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Algorithms and statistics for municipal wastewater treatment using nano zero valent iron (nZVI)

Journal of Environment and Biotechnology Research, Vol. 7, No. 3, Pages 30-44, Jul 2018

Ahmed S. Mahmoud, Marwa M. EL-Tayieb, Neama Ahmed Sobhy Ahmed, Ayman M. Mostafa

DOI: to be updated


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ABSTRACT

Nano Zero Valent Iron (nZVI), one of magnetic nanosorbens, was successfully prepared which is used in the removal of different wastewater contaminants simultaneously without adding any surfactant. The prepared nZVI was characterized by X-Ray diffraction (XRD), Scanning electron microscope (SEM) and Ultraviolet spectrophotometer. The prepared nZVI was tested for domestic wastewater treatment at different operating parameter for pH, nZVI dosage, contact time and stirring rate. The efficiency of treatment was evaluated according to the reduction in turbidity, total nitrogen (TN), total phosphorus (TP), chemical oxygen demand (COD), biological oxygen demand (BOD), ammonia, total suspended solids (TSS), and total dissolved solids (TDS). The optimum conditions for the effective removal was appeared at neutral pH using nZVI with 0.4 g/L dosage for 30 min with fixed stirring rate 150 rpm and the removal percentages was between 13 and 93% for the above mentioned parameter. Statistical analysis using Response surface methodology, Artificial neural networks was studied using linear regression and nonlinear Multi-Layer Perceptron algorithms, respectively, to predict the model’s significance, R2, standard error, probability, accuracy and importance of different covariables. The statistic models can describe the removal behavior of each contaminant in the separate step and estimate individual removal equation for any application.
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Biosorption of chromium(VI) by coconut husk - optimization of adsorption variables and isotherm studies

Journal of Environment and Biotechnology Research, Vol. 7, No. 3, Page 45-53, Jul 2018

N. Sameera, S. Kiran, S.M. Desai

DOI: to be updated


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ABSTRACT

Hexavalent chromium, present in industrial effluents, is a cause of great concern due to its carcinogenicity and toxicity even at trace levels. The present study aimed at determining the feasibility of using adsorption as a method of Cr(VI) removal by using easily and cheaply available agricultural waste such as coconut husk as the adsorbent. Based on central composite design, values of independent variables viz. temperature, pH, initial metal ion concentration and adsorbent dosage were varied to study the Cr(VI) removal efficiency from aqueous solutions by three forms of the biomass - untreated, acid-treated and alkali-treated. The outcome was subjected to regression analysis and the second degree polynomial equation was found to fit the results to a great extent (R2 value > 0.9). The acid-treated form of coconut husk was found to be the best with maximum Cr(VI) removal capacity of 84.1% at 2.4 pH and 34.3 oC temperature, with highest initial metal concentration of 165.5 mg/L and lowest adsorbent usage of 4.89 g/100 mL. The impact of factors affecting the adsorption process, viz. temperature, pH, initial metal ion concentration and adsorbent dosage, was also studied. Further, isotherm studies were conducted which showed that the Langmuir Isotherm fitted the experimental data to a good extent with correlation coefficient R2 > 0.87.
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Current Issue
Journal of Environment and Biotechnology Research
Volume 7, Number 3, Pages 30-53 (Jul 2018)

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