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- W2016232732 abstract "Kraft mills are responsible for large volumes discharges of highly polluted effluents. Application of new bleaching processes (i.e. total chlorine-free (TCF) process) is already a feasible option to reduce environmental impacts. The current trend in the increase in the production of TCF pulp will proportionally increase the consumption of chelating agents. The most commonly used chelants, ethylenediaminetetraacetic acid (EDTA) and diethylenetriaminepentaacetic acid (DPTA) are supposed to be relatively persistent substances, poorly degradable in biological treatment facilities and are subsequently considered as environmentally critical compounds. Adsorption could be used as a treatment technique to remove recalcitrant compounds from wastewaters. However, in most cases, sorbent and regeneration costs can make the whole process not economically feasible. The goal of this study was to evaluate the use of Magallanic peat as non-conventional sorbent for EDTA removal from wastewater. Adsorption studies were carried out considering a 2(3) factorial design. pH, temperature and sorbent/sorbate (S/S) relationship effects were evaluated in EDTA adsorption onto Magallanic peat. In addition, adsorption isotherm constants were determined according to the Langmuir and Freundlich models. The results showed that the optimal conditions for EDTA adsorption onto Magallanic peat were 20 degrees C, acid pH (4.0) and a low sorbent/sorbate ratio (0.1/100). At these conditions Magallanic peat showed an adsorption capacity for EDTA (Cs(sat)) of 128.2mg/g, comparable and even better than activated carbon (Cs(sat) 56.5mg/g). EDTA adsorption data at 60 degrees C obtained are not shown due to Magallanic peat degradation phenomena." @default.
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- W2016232732 date "2008-11-01" @default.
- W2016232732 modified "2023-10-10" @default.
- W2016232732 title "The use of Magallanic peat as non-conventional sorbent for EDTA removal from wastewater" @default.
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- W2016232732 doi "https://doi.org/10.1016/j.biortech.2008.03.064" @default.
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