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Toxicity of effluents from sulphite pulping operations practicing recovery and biological treatment

Author: Beak Consultants.; Canada. Water Pollution Control Directorate. Abatement and Compliance Branch.
Publisher: Ottawa, Ont. : The Directorate, ©1979.
Series: Economic and technical review report EPS, 3-WP-79-9.
Edition/Format:   Print book : National government publication : EnglishView all editions and formats
Summary:
This study was conducted to determine whether conventional secondary biological treatment detoxifies sulphite pulp mill effluents. Seven sulphite pulp mills, varying in pulping base, wood species, type of treatment and recovery system and geographical location were studied. All mills were located in the United States and practiced some form of chemical recovery and biological treatment (aerated lagoons or activated  Read more...
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Additional Physical Format: Online version:
Toxicity of effluents from sulphite pulping operations practicing recovery and biological treatment.
Ottawa, Ont. : The Directorate, ©1979
(OCoLC)1019675228
Material Type: Government publication, National government publication
Document Type: Book
All Authors / Contributors: Beak Consultants.; Canada. Water Pollution Control Directorate. Abatement and Compliance Branch.
ISBN: 0662107101 9780662107101
OCLC Number: 9274215
Language Note: Includes abstract in French.
Notes: "October 1979."
Abstract also in French.
Description: v, 51 pages ; 28 cm.
Series Title: Economic and technical review report EPS, 3-WP-79-9.
Responsibility: by Beak Consultants Limited ; for the Abatement and Compliance Branch, Water Pollution Control Directorate, Environmental Protection Service, Environment Canada.

Abstract:

This study was conducted to determine whether conventional secondary biological treatment detoxifies sulphite pulp mill effluents. Seven sulphite pulp mills, varying in pulping base, wood species, type of treatment and recovery system and geographical location were studied. All mills were located in the United States and practiced some form of chemical recovery and biological treatment (aerated lagoons or activated sludge). Samples of mill effluents before and after biological treatment were collected four times over six months. Standard 96-hour static bioassays using rainbow trout (Salmo gairdneri) determined the LC50 value of each sample. Acute lethality was defined by a compliance standard of LC50=100%. Other routine analyses such as pH, biochemical and chemical oxygen demand, ammonia and total suspended solids were also conducted.

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