Tanneries
Mostrando 13-23 de 23 artigos, teses e dissertações.
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13. Trace elements in waters, sediments, and soils of Rio das Mortes Basin, Minas Gerais. / Elementos-traÃo em Ãguas, sedimentos e solos da Bacia do Rio das Mortes, Minas Gerais
The watershed of the Rio das Mortes is a region in the State of Minas Gerais characterized by several mining, iron works, industries, and tanneries. The aims of this study were: to establish natural background contents of trace elements for soils and sediments; and to identify sites contaminated by trace elements. In order to detect contamination spots, it w
Publicado em: 2006
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14. O cromo na indústria de curtumes de Mato Grosso do Sul, Brasil: Aspectos ecológicos / Chromium in the tanning industry in Mato Grosso do Sul, Brazil: ecological issues
Todas as formas de cromo podem ser tóxicas, mas o cromo VI na forma de cromatos é mais perigoso do que o cromo III. Conseqüentemente, todos os tipos de cromo e seus compostos são de grande importância nos estudos ambientais, uma vez que, em concentrações excessivas, o elemento é prejudicial à saúde, podendo estar relacionado com a patogenia de uma
Publicado em: 2006
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15. Tanneries: from waste to sustainability
O principal objetivo deste trabalho é a busca de uma solução mais eficiente e ambientalmente correta para a indústria do curtimento do couro (curtumes). Os curtumes são indústrias altamente consumidoras de águas e enfrentam sérios problemas com a geração de efluentes. Neste artigo, avaliaram-se alternativas de reuso da água de processo, as quais f
Brazilian Archives of Biology and Technology. Publicado em: 2005-06
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16. Estudo da extração de cromo hexavalente, pela técnica de membranas líquidas surfatantes, visando o tratamento de efluentes líquidos de curtumes
In the present work, it has been proposed to study the extraction of dichromate ions from an external phase (formed by potassium dichromate solution), using the surfactant liquid membrane technique (S.L.M). The main goal of this work is to reduce these species content in tanneries effluents. The following operational variables has been investigated: extracta
Publicado em: 2005
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17. Estudo da remoção dos ions cromo(III) e cobre(II) em colunas de leito fixo pela alga marinha Sargassum sp
The increasing concern with the environment question and the severity of the legislation in discarding industrial and domestic effuents containing metals has motivated the search for new technologies of recovery and removal of metals. The metal removal with biomass of microorganisms has been investigated as an alternative to the traditional methods of metal
Publicado em: 2001
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18. Novel Keratinase from Bacillus subtilis S14 Exhibiting Remarkable Dehairing Capabilities
We report the isolation of a keratinolytic-producing Bacillus subtilis strain and the characterization of the exceptional dehairing properties of its subtilisin-like keratinase. This enzyme can be an alternative to sodium sulfide, the major pollutant from tanneries, and may completely replace it. Its unique nonactivity upon collagen enhances its industrial p
American Society for Microbiology.
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19. Search for benzidine and its metabolites in urine of workers weighing benzidine-derived dyes.
Urinary benzidine and conjugates have been used to assess the extent of occupational exposure to benzidine-based azo dyes. The aim of the present study was to investigate the presence of benzidine and its conjugates in the urine of workers exposed to benzidine-derived dyes. Urine samples were collected from 29 workers in three textile dyehouses, two tannerie
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20. Cancer mortality among workers in the Tuscan tanning industry.
The mortality of 2926 male workers at the tanneries in the "leather area" of Tuscany was examined from 1950 to 1983 comparing it with the national mortality. Cancer mortality was of particular concern because of the many chemicals known to be definite or suspected carcinogens used in the tanning cycle, in particular chromate pigments, benzidine based dyes, f
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21. Cancer incidence and mortality among Swedish leather tanners.
OBJECTIVES--The aim was to study the incidence of cancer among Swedish leather tanners. METHODS--A cohort of 2026 subjects who had been employed for at least one year between 1900 and 1989 in three Swedish leather tanneries, was established. The cancer incidence and mortality patterns were assessed for the periods 1958-89 and 1952-89 respectively, and cause-
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22. Hair chromium as an index of chromium exposure of tannery workers.
The use of hair chromium (Cr) concentrations as an index of Cr exposure of tannery workers was investigated. As has been shown earlier, Cr from Cr III compounds used in the leather tanning industry is absorbed because concentrations of Cr in serum and urine of tannery workers are significantly increased compared with corresponding concentrations for unexpose
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23. Cancer incidence and specific occupational exposures in the Swedish leather tanning industry: a cohort based case-control study.
OBJECTIVE--To study the effect on the incidence of cancer of exposure to chemicals handled in the leather tanning industry. MATERIALS AND METHODS--A case-control study was performed within a cohort of 2487 workers employed for at least six months during the period 1900-89 in three Swedish leather tanneries. 68 cancer cases (lung, stomach, bladder, kidney, na