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۱Comparison of Synthetic and Natural Organic Polymers as Flocculant for Textile Wastewater Treatment
اطلاعات انتشار: Iranica Journal of Energy & Environment، پنجم،شماره۴، ۲۰۱۴، سال
تعداد صفحات: ۱۰
Performance of synthetic organic polymer (polyacrylamide) and natural organic polymers (pectin) as flocculant in coagulation–flocculation treatment will be assessed. Analysis of functional group of organic polymer was done by Fourier Transform Infrared Spectroscopy – Attenuated Total Reflectance (FTIR–ATR). Response Surface Methodology – Central Composite Design (RSM–CCD) was used to evaluate the interaction effects of pH, coagulant dose and flocculant dose. The experiment was conducted in lab scale of 500mL of sample textile wastewater with six paddle of conventional jar test. Trimmed Spearman Karber method has been used to estimate median lethal concentration (LC ) values and 50 their confidence intervals. The result shows polyacrylamide added in the treatment was the best at optimum pH 5, coagulant dose at 275 mg\ L and flocculant dose at 35 mg\ L with 88 and 80% removal. In contrast, additions of natural organic flocculant only manage to remove 54.2 and 67 % at the optimum pH 5, coagulant and flocculant dosage at 427.4 and 21.9 mg\ L respectively. However, polyacrylamide treatment claimed to be more toxic based on lethal concentration (LC50) at 17 % compare to natural organic flocculant at 34%.

۲Crude and Pure Bioflocculants Produced from Bacillus subtillis for Low Concentration of Copper (Cu ) Removal
اطلاعات انتشار: Iranica Journal of Energy & Environment، ششم،شماره۲، ۲۰۱۵، سال
تعداد صفحات: ۸
Heavy metals can be found abundantly in earth and being utilized as sources for human being usage. One of the most frequently utilized metals use was copper. Copper was used as a conductor for electrical and electronically product, battery productions, utensils and ornamental purposes due to their conductivity and malleability. Even though copper was very important for human being, excessive exposure of copper to the environment would lead to environmental problems. Since copper possessed an ability to be accumulated into the environment and enter the food chain, efficient techniques to remove copper from wastewater are vital. This paper was focused on biological approaches to remove copper from wastewater using bio flocculants produced by Bacillus subtillis. Important factor such as pH, concentrations of inorganic salt, bio flocculants dosage and initial concentrations of copper were also being studied since copper removal was very dependable on stated variables. Best pH operated for pure bio flocculants was recorded at pH of 6, with 2 mL CaCl2 and 5 g\L dosage of pure bio flocculants for 2, 3, 4 and 5 mg\L initial concentrations of copper. While the best pH operated for crude bio flocculants was recorded at pH 4, with 2mL CaCl2 and 2 and 5 mg\L initial concentrations of copper.
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