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https://hdl.handle.net/1822/90286
Título: | A circular approach for landfill leachate treatment: Chemical precipitation with biomass ash followed by bioremediation through microalgae |
Autor(es): | Viegas, Catarina Nobre, Catarina Mota, André Manuel Oliveira Vilarinho, Cândida Gouveia, Luisa Gonçalves, Margarida |
Palavras-chave: | Landfill leachate treatment Bottom ash Precipitation Mortars Microalgae Wastewater treatment |
Data: | Fev-2021 |
Editora: | Elsevier 1 |
Revista: | Journal of Environmental Chemical Engineering |
Citação: | Viegas, C., Nobre, C., Mota, A., Vilarinho, C., Gouveia, L., & Gonçalves, M. (2021, June). A circular approach for landfill leachate treatment: Chemical precipitation with biomass ash followed by bioremediation through microalgae. Journal of Environmental Chemical Engineering. Elsevier BV. http://doi.org/10.1016/j.jece.2021.105187 |
Resumo(s): | The aim of this work was to study an integrated approach for landfill leachate remediation comprising chemical precipitation with biomass bottom ash as a pre-treatment to reduce color and turbidity followed by bioremediation through microalgae treatment for effluent disposal. Optimal pre-treatment conditions were determined through batch experiments and were found to be 160 g L 1 ash dose, 96 h of contact time, overhead agitation at 15 rpm and ash particle size below 500 μm. These conditions led to removal efficiencies of 74.3% for chemical oxygen demand and 98.5% for color. Large quantities of sludge containing excess biomass ash and precipitated compounds were formed during the pre-treatment. To minimize solid disposal, this sludge was tested as a raw material for cementitious and aggregate substitute in mortar formulations. Following the pre-treatment, the leachate was inoculated with six different microalgae species to evaluate their ability to grow in such a recalcitrant effluent and remediate it. After a period of 27 days biomass concentration from 0.4 to 1.2 g L 1 were achieved for the tested microalgae. Removal efficiencies were in the range of 18–62% for COD, 63–71% for N, and 15–100% for P. At the end of the treatment, algal biomass was characterized regarding protein, lipid, fatty acids, carbohydrate, and ash contents. This approach allows a low-cost remediation of these recalcitrant effluents when compared with the present options that include inverse osmosis, and the valorization of ash-rich precipitates and microalgae biomass improves the sustainability of the overall process. |
Tipo: | Artigo |
Descrição: | Supplementary data associated with this article can be found in the online version at doi: 10.1016/j.jece.2021.105187. |
URI: | https://hdl.handle.net/1822/90286 |
DOI: | 10.1016/j.jece.2021.105187 |
ISSN: | 2213-2929 |
Versão da editora: | https://www.sciencedirect.com/science/article/pii/S2213343721001640 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | MEtRICs - Artigos em revistas internacionais/Papers in international journals |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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A circular approach for landfill leachate treatment Chemical precipitation.pdf | 1,01 MB | Adobe PDF | Ver/Abrir |