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

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Presentation on theme: "Sewage Treatment Package Plant Technology in Norway Paul Gaydon 17 March 2008."— Presentation transcript:

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 Conventional Sequencing batch reactor 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

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14 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

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

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

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33 Short Drops – Eish Madoda!  Mainly for holiday cottages  Not for the faint hearted

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