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Journal of Advances in Environmental Health Research، جلد ۵، شماره ۲، صفحات ۹۰۰-۹۲۱
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عنوان انگلیسی Adsorption and desorption of lead in Iranian acid and alkaline soils amended with sewage sludge-derived biochar
چکیده انگلیسی مقاله The effective management of sewage sludge materials in an environmentally and economicallyacceptable way is through the pyrolytic conversion of the sludge to biochar and its use for agriculturalpurposes. The aims of this work were: (1) to assess the effect of biochar prepared from sewage sludgeat two different temperatures (3500C and 6500C) on the adsorption/desorption capacity of Pb (II) intwo different Iranian soils (acidic and alkaline soils), and (2) to investigate the adsorption/desorptionisotherm. The results indicated that with increasing pyrolysis temperature, the soil pH, ash content,aromaticity, BET, and total heavy metal concentration increased. On the other hand, the pyrolysisyield, percentages of H, N and O, atomic ratios, CEC and polarity of biochar decreased. Theadsorption and desorption of Pb was more accurately described by the Langmuir isotherm than theFreundlich isotherm The maximum adsorption capacity of biochars increased for alkaline and acidicsoils when pyrolysis temperatures increased, suggesting that high temperature pyrolysis led to thebiochars having high Pb adsorption capacity. The desorption of pre-adsorbed Pb (II) by NaNO3decreased in soils incorporated with biochars.
کلیدواژه‌های انگلیسی مقاله soils,sewage sludge,environmentally
نویسندگان مقاله حامد فتحی دخت | fathi dokht
ph.d student, department of soil sciences, gorgan university of agricultural sciences and natural resources, gorgan ,iran.
سازمان اصلی تایید شده: دانشگاه گلستان (Golestan university)

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