Amir Hossein Baghaie; Raheleh Mirzaee
Abstract
Introduction: In order to optimize the use of industrial wastewater, proper management practices should be applied for wastewater treatment. Thus, this study was done to evaluate the effect of iron slag enriched cow manure, zeolite and pumice on the sunflower Pb concentration in a soil irrigated with ...
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Introduction: In order to optimize the use of industrial wastewater, proper management practices should be applied for wastewater treatment. Thus, this study was done to evaluate the effect of iron slag enriched cow manure, zeolite and pumice on the sunflower Pb concentration in a soil irrigated with wastewater of battery factory. Methods: In this descriptive study, treatments consisted of applying iron slag (0, 1 and 2 % (W/W)) enriched cow manure at the rates of 0 and 30 t/ha, using zeolite (0 and 2 % (W/W)) and pumice (0 and 8 % (W/W), and sunflower irrigation with the wastewater of battery factory mixed with well water with the ratio of 1:1 and 1:2 (water/wastewater). After 60 days, the plant was harvested and the concentration of Pb and Fe was measured using atomic absorption spectroscopy. The SOD enzyme activity was also determined. Results: Application of 2% zeolite and 8% (W/W) pumice significantly decreased the Pb concentration of the soil irrigated with the wastewater at the ratio of 2:1 (wastewater/water) by 8.1%, respectively. The plant Pb concentration was also increased by 11.2 and 13.3%, respectively. The SOD enzyme activity showed a similar trend with the plant Pb concentration. Enrichment of cow manure with iron slag significantly decreased the Pb concentration of the plant that was irrigated with the wastewater at the ratio of 2:1 (wastewater/water) by 11.3% Conclusion: Iron slag enriched cow manure, pumice and zeolite significantly decreased the soil and plant Pb concentration of the soil and plant that was irrigated with wastewater.
Elham Asrari; Esmail Izadi Navan
Abstract
Background: The presence of quantities of dye chemicals in the textile industry effluent is clearly visible and harmful environmental impacts caused by chemical compounds are also as a noticeable challenge. Regarding this issue, control of the pollution has been considered. Methods: In this study, an ...
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Background: The presence of quantities of dye chemicals in the textile industry effluent is clearly visible and harmful environmental impacts caused by chemical compounds are also as a noticeable challenge. Regarding this issue, control of the pollution has been considered. Methods: In this study, an absorbent of Sodium Montmorillonite modified by Methylene Blue dye was used to remove Brilliant Red dye from the textile effluent. All batch experiments were carried out in 250mL of solution of 640 mg/L Methylene Blue with 2g of adsorbent and performed on a shaker with a shaking of 120 rpm; the precipitate was placed in an oven at 60◦C for 24 hours. The effective parameters on the adsorption including: pH, absorbance dose, dye concentration and contact time were optimized by using both one factor at a time technique and Central Composite Design method by designing 30 experiments with four variables (n= 4) and two levels (low (-) and high (+)). Results: The optimal values of the influencing parameters such as pH, absorbance dose, dye concentration and contact time were determined at 6, 0.3 g, 80 mg/L and 60 min with an approximate 92% removal percentage, respectively. The results illustrated that the process was more consistent with Langmuir adsorption isotherm and pseudo-second kinetics equation. Conclusion: The adsorption behaviors of the modified absorbent showed that the adsorption kinetics and isotherms were in good agreement with pseudo-second-order equation and the Langmuir equation, respectively. The potential for regeneration and reuse of the modified absorbent was proved by the desorption studies.