Heavy metals in sewage sludge amended soils determined by sequential extractions as a function of incubation time of soils

Sánchez-Martín, María J.; García-Delgado, M.; Lorenzo, L.F.; Rodríguez‐Cruz, M. Sonia; Arienzo, Michele

doi:10.1016/j.geoderma.2007.08.012

Cited by 75 publications

(32 citation statements)

References 41 publications

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“…Total metal concentration provides little indication of metal specification bioavailability, mobility and reactivity in soil samples [19,20]. Total content was the predominant fraction for most of the studied metals (Table 2).…”

Section: Isolation Of Micro-organisms From Polluted Sitesmentioning

confidence: 99%

Biosorption of Heavy Metals onto Different Eco-Friendly Substrates

Fawzy¹,

Abdel-Motaal²,

El-Zayat³

2017

J Bioremediat Biodegrad

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Aims and BackgroundThe basic environmental elements constituting ecosystem is the soil, which is the important material basis of human being to survive and develop. The contaminated soil by heavy metals manifests as concealment, accumulation, irreversibility and protraction. To prevent the heavy metal contamination, sources of contamination should be controlled and remediation of contaminated soils should be enhanced [1]. Recently, decreasing the amount of pollutants and improving the quality of the treated soils have been studied for the development of cheaper and more effective remediation technique. One of the most alternative treatments is adsorption. The adsorbents may be of mineral, organic or biological origin, zeolites, industrial byproducts, agricultural wastes, biomass, and polymeric materials [2]. Microorganisms (bacteria, fungi and algae) are effective heavy metal sequestration for physicochemical methods [3][4][5][6][7]. Removal of potentially toxic metals from polluted industrial and domestic effluents have already been used in large scale using certain microorganisms. These microorganisms have been shown to possess an ability to survive by adapting or mutating at high concentrations of toxic heavy metals. To increase the tolerance of fungi for the bioleaching process, the adaptation of these fungi exposed to heavy metal ions has been examined and developed [8].Generally, two mechanisms have been proposed for heavy metal tolerance in fungi. The first one is an extracellular (chelation and cellwall binding) sequestration and the second is intracellular physical sequestration of metal by binding to proteins or other ligands to prevent it from damaging the metal sensitive cellular targets. Thus, extracellular mechanisms are mainly implied in the avoidance of metal entry, whereas intracellular systems aim to reduce the metal burden in the cytosol. In the first mechanism, different organic molecules that do not belong to the matrix of the cell wall are excreted by the fungal cell to chelate metal ions. Binding to the cell wall is called biosorption. The presence of various anionic structures, such as glucan and chitin gives negatively charged to the cell surface of microorganisms [9,10], which gives microorganisms the ability to bind metal cations. In the intracellular mechanism, metal transport proteins may be involved in metal tolerance, either by extruding toxic metal ions from the cytosol out of the cell or by allowing metal sequestration into vacuolar compartment [11,12]. Biosorption of Heavy Metals onto Different Eco-Friendly Substrates AbstractFungi play an important role in biosorption of heavy metals in heavily contaminated soils. Five metals-tolerant fungal species were isolated from two different contaminated soils (soil 1 and soil 2). The number of fungal colonies isolated from the contaminated soil 2 was higher than that of soil 1. The most resistant fungal species for the toxic studied metals (Pb, Cd, Cu and Zn) was Rhizopus stolonifier followed by Macrophomina phaseolina. It was establi...

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Section: Isolation Of Micro-organisms From Polluted Sitesmentioning

confidence: 99%

Biosorption of Heavy Metals onto Different Eco-Friendly Substrates

Fawzy¹,

Abdel-Motaal²,

El-Zayat³

2017

J Bioremediat Biodegrad

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“…In the past few years, studies on urban soils in many cities have been carried out around the world. Some examples are Spanish [19,71] and Italian cities [21,72]. Other examples for European cities are Aberdeen [73], Athens [74], Oslo [22] and Belgrade [18].…”

Section: Soilmentioning

confidence: 99%

Metal Contamination of Soils and Prospects of Phytoremediation in and Around River Yamuna: A Case Study from North-Central India

Paul¹,

Varun²,

D’Souza³

et al. 2014

Environmental Risk Assessment of Soil Contamination

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“…But, the high Cd and Hg levels might also suggest that secondary wastewater is causing a buildup of soil cadmium and mercury levels on the cultivated plots. In particular, Cd has a relatively higher adsorption capacity to clays than other heavy metals (Sanchez et al, 1999) and higher mobility index (Sánchez-Martín et al, 2007). The second major observation that might be made is that, based on FAO (1985) recommended maximum levels of trace elements for crop production, the wastewater irrigated soils in the Glen Valley have higher than the recommended levels of Cd (e"0.01), Ni (e"0.20) and Cu (e"0.20) while the levels of Hg, Pb and Zn are lower than the maximum threshold values recommended for crop production.…”

Section: Heavy Metalsmentioning

confidence: 99%

“…Further, the use of wastewater and sludge in agricultural lands was found to enrich soils with heavy metals to concentrations that may pose potential environmental and health risks in the long-term (Sánchez-Martín et al, 2007;Tabari et al, 2008). Nwuche and Ugoji (2008) found heavy metal concentrations adversely affected the biological health of the soil manifested in lower rates of nitrogen mineralization, lower soil microbial biomass carbon and reduced rate of respiration by soil microbial population.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of heavy metal concentration in secondary treated wastewater irrigated soils cultivated by different crops

Dikinya

Areola

2010

Int. J. Environ. Sci. Technol.

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ABSTRACT:The use of treated urban wastewater for irrigation is a relatively recent innovation in Botswana and knowledge is still limited on its impact on soil heavy metal levels. The aim of this study is to analyze and compare heavy metal concentration in secondary wastewater irrigated soils being cultivated to different crops: olive, maize, spinach and tomato in the Glen Valley near Gaborone City, Botswana. The studied crop plots have been cultivated continuously under treated wastewater irrigation for at least 3 years. Most crop farms have sandy loam, loamy sand soils. Based on food and agriculture organization, heavy metal threshold values for crop production have been studied. Results showed that the wastewater irrigated soils in the Glen Valley have higher cadmium, nickel and copper than desirable levels, while the levels of mercury, lead and zinc are lower than the maximum threshold values recommended for crop production. The control sites show that the soils are naturally high in some of these heavy metals (e.g copper, zinc, nickel) and that crop cultivation under wastewater irrigation has actually lowered the heavy metal content. Comparing between the crops, mercury and cadmium levels are highest in soils under maize and decline linearly from maize to spinach to olive to tomato and control site. By contrast, concentrations of the other metals are at their lowest in maize and then increase from maize to spinach to olive to tomato and to control site.

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Heavy metals in sewage sludge amended soils determined by sequential extractions as a function of incubation time of soils

Cited by 75 publications

References 41 publications

Biosorption of Heavy Metals onto Different Eco-Friendly Substrates

Biosorption of Heavy Metals onto Different Eco-Friendly Substrates

Metal Contamination of Soils and Prospects of Phytoremediation in and Around River Yamuna: A Case Study from North-Central India

Comparative analysis of heavy metal concentration in secondary treated wastewater irrigated soils cultivated by different crops

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