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Sewage Treatment Package Plant Technology in Norway

Sewage Treatment Package Plant Technology in Norway. Paul Gaydon 17 March 2008. Interesting Features. Introduced to reduce P loading to inland waters Problem due to excessive P fertilising All plants EU accredited – but self-accreditation

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Sewage Treatment Package Plant Technology in Norway

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  1. Sewage Treatment Package Plant Technology in Norway Paul Gaydon 17 March 2008

  2. Interesting Features • Introduced to reduce P loading to inland waters • Problem due to excessive P fertilising • All plants EU accredited – but self-accreditation • Very cold climate – no nitrification, freezing problems • Many remote holiday cabins • Cities on coast – sea outfalls (30m?) • Sophisticated society – Maslov’s hierarchy of needs

  3. Interesting Features (cont) • Huge emphasis on environment • Affluent society • Often share facilities between houses • Some systems very primitive • Chlorination taboo!! • Very poor knowledge of sewage treatment

  4. Idiots Guide to Effluent Analysis • Use your senses – limited to smell and visual • Smell – H2S, ammonia • Visual – solids – COD (settling problems) • Phosphate – Eish – testing kit

  5. Technologies • Chemical treatment • Rotating Bio-Contactor • Activated sludge • Conventional • Sequencing batch reactor

  6. Chemical Treatment • Small village • Large metal salt dose to precipitate solids and phosphate • No effect on ammonia • Solids dried with centrifuge • High energy inputs • Sludge spread in forests

  7. Activated Sludge - Conventional • Two houses or BnB • Pre-treatment by septic tank • Stainless steel underground – extremely expensive • Accessibility problem • Effluent high in ammonia, phosphate and some solids

  8. Activated Sludge - SBR • Situated within a house structure for a hamlet • Extremely complex system – unnecessarily so • Highly automated • Possible high maintenance due to complexity

  9. Rotating Bio-Contactor • Integrated with septic tank – compact design • High in solids – COD • Cloudy effluent – ammonia • Durability of fibreglass with freeze-thaw action

  10. Short Drops – Eish Madoda! • Mainly for holiday cottages • Not for the faint hearted

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