Evaluation of sorption isotherms for selected azo dyes as predictors of fate in an activated sludge wastewater treatment process

Conference · Thu Sep 01 04:00:00 EDT 1988 · Preprints of Papers Presented at National Meeting, Division of Water, Air and Waste Chemistry, American Chemical Society; (USA)

OSTI ID:7267183

Lieberman, R J ^[1]; Shaul, G M; Dempsey, C R; Dostal, K A ^[2]

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1. Univ. of Cincinnati, OH (USA)
2. Environmental Protection Agency, Cincinnati, OH (USA)

Azo dyes are of concern to environmental regulators because of the widespread production and utilization of these compounds as well as their potential adverse impact to environmental and human health. The typical line of defense between a dye-laden effluent and a receiving stream, river or other body of water is an aerobic biological wastewater treatment plant; hence the need for determining the fate of azo dyes undergoing such treatment. Activated sludge pilot plant studies conducted to determine the fate of several azo dyes have been reported in the literature. However, such experiments are time consuming, costly, and require facilities and expertise outside the realm of the dye industry. Therefore, laboratory batch sorption studies have been evaluated for their efficacy as predictors of fate for selected azo dyes, since sorption is considered to be a key removal mechanism for most dyes in aerobic biological systems. The four sorbents utilized in this study were activated sludge solids, powdered activated carbon, XAD-2 polymeric resin and XAD-7 polymeric resin. The sorbates utilized in this study were water-soluble azo dyes of the acid and direct categories. Over forty compounds were investigated with a little over half of them being acid dyes. Sorption data were applied to three widely accepted sorption models: Freundlich, Langmuir and the Brunauer-Emmett-Teller (BET) isotherm equations. Potential relationships between the various sorbate-sorbent systems and the three sorption models were investigated.

• OSTI ID: 7267183
• Report Number(s): CONF-8909234--
• Conference Information: Journal Name: Preprints of Papers Presented at National Meeting, Division of Water, Air and Waste Chemistry, American Chemical Society; (USA) Journal Volume: 28:2
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
ACTIVATED CARBON
ACTIVATED SLUDGE PROCESS
ADSORBENTS
ADSORPTION ISOTHERMS
AZO COMPOUNDS
AZO DYES
CARBON
DYES
EFFICIENCY
ELEMENTS
HYDROGEN COMPOUNDS
ISOTHERMS
LIQUID WASTES
MANAGEMENT
MATHEMATICAL MODELS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLLUTION
POLYMERS
PROCESSING
RESINS
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER
WASTES
WATER
WATER POLLUTION