Tratamento de efluente textil pelo sistema de lodos ativados em batelada com adição de carvão ativado em po

AUTOR(ES)

Luiz Carlos da Silva Porto

DATA DE PUBLICAÇÃO

2002

RESUMO

The treatment of textile wastewater is complex because it is highly variable and has xenobiotic compounds. Consequently, not only stringent environmental regulations but also society and market pressures result in an enormous challenge to textile industries, mainly small and middle-sized ones. The aim of this research was to investigate the use of sequencing batch reactor with addition of powdered activated carbon (SBR/P AC), which is an incipient subject in Brazil, to treatment of wastewater from a textile dyeing and finishing company, making a comparison with the conventional system (SBR). Raw industrial effluent had average DOC = 177,21 :t 50,24 mg/L and average color = 190 :t 94 ADMI units. At Phase 1 the best P AC for addition to biological system was found by adsorption tests. At Phase 2 six reactors with four liters each were operated with 24 hours of total cycle, one working as control and five working with concentration varying from 250 to 2.000 mg P AC/L. At Phase 3 two reactors were operated, at three cycle daily, one without PAC and another with 1.000 mg PAC/L. At Phase 4 PAC was additioned to the SBR plant of a textile mill. The results showed that, compared to the SBR, SBR/P AC presented higher DOC removal (difference up to 6,56%), higher color removal (difference up to 46,63% at treated wastewater), higher nitrification of waste water (difference of 43,14%), higher biomass concentration in reactor (difference up to 43,11 %) and higher stability to influent organic load variation. SBR/P AC operation cost , refered only to P AC addition, was 0,03 US$/m3 treated (as Ju1y 2001). Therefore, SBR/PAC is an alternative to improve biological treatment of textile wastewater, even in small and middle-sized companies

ASSUNTO(S)

aguas residuais - purificação - processo de lodo ativado aguas residuais sewage industria textil carbono ativado textile industry sewage

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