Molecular weight distributions of organic halogens in bleached kraft pulp mill effluents

Article Abstract:

Chlorine bleaching of paper pulp results in large amounts of organic halogen compounds that are not currently recyclable nor fully recoverable from the mill effluent. Weight distributions of organic halogens were studied to understand the environmental fate of these compounds. Low molecular weight compounds have been known to accumulate in aquatic organisms, while high molecular weight compounds, thought to comprise most of the organic halogens in the effluent, were usually biologically inert. The tests indicated that the molecular weights were smaller than previously believed.

Pulp mills, Waste management, Sulfate pulping process, Sulfate pulping, Wood-pulp, Wood pulp

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Effect of biological treatment on halogenated organics in bleached kraft pulp mill effluents studied by molecular weight distribution analysis

Article Abstract:

The importance of adsorption and solvent solubility properties for the biodegrability of waste water organochlorines is discussed. The molecular weight distribution, solubility and absorptivity of the organochlorine compounds present in the aqueous phase of the bleached kraft pulp mill effluent were measured during the course of the biotreatment. Different recalcitrance towards biotreatment was established from the organochlorine compounds.

Analysis, Halocarbons, Molecular weights

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Biological dechlorination of model organochlorine compounds in bleached kraft mill effluents

Article Abstract:

Organochlorine compounds are environmental pollutants produced by the pulp and paper industry. They are collectively known as adsorbable organic halogen and are removed from pulp and paper mill effluents through biological treatment methods such as dechlorination. The biological dechlorination of organochlorine compounds in bleached kraft mill effluents is demonstrated using three monomeric model compounds and a dimeric model compound.

Models, Paper industry, Biodegradation, Organochlorine compounds, Organic chlorine compounds, Paper mills

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