Activated Sludge Microorganisms - Discusses and illustrates the organisms in sludge, and what can be learned by microscopic analysis of biological treatment systems for wastewater. Topics run from industrial pretreatment to sludge disposal. Flush Gordon's Wastewater Page - Introduction to water pollution, wastewater treatment, and water analysis. Useful as an educational resource, with diagrams and many links. Irepolia Environmental studies and analysis center - Conducts research and technology development on wastewater treatment methods.
Site is in English and French.
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