Adsorption and desorption of lead in Iranian acid and alkaline soils amended with sewage sludge-derived biochar
Journal Title: Journal of Advances in Environmental Health Research (JAEHR) - Year 2017, Vol 5, Issue 2
Abstract
The effective management of sewage sludge materials in an environmentally and economically acceptable way is through the pyrolytic conversion of the sludge to biochar and its use for agricultural purposes. The aims of this work were: (1) to assess the effect of biochar prepared from sewage sludge at two different temperatures (350 ºC and 650 ºC) on the adsorption/desorption capacity of Pb (II) in two different Iranian soils (acidic and alkaline soils), and (2) to investigate the adsorption/desorption isotherm. 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 pyrolysis yield, percentages of H, N and O, atomic ratios, CEC and polarity of biochar decreased. The adsorption and desorption of Pb was more accurately described by the Langmuir isotherm than the Freundlich isotherm The maximum adsorption capacity of biochars increased for alkaline and acidic soils when pyrolysis temperatures increased, suggesting that high temperature pyrolysis led to the biochars having high Pb adsorption capacity. The desorption of pre-adsorbed Pb (II) by NaNO3 decreased in soils incorporated with biochars.
Authors and Affiliations
Hamed Fathi Dokht, Esmaeil Dordipour, Seyed Alireza Movahedi Naeini
Keywords
Related Articles
- EP ID EP424870
- DOI 10.22102/jaehr.2017.71682.
- Views 113
- Downloads 0
The simultaneous removal of turbidity and humic substances from water using the enhanced coagulation process
This study aimed to investigate the efficiency of the enhanced coagulation (EC) process for the simultaneous removal of turbidity and humic substances (HS) from raw water from the Sanandaj Water Treatment Plant (SWTP). T...
New magnetic/Biosilica/Sodium Alginate Composites for removal of Pb (II) ions from aqueous solutions: kinetic and isotherm studies
Lead is one of the heavy metals that have harmful effects on the human health and environment. In this study, a new magnetic/biosilica/sodium alginate adsorbent (MBSA) made by the coprecipitation method was used to remov...
Profit estimation models of industrial and engineering brick manufacturing using UASB reactor sludge
According to a recent report by the Iranian industrial organization, over 1700 Industrial and Engineering Brick Manufacturing (IEBM) industries are currently running in Iran, using the same method in common use worldwide...
Health risk assessment of As and Zn in canola and soybean oils consumed in Kermanshah, Iran
Due to the limited number of researches conducted globally on heavy metals in edible oil, this study was carried out for analysis and health risk assessment of As and Zn in some brands of canola and soybean oils marketed...
Optimization of ammonia removal in an integrated fix-film activated sludge using response surface methodology
In this work, removal of ammonia from synthetic wastewater using integrated fixed-film activated sludge (IFAS) process was optimized using response surface methodology (RSM). The main operating parameters such as ammonia...