COD fractionation and biological treatability of mixed industrial wastewaters.
J Environ Manage
; 113: 71-7, 2012 Dec 30.
Article
em En
| MEDLINE
| ID: mdl-22996003
ABSTRACT
This study was conducted at a centralized wastewater treatment plant that receives discharges from nearly 160 industries. The chemical oxygen demand (COD) was fractionated for two objectives:
delineation of the limits of the activated sludge process being used at the plant, and evaluation of the potential environmental impact of the treated effluent. Physico-chemical analyses, respirometric and biodegradation tests, as well as COD fractionation were carried out. Molasses-wastewaters were determined to be the major contribution to the plant. The influent was dark brown in color, with a relatively high content of both organics (2503 mg/L COD) and salts (5459 µS/cm conductivity), but a low biochemical oxygen demand (568 mg/L BOD(5)) and BOD(5)/COD ratio (0.24). The degradability of the organics was limited by the high content of inert soluble COD (S(I)). The COD fractionation pattern was 40-20-40% for S(I), X(I) (inerts) and S(H) (soluble hydrolyzable), respectively. More than 90% BOD(5) removal was obtained, which was sufficient for the plant to meet the national Standards. However, the effluent discharged into the river was intensely colored and polluted (>1000 mg/L COD, >5000 µS/cm), emphasizing the need for legislation regulating COD, color and salinity, and for upgraded treatment methods worldwide for molasses wastewaters.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Análise da Demanda Biológica de Oxigênio
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Águas Residuárias
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Resíduos Industriais
Tipo de estudo:
Guideline
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article