Fate of nickel in a lime-stabilized biosolid, a calcareous soil and soil-biosolid mixtures.
Soil contamination with anthropogenic metals resulting from biosolid application is widespread around the world. To better predict the environmental fate and mobility of contaminants, it is critical to study the capacity of biosolid-amended soils to retain and release metals. In this paper, nickel adsorption onto a calcareous soil, a lime-stabilized biosolid, and soil-biosolid mixtures (30, 75, and 150 t biosolid/ha) was studied in batch experiments. Sorption experiments showed that (1) Ni adsorption was higher onto the biosolid than the calcareous soil, and (2) biosolid acted as an adsorbent in the biosolid-soil mixtures by increasing Ni retention capacity. The sorption tests were complemented with the estimation of Ni adsorption reversibility by successive applications of extraction solutions with water, calcium (100 mg/L), and oxalic acid (equivalent to 100 mg carbon/L). It has been shown that Ni desorption rates in soil and biosolid-amended soils were lower than 30 % whatever the chemical reagent, indicating that Ni was strongly adsorbed on the different systems. This adsorption/desorption hysteresis effect was particularly significant at the highest biosolid concentration (150 t/ha). Finally, an adsorption empirical model was used to estimate the maximum permissible biosolid application rate using French national guideline. It has been shown that desorption effects should be quantitatively considered to estimate relevant biosolid loadings.
Institut de Chimie Moléculaire de Reims (ICMR), UMR CNRS 7312, Université de Reims Champagne-Ardenne, Faculté des Sciences, B.P. 1039, 51687, Reims Cedex 2, France.
Yannick
Y
Mamindy-Pajany
Institut de Chimie Moléculaire de Reims (ICMR), UMR CNRS 7312, Université de Reims Champagne-Ardenne, Faculté des Sciences, B.P. 1039, 51687, Reims Cedex 2, France.
Stéphanie
S
Sayen
Institut de Chimie Moléculaire de Reims (ICMR), UMR CNRS 7312, Université de Reims Champagne-Ardenne, Faculté des Sciences, B.P. 1039, 51687, Reims Cedex 2, France. emmanuel.guillon@univ-reims.fr.
Emmanuel
E
Guillon
D000327:Adsorption; D017610:Calcium Compounds / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry; D004784:Environmental Monitoring; D052918:Environmental Restoration and Remediation / Q000379:methods; D008956:Models, Chemical; D009532:Nickel / Q000032:analysis*; D010087:Oxides / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D014865:Waste Disposal, Fluid
D017610:Calcium Compounds; D010087:Oxides; D012987:Soil; D012989:Soil Pollutants; D002244:Carbon; D009532:Nickel; C016538:lime