9 documents found, page 1 of 1
Caracterização de compostos e de materiais orgânicos para a formulação de subst...
Cunha-Queda, A.C.; Morais, M.C.; Ribeiro, H.M.; Almeida, M.H.Present work aimed the physic-chemical and biological characterization of products obtained from composting of several organic wastes: sewage sludge produced at wastewater treatment plants (WWTP), organic fraction of municipal solid waste (MSW) and, green waste from parks and gardens. A commercial substrate used at nursery plants was also characterized. The compost that presented minor potentiality to be used o...
Organic residues as immobilizing agents in aided phytostabilization: (II) effec...
Gonçalves, A.P.; Fernandes, R.M.; Varennes, A.; Vallini, G.; Duarte, E.; Cunha-Queda, A.C.; Palma, Patrícia; Alvarenga, PaulaSewage sludge (SS), municipal solid waste compost, and garden waste compost (GWC) were used as immobilizing agents in aided phytostabilization of an acid metal-contaminated soil affected by mining activities. The organic residues were applied at 25, 50 and 100 Mg ha−1 (dry weight basis) and perennial ryegrass (Lolium perenne L.) was used as a “green cover”. We studied the effects of the treatments on soil phyto...
Organic residues as immobilizing agents in aided phytostabilization: (I) Effect...
Alvarenga, P.; Gonçalves, A.P.; Fernandes, R.M.; Varennes, A.; Vallini, G.; Duarte, E.; Cunha-Queda, A.C.A greenhouse experiment was conducted to evaluate the effect of three different organic residues, sewage sludge (SS), municipal solid waste compost (MSWC), and garden waste compost (GWC), as immobilizing agents in aided phytostabilization of a highly acidic metal-contaminated soil, affected by mining activities, using perennial ryegrass (Lolium perenne L.). The organic residues were applied at 25, 50 and 100 Mg...
Polyacrylate polymers as immobilizing agents to aid phytostabilization of two m...
Varennes, A.; Cunha-Queda, A.C.; Ramos, A.R.We evaluated the effect of polyacrylate polymers as immobilizing agents to aid phytostabilization of two mine soils. One soil had a very low pH (3.7) and a large Pb content, while the other was less acidic but had a greater content of Cu and Zn. Growth of perennial ryegrass (Lolium perenne L. cv. Victorian) was stimulated in polymer-amended soils. After ryegrass had been growing for 35 days, the amounts of wate...
Remediation of a mine soil with insoluble polyacrylate polymers enhances soil q...
Guiwei, Q.; Varennes, A.; Cunha-Queda, A.C.We investigated the effects of different application rates of insoluble hydrophilic polyacrylate polymers on plant growth and soil quality from a Pb-contaminated mine soil. The polymer increased the waterholding capacity of the soil from about 250 g ⁄ kg in unamended soil to almost 1000 g ⁄ kg in soil with 0.6% polymer. However, the capacity of the polymer to retain water decreased progressively, presumably as ...
Evaluation of composts and liming materials in the phytostabilization of a mine...
Alvarenga, P.; Gonçalves, A.P.; Fernandes, R.M.; Varennes, A.; Vallini, G.; Duarte, E.; Cunha-Queda, A.C.A microcosm experiment was carried out to evaluate the effects of municipal solid waste compost (MSWC) or garden waste compost (GWC), and liming materials in the rehabilitation of a soil affected by mining activities, and to study the use of perennial ryegrass (Lolium perenne L.) for phystostabilization. The performance of the amendments was assessed by soil chemical parameters, total and bioavailable metals (C...
Evaluation of tests to assess the quality of mine-contaminated soils
Alvarenga, P.; Palma, P.; Gonçalves, A.P.; Fernandes, R.M.; Varennes, A.; Vallini, G.; Duarte, E.; Cunha-Queda, A.C.An acid metal-contaminated soil from the Aljustrel mining area (a pyrite mine located in SW Portugal in the Iberian Pyrite Belt) was subjected to chemical characterisation and total metal quantiWcation (Cd, Cr, Cu, Ni, Pb and Zn). Water-soluble metals were determined and a sequential extraction procedure was used to investigate metal speciation. Two bioavailable metal fractions were determined: a mobile fractio...
Assessment of chemical, biochemical and ecotoxicological aspects in a mine soil...
Alvarenga, P.; Palma, P.; Gonçalves, A.P.; Baião, N.; Fernandes, R.M.; Varennes, A.; Vallini, G.; Duarte, E.; Cunha-Queda, A.C.A greenhouse pot experiment was conducted to evaluate the effect of sewage sludge (SS), of sugar beet sludge (SBS), or of a combination of both, in the remediation of a highly acidic (pH 3.6) metal-contaminated soil, affected by mining activities. The SS was applied at 100 and 200 Mg ha 1 (dry weight basis), and the SBS at 7 Mg ha 1. All pots were sown with Italian ryegrass (Lolium multiflorum Lam.). After 60 d...
Estudo da evolução de actividades enzimáticas durante a compostagem de resíduos...
Cunha-Queda, A.C.; Vallini, G.; Sousa, R.B.; Duarte, E.F.A.