ÖVERVAKNING OCH STYRNING AV PRODUKTION OCH DISTRIBUTION AV DRICKSVATTEN / Supervision and Control of Production and Distribution
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 […]
GÖTEBORGS VATTENPRODUKTION 1987 / Gothenburg’s Water Supply
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 […]
GÖTA ÄLV – RÅVATTENTÄKT / Göta Älv – Raw Water Supply
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 […]
VA-FÖRSÖRJNING – EN LIVSVIKTIG VERKSAMHET I STÄNDIG FÖRÄNDRING / Water Supply – an Activity in Continuous Change
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 […]
UTVÄRDERING AV HUSHÅLLSMIKROVÅGSUGN FÖR TORKNING AV PROVER VID BESTÄMNING AV SUSPENDERADE ÄMNEN OCH TORRSUBSTANS, Evaluation of a Household Microwave Oven for Drying Suspended Solids and Total Solids Samples
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. […]
VATTENVÅRD I TUNISIEN – ERFARENHETER FRÅN ETT DECENNIUMS UPPBYGGNAD AV AVLOPPSRENING / Water Environment Planning in Tunisia – Experiences from a Decade of Municipal Wastewater Treatment
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 […]
WATER QUALITY IN PRIVATE WELLS IN THE DISTRICT OF KRISTIANSTAD – STATUS AND VARIATION
The district of Kristianstad has about 70,000 inhabitants. Approximately 20,000 are served with water from 8,000 wells used by one household each. They include 4,000 dug wells, 3,500 drilled wells and 500 driven yells. About 2,000 of the wells cannot meet the bacteria density standard and 3,000 wells have a nitrate concentration >10 mg/1 NO3-N […]
EN PROGNOSMODELL FÖR MÄNGDEN LÖST ORGANISKT MATERIAL I VÄNERN / A Forecast Model for Soluble Organic Matter in Lake Vänern
The loading of organic matter to Vänern peaked during the mid-1960’s. Restructing and improvements of treatment procedures within the paper and pulp industries have resulted in a decrease which later resulted in a reduction of the permanganate numbers and an increase of Secchi depth. In order to evaluate later developments, the changes of KMn04-numbers have […]
VIVASSEN – VATTENUTBYTE, SYRE- OCH NÄRSALTSFÖRHÅLLANDEN / The Embayment of Vivassen – Water Exchange, Oxygen and Nutrients
The Vivassen is a small embayment (1 km2) on the Swedish east coast with a narrow sound connecting it to the Baltic archipelago. We have measured the supply of nitrogen and phosphorus from waste disposal and from runoff and compared those sources with the supply of nutrients from the Baltic dividing between spring bloom nutrient […]
UPPLÖSNING AV KALKSTEN I MARK – VÅTMARKSKALKNING / Dissolution of Limestone in Soils-Wetland Liming
Liming of discharge areas of groundwater aquifers is one method to increase the alkalinity in surface waters. A mathematical model for the chemical effects of liming upon the soil, the soil solution and the run-off was formulated. The model includes simultaneous dissolution of limestone, cation-exchange and leaching of dissolved components. The model has been tested […]