10 documents found, page 1 of 1
Acacia sp. bark: from waste to a nature-based solution for water treatment
Ferreira, R.; Coura, R. D.; Nunes, L.; Ferraz, A. I.; Rodrigues, A. C.Coagulation-flocculation is an important process in water treatment plants. Recent studies have shown the potential of condensed tannins for the production of coagulants of natural origin, as an alternative to chemical coagulants. The present study highlights the importance of the development of nature-based solutions that can be alternative to conventional processes and is focused on optimizing the process of ...
Chromium(III) biosorption onto spent grains residual from brewing industry : eq...
Ferraz, A. I.; Amorim, C.; Tavares, T.; Teixeira, J. A.The use of industrial wastes for wastewater treatment as a strategy to their re-use and valorisation may provide important advances toward sustainability. The present work gives new insights into heavy metal biosorption onto low-cost biosorbents, studying chromium(III) biosorption onto spent grains residual from a Portuguese brewing industry both in batch and expanded bed column systems. Experimental studies in...
Mechanisms of Cr(III) biosorption onto residual brewer's yeast
Ferraz, A. I.; Costa, Filomena; Tavares, M. T.; Teixeira, J. A.The knowledge and understanding of metal-biomass interactions is crucial to develop and maximize biosorption processes potential to the concentration, removal and recovery of heavy metals from dilute solutions, as well as to define strategies to regenerate and reuse biosorbent in multiple cycles (Ahluwalia and Goyal, 2007; Volesky, 2001). It also turns possible biosorption optimization at a molecular level, inc...
Removal of copper (II), chloride and methylene blue using eggshell residues as ...
Castro, Ana Margarida; Ferraz, A. I.; Carvalho, Joana; Castro, Fernando
Utilização de sub-produtos da indústria cervejeira na remoção de crómio trivale...
Ferraz, A. I.O enquadramento legal que define as orientações relativas à protecção ambiental tem evoluído no sentido de restringir os valores paramétricos de descarga de águas residuais para limites mais apertados e fomentar uma gestão de resíduos e efluentes industriais assente na minimização da sua produção e na sua reutilização. Esta tendência é, a par da necessidade de reduzir os custos inerentes ao tratamento e deposiç...
Sorption of Cr(III) from aqueous solutions by spent brewery grain
Ferraz, A. I.; Tavares, M. T.; Teixeira, J. A.Two types of spent brewery grains were tested for Cr(III) uptake from aqueous solutions: not treated spent grains (NTSG), obtained by abundant washing of spent grain obtained from a Portuguese brewing industry with distilled water, and treated spent grain (TSG), prepared by treating NTSG with NaOH 0.5 M for four hours followed by washing with distilled water. Both materials were mixed with chromium solutions (5...
Cr(III) removal and recovery from Saccharomyces cerevisiae
Ferraz, A. I.; Tavares, M. T.; Teixeira, J. A.Heavy metal recovery from biosorbents is of major importance in the assessment of competitiveness of biosorption processes. Several desorption agents (H2SO4, HNO3, HCl, CH3COOH and EDTA) were tested for the selection of the optimal elution conditions for Cr(III) recovery from Saccharomyces cerevisiae cells. Sorption time was optimised as it plays an important role in the sorption–desorption process, being shown...
Cr (III) recovery from Saccharomyces cerevisiae by elution : a preliminary study
Ferraz, A. I.; Tavares, M. T.; Teixeira, J. A.To recover adsorbed metals from biosorbents, in order to recycle metal and reuse biomass in several adsorption/desorption cycles, elution conditions need to be optimized. The present work aimed to study the following elution parameters: eluant type and concentration (H2SO4, HNO3, HCl, CH3COOH and Na2CO3 0.1, 0.5 and 1.0 M, and EDTA 0.01, 0.05 and 0.1 M); biosorbent contact time with Cr (III) solution (15 min, 2...
The use of flocculating brewer's yeast for Cr(III) and Pb(II) removal from resi...
Ferraz, A. I.; Teixeira, J. A.The use of inexpensive biosorbents to sequester heavy metals from aqueous solutions, is one of the most promising technologies being developed to remove these toxic contaminants from wastewaters. Considering this challenge, the viability of Cr(III) and Pb(II) removal from aqueous solutions using a flocculating brewer's yeast residual biomass from a Portuguese brewing industry was studied. The influence of physi...
Trivalent chromium removal using flocculating yeasts : effect of pre-treatments...
Ferraz, A. I.; Teixeira, J. A.