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Cr(III) removal from synthetic and industrial wastewaters by using co-gasification chars of rice waste streams
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Orientador(es)
Resumo(s)
ABSTRACT: Blends of rice waste streams were submitted to co-gasification assays. The resulting chars (G1C and G2C) were characterized and used in Cr(III) removal assays from a synthetic solution. A Commercial Activated Carbon (CAC) was used for comparison purposes. The chars were non-porous materials mainly composed by ashes (68.3-92.6% w/w). The influences of adsorbent loading (solid/liquid ratio - S/L) and initial pH in Cr(III) removal were tested. G2C at a S/L of 5 mg L-1 and an initial pH of 4.50 presented an uptake capacity significantly higher than CAC (7.29 and 2.59 mg g(-1), respectively). G2C was used in Cr(III) removal assays from an industrial wastewater with Cr(III) concentrations of 50, 100 and 200 mg L-1. Cr(III) removal by precipitation (uptake capacity ranging from 11.1 to 14.9mg g(-1)) was more effective in G2C, while adsorption (uptake capacity of 16.1 mg g(-1)) was the main removal mechanism in CAC.
Descrição
Palavras-chave
Thermochemical processes Gasification Rice wastes Wastewater treatment Waste valorization Chromium Industrial wastewaters
Contexto Educativo
Citação
Dias, D.; Lapa, N.; Bernardo, M... [et.al.]. - Cr(III) removal from synthetic and industrial wastewaters by using co-gasification chars of rice waste streams. In: Bioresource Technology, 2018, Vol. 266, p. 139-150