SciELO - Scientific Electronic Library Online

 
vol.14 número1DEALING WITH INCONSISTENT QUADRATIC PROGRAMS IN A SQP BASED ALGORITHMINFLUENCE OF pH, TEMPERATURE AND DISSOLVED OXYGEN CONCENTRATION ON THE PRODUCTION OF GLUCOSE 6-PHOSPHATE DEHYDROGENASE AND INVERTASE BY Saccharomyces cerevisiae índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Brazilian Journal of Chemical Engineering

versão impressa ISSN 0104-6632

Resumo

BIOFILM FORMATION ON BRASS COUPONS EXPOSED TO COOLING WATER. Braz. J. Chem. Eng. [online]. 1997, vol.14, n.1 ISSN 0104-6632.  http://dx.doi.org/10.1590/S0104-66321997000100007.

Brass coupons were installed in a bypass in an industrial cooling water that uses seawater. The metal samples were removed at 15, 30, 45, and 60-day intervals for quantitative and qualitative analyses of the microorganisms constituting the biofilm adhering to the metal surface. After 15 days of exposure, a biofilm had already been generated which contained aerobic and anaerobic microorganisms. The aerobic bacteria were the most stable in relation to quantity, followed by the fungi. Anaerobic microorganisms, as well as sulfate-reducing bacteria, were present at higher concentrations. Variations in sulfide contents were observed in the biofilm. Analysis by scanning electron microscopy revealed microalgae, bacteria, filaments, and corrosion products as constituents of the biofilm adhering to the surface of the metal. After the biofilms were scraped off the brass samples, evidence of corrosion was observed on the metal surface

Palavras-chave : Biofilms; brass; cooling water; seawater.

        · texto em Inglês