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The network for distribution of water in Gothenburg amounts to 1,500 km pipes. About 60 % of the length has an average age of 50 years and is made of cast iron, 20 % is ductile iron and has an average age of 10 years. The waterlosses in 1985 were 26 % of the produced […]

Any change in water flow rate in pipes, regardless of the rate or magnitude of change, requires that the water be accelerated or decelerated from its initial flow velocity. A force is required to change the velocity of he flow and this force occurs as a hydraulic pressure transient in the pipe. The most common […]

The water network in Gothenburg has a length of 1,530 km and consists mainly of cast iron pipes. The pipes are up to 100 years old and the biggest diameters are 1,200 mm. To establish the need for reinvestments during the next 10 to 15 years, a master plan has been worked out, setting out […]

Göteborg har alltsedan 1894 Göta älv som råvattentäkt. Detta har ständigt medfört kvalitetsproblem. Vattenreningen har fått anpassas efter förutsättningarna – utvecklingsarbetet måste vara målinriktat och resultera i en snabb förbättring av vattenkvalitén. Vattnet renas genom klorering, flockning, avsättning, filtrering genom aktiverat kol (activated carbon) samt desinfektion med klor och klordioxid. Vattnet efteralkaliniseras och natriumsilikatlösning tillsättes. […]

Extensive automation and computerization of the production and distribution of the City’s supply of drinking water have been carried out in recent years. The central computer is an ASEA MasterPiece 240 with a Tesselator 8000, printers for printing occurrences and reports and hardcopies of the display printouts. The subsidiary control points consist of programmable control […]

The City of Gothenburg got its first water supply system two hundred years ago, in 1787, when water from the spring at Kallebäck was conveyed to the town centre. Later on installations at the Delsjö Lakes and at Alelyckan were built, in 1870 and 1894 respectively. At the present time the City’s supply of drinking […]

Vänern har sitt enda utlopp till havet genom Göta älv. Älven är med ett medelvattenflöde av ca 550 m3/s Sveriges vattenrikaste vattendrag. Till långt mer än 90 % av tiden är älven en utmärkt råvattentäkt. Man kan producera ett dricksvatten av god kvalitet. Genom de kontinuerliga mätningarna spåras alla större utsläpp i Göta älv. Genom […]

The Gothenburg Water and Sewage Works celebrates this year its 200th anniversary. Today Gothenburg Water and Sewage Works is one of the biggest supermarkets in the country. – delivers 200,000 m3 drinking water daily – is open around the clock – delivers the water at the customers premises through a reliable distribution system and takes […]

Drying of suspended solids and total solids samples using a household microwave oven is satisfactory for experimental work as well as a standby method for normal operational sample analysis. Results agree with analysis made using a conventional oven for influent and effluent waters, mixed liquor suspended solids, recycle solids and primary, thickened and dewatered sludges. […]

Tunisia has during the last ten years invested in an ambitious programme for waste water treatment throughout the country. The startpoint of this programme has to some extent been the situation in the tourist centres along the Mediterranean coastline during the late sixties. The overall water conservation aspect has had a very important impact on […]