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Texto completo SciELO Brasil
Texto completo
Id: biblio-889215
Autor: Singh, Utkarsh; Arora, Naveen Kumar; Sachan, Preeti.
Título: Simultaneous biodegradation of phenol and cyanide present in coke-oven effluent using immobilized Pseudomonas putida and Pseudomonas stutzeri
Fonte: Braz. j. microbiol;49(1):38-44, Jan.-Mar. 2018. tab, graf.
Idioma: en.
Resumo: ABSTRACT Discharge of coke-oven wastewater to the environment may cause severe contamination to it and also threaten the flora and fauna, including human beings. Hence before dumping it is necessary to treat this dangerous effluent in order to minimize the damage to the environment. Conventional technologies have inherent drawbacks however, biological treatment is an advantageous alternative method. In the present study, bacteria were isolated from the soil collected from the sites contaminated by coke-oven effluent rich in phenol and cyanide. Nucleotides sequence alignment and phylogenetic analysis showed the identity of the selected phenol and cyanide degrading isolates NAUN-16 and NAUN-1B as Pseudomonas putida and Pseudomonas stutzeri, respectively. These two isolates tolerated phenol up to 1800 mg L-1 and cyanide up to 340 mg L-1 concentrations. The isolates were immobilized on activated charcoal, saw dust and fly ash. The effluent was passed through the column packed with immobilized cells with a flow rate of 5 mL min-1. The isolates showed degradation of phenol up to 80.5% and cyanide up to 80.6% and also had the ability to reduce biological oxygen demand, chemical oxygen demand and lower the pH of effluent from alkaline to near neutral. The study suggests the utilization of such potential bacterial strains in treating industrial effluent containing phenol and cyanide, before being thrown in any ecosystem.
Descritores: Cianetos/metabolismo
Pseudomonas putida/metabolismo
Pseudomonas stutzeri/metabolismo
Eliminação de Resíduos Líquidos/métodos
Águas Residuais/microbiologia
-Biodegradação Ambiental
Células Imobilizadas/classificação
Células Imobilizadas/metabolismo
Resíduos Industriais/análise
Pseudomonas putida/classificação
Pseudomonas putida/genética
Pseudomonas putida/isolamento & purificação
Pseudomonas stutzeri/classificação
Pseudomonas stutzeri/genética
Pseudomonas stutzeri/isolamento & purificação
Águas Residuais/análise
Tipo de Publ: Estudos de Avaliação
Responsável: BR1.1 - BIREME

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Texto completo SciELO Chile
Texto completo
Id: lil-495805
Autor: Iglesias A, Verónica; Burgos D, Soledad; Marchetti P, Nella; Silva Z, Claudio; Pino Z, Paulina.
Título: Nivel de níquel urinario en niños residentes en ciudades cercanas a megafuentes / Urinary nickel in children exposed to petcoke pollution
Fonte: Rev. méd. Chile;136(8):1039-1046, ago. 2008. ilus, tab.
Idioma: es.
Resumo: Background: Petcoke is a remmant of the oil refiningprocess that contains Ni and other heavy metáis. Undesired human exposure to these compounds may result from petcoke combustión in plants located in the vicinity ofthe cities. Aim: To compare levéis of urinary Ni in schoolchildren residing in cities exposed and not exposed to petcoke pollution. Material and methods: A cross sectional study was done in schoolchildren aged 7 to 8 years oíd in two cities in northern Chile: Mejillones (n = 59), near to a petcoke plant and Tocopilla (n = 56) as the reference city. First, morning urinary samples were collected and urinary Ni was determined by Atomic Absorption Spectrometry. Socioeconomic and environmental exposure information of families was obtained applying a questionnaire to parents. Múltiple linear regression was performed to identify other variables that may explain urinary Ni differences among the cities. Results: Median level of Ni was higher in Mejillones (4.9 fig/L) than in Tocopilla (3.9 fig/L). Residing in the exposed city was the most important explaining factor (B = 0.26; IC 0.107 - 0.428). Additionally years of residency was associated with urinary Ni (B = 0.03; IC 0.004 - 0.060). Conclusions: Urinary Ni in schoolchildren is higher in the city exposed to petcoke emissions. The difference does not imply that there are concrete hazards for the population s health. However, it warns about the existence of a higher exposure in places where petcoke is used.
Descritores: Coque/toxicidade
Saúde Ambiental
Poluentes Ambientais/urina
Poluição Ambiental/efeitos adversos
Material Particulado/química
Estudos Transversais
Inquéritos Epidemiológicos
Fatores de Risco
Fatores Socioeconômicos
Limites: Criança
Seres Humanos
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME

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