Looking forward in the current study, Citrus Limon leaves were used as an adsorbent for the Biosorption of Co(II) and Cr(III) in a batch system. Citrus Limon leaves were brought from the local garden of Amakhel, Tank, Pakistan. The removal process of Co(II) and Cr(III) was examined under different conditions of pH, contact time, and initial concentration to get the optimum condition. It was found optimum contact time for Co(II) and Cr(II) was 20 and 10 minutes. By the increase of concentration of adsorbate, the value of qe was investigated for Co(II) and Cr(III) at 20oC. The optimum initial concentration for Cr(III) and Co(II) was 60 ppm and 40 ppm, respectively. The optimum shaking power for Cr(III) and Co(II) was found to be 150 rpm and 120 rpm, respectively.

A comparative study of chromium(VI) removal using sawdust and eucalyptus bark

2009 ◽  
Vol 9 (4) ◽  
pp. 343-347
Author(s):  
Abhinav Sharma ◽  
Aditya Tulsyan ◽  
Srinivas Motamarri
Keyword(s):  
Comparative Study ◽  
Hexavalent Chromium ◽  
Low Cost ◽  
Industrial Area ◽  
Contaminated Water ◽  
Tannery Effluent ◽  
Freundlich Isotherms ◽  
Chromium Vi ◽  
Experimental Parameters ◽  
Eucalyptus Bark

A comparative study on low cost biological adsorbents such as eucalyptus bark and sawdust has analyzed them for their effectiveness in the removal of hexavalent chromium. Batch experiments were carried out on synthetic solutions mimicking bore water collected from an industrial area contaminated with tannery effluent. The analysis on hexavalent chromium removal was carried out by varying experimental parameters such as pH, dosage and contact time. The study reveals that sawdust works best at pH 3 while eucalyptus shows better results at pH 2. Moreover, the optimum dosages determined for the absorbents were in compliance with the Langmuir and Freundlich isotherms. The study highlights the benefits of eucalyptus bark in purification of Cr(VI) contaminated water supply.

scholarly journals Adsorption Studies of Chromium by Using Low Cost Adsorbents

Our Nature ◽  
2013 ◽  
Vol 11 (1) ◽  
pp. 11-16 ◽  
Author(s):  
N. Gandhi ◽  
D. Sirisha ◽  
K.B. Chandra Sekhar
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Contact Time ◽  
Low Cost ◽  
Water Bodies ◽  
Batch Adsorption ◽  
Toxic Heavy Metals ◽  
Adsorption Studies ◽  
Chromium Vi ◽  
Aqueous Streams

The presence of toxic heavy metals such as chromium (VI) contaminants in aqueous streams, arising from the discharge of untreated metal containing effluents into water bodies, is one of the most important environmental problems. Adsorption is one of the effective techniques for chromium (VI) removal from wastewater. In the present study, adsorbent was prepared from low cost adsorbents and studies were carried out for chromium (VI) removal. Batch adsorption studies demonstrated that the adsorbents had significant capacity to adsorb the chromium from aqueous solution. It was found that the adsorption increased with increase in contact time and adsorbent dosage. An attempt was made to study mixed algae as an adsorbent for removal of chromium (VI).DOI: http://dx.doi.org/10.3126/on.v11i1.8238 Our Nature Vol.11(1) 2013: 11-16?

scholarly journals Optimizing Parameters for the Remediation of Chromium(VI) Contaminated Groundwater on Tamil Nadu Chromates and Chemicals Limited (TCCL) Site of Ranipet, Tamilnadu using Electrocoagulation Process

2021 ◽  
Vol 33 (2) ◽  
pp. 276-280
Author(s):  
B. MUTHUKUMARAN ◽  
VANITHA MURUGAIYAN
Keyword(s):  
Energy Consumption ◽  
Tamil Nadu ◽  
Contaminated Groundwater ◽  
Contaminated Water ◽  
Optimum Conditions ◽  
Applied Current ◽  
Time Duration ◽  
Initial Concentration ◽  
Chromium Vi ◽  
Electrocoagulation Process

This paper presents the effects of variables such as electrode material, electrode distance, pH, initial concentration of Cr(VI), applied current, electrolyte and time duration in the treatment of contaminated groundwater for the removal of Cr(VI) at two different concentrations of 200 and 800 mg/L of Cr(VI) using batch electrocoagulation process. Initially, the conditions were optimized from synthetic contaminated water, which was in congruence with chloride and sulphate ions as present in the contaminated groundwater. The optimum conditions obtained on removal of Cr(VI) from synthetic contaminated water were applied in real Cr(VI) contaminated groundwater collected from a bore well at chromate ore processing residue (COPR) dumpsite. The results of the treated contaminated groundwater were found that all the parameters were within the limits of Pollution Control Board discharge standards. The efficiency and energy consumption on the removal of Cr(VI) from real contaminated groundwater were compared with and without addition of NaCl. The results suggest that the optimum conditions for a 99.99% removal efficiency were initial concentration 200 mg/L of Cr(VI), pH 6.0, applied current 2 A, electrolyte 2 g/L of NaCl, time duration 35 min and energy consumption 2.625 Whr/m3.

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