Effects of the presence of a composted biosolid on the metal immobilizing action of an urban soil

Assisted attenuation of a soil contaminated by diuron using hydroxypropyl-β-cyclodextrin and organic amendments

“…The main difference between the residues is the organic matter content (i.e., it is much higher in the USR compost than in the SS compost because of the former's origin). The potentially toxic elements (Cd, Cu, Pb, Zn) of SS do not cause negative effects following its application to soil, as demonstrated by Madrid and Florido (2010), who did not observe increases in soil metal solubility using the same SS amendment, even at higher rates than used in this assay.…”

Role of organic amendments on enhanced bioremediation of heavy metal(loid) contaminated soils

“…As a working definition for EPA to use in risk assessment and risk management decision-making, bioavailability of metals is the extent to which bioaccessible metals adsorb onto or absorb into and across biological membranes of organisms [11]. Bioavailability can be minimized through chemical and biological immobilization of metal(loid)s using a range of inorganic compounds, such as lime and phosphate (P) compounds (e.g., apatite rocks), and organic compounds, such as 'exceptional quality' biosolid which meets the highest level of quality in three categories: (1) reduction of pathogens; (2) reduction of vector attraction (odor); and (3) low concentrations of specific metals [12][13][14][15]. The more localized metal contamination found in urban environments (e.g., Cr contamination in timber treatment plants) is remediated by metal mobilization processes that include phytoremediation (including phytovolatilization) and chemical washing [16][17][18].…”

Roof Runoff Water as Source of Pollution: A Case Study of Some Selected Roofs in Orlu Metropolis, Imo State, Nigeria

“…Higher value of Pb and Cd could be due to tendency of Pb to strongly adhere to particles [42], Pb and Cd are associative [43]. Cd, Zn and Pb which were not detected in TR runoff sample may be due to the tendency of this roof type to retain heavy metals, owing to stabilization of the media through repeated wetting, drying cycles and formation of chelates with organic materials [37,44], since composited biosolids have been found to lower the solubility of Zn and increases its retention [45].…”