Organic residues as immobilizing agents in aided phytostabilization: (II) effects on soil biochemical and ecotoxicological characteristics
| Autor: | R.M. Fernandes, Paula Alvarenga, Patrícia Palma, Elizabeth Duarte, A. de Varennes, A.C. Cunha-Queda, Giovanni Vallini, A.P. Gonçalves |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Enzymatic activities
Lolium perenne Health Toxicology and Mutagenesis Leachability Indexação Scopus Soil Soil pH Soil Pollutants Sewage sludge COMPOST Sewage Indexação Thomson Reuters Web of Knwledge Compost Chemistry Metal-contaminated soil HEAVY METALS CONTAMINATED SOIL SEWAGE SLUDGE food and beverages Soil classification ENZYMATIC ACTIVITIES General Medicine Aliivibrio fischeri Pollution Soil contamination Enzymes Biodegradation Environmental Chemosphere Environmental chemistry Indexação ISI Phytotoxicity LEACHABILITY ECOTOXICITY Environmental Engineering Environmental remediation engineering.material complex mixtures Mining Metals Heavy Lolium Animals Environmental Chemistry Ecotoxicidade Ecotoxicity Analysis of Variance fungi Public Health Environmental and Occupational Health General Chemistry Resíduos orgânicos Soil quality Daphnia Agronomy Soil water engineering |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) Agência para a Sociedade do Conhecimento (UMIC)-FCT-Sociedade da Informação instacron:RCAAP |
| Popis: | Sewage 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 phytotoxicity and enzymatic activities, and on the composition and toxicity of the soil leachate towards Vibrio fischeri and Daphnia magna. Application of SS led to the greatest values of dehydrogenase, acid phosphatase, β-glucosidase, protease and urease activities, corresponding to the greatest overall microbial and biochemical activity in amended soils. Conversely, GWC did not increase these enzymatic activities, relative to the unamended soil, or enhance ryegrass growth. Cellulase activity increased with increasing application rates of the amendments tested, but decreased at the highest SS application rate. The organic amendments were able to suppress soil toxicity to levels that did not affect D. magna, when applied at 50 and 100 Mg ha−1, but SS, at the same application rates, increased the soil leachate toxicity towards V. fischeri. Moreover, ryegrass showed some phytotoxic symptoms when 100 Mg ha−1 of SS were applied. This study showed the importance of an integrated evaluation of soil quality on remediation processes. Although SS immobilized trace metals and corrected soil acidity, improving soil biochemical status, when used at high application rates it led to toxicity of soil leachate towards V. fischeri, decreased soil cellulase activity and impaired ryegrass growth. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|