It is the task of Stockholm Water and Wastewater Works to operate water supply and sewage treatment plants and to be responsible for the pipeline systems for water and wastewater in Stockholm. The city’s first waterworks was commissioned in 1861, and it is only natural to assume that many aspects of the technical systems have […]
Författare
ROLF NORBERG
Årgång
1986
Nummer
2
Utgåva
The location of the settlement that became the nucleus of today’s Stockholm was a success from the point of view of water supply. A huge boulder-ridge, which provided wells with abundant supplies of water, passed through Stadsholmen – the area now referred to as Gamla Stan. The esker enters the current city area at Norrtull […]
Författare
ANDERS CRONSTRÖM
Nyckelord (Keyword)
water supply, sewerage, municipal water and sewerage history
Årgång
1986
Nummer
2
Utgåva
Recently Stockholm’s two water treatment plants – at Norsborg and on the island of Lovö – have been completely automated and computerised. At the Lovö plant there is already a central computer with understations for steering and controlling the plant. At the end of 1985 corresponding equipment was ordered for the Norsborg plant from the […]
Författare
LARS-ERIK ERIKSSON, and ULF JORDVALL
Nyckelord (Keyword)
computerised water works in Stockholm
Årgång
1986
Nummer
2
Utgåva
Relaying water conduits and sewers in the conventional manner is an extremely expensive operation. In the central parts of Stockholm the price of relaying pipelines per metre is normally SEK 10,000. Although on the outskirts of the city the corresponding price is admittedly lower, somewhere about SEK 5,000, this too may be considered high in […]
Författare
OVE THORESSON
Årgång
1986
Nummer
2
Utgåva
The Stockholm Water and Wastewater Works have studied the needs for sewer rehabilitation to maintain an acceptable standard. The planning of the rehabilitation is being performed in three different steps. The first step was an overview in 1983 called ”The Stockholm Sewer System. Master Plan 1983”. It includes a summary of reported problems together with […]
Nyckelord (Keyword)
sewer rehabilitation, strategy, priority
Årgång
1986
Nummer
2
Utgåva
Storm water from 1,520 acres of Järvafältet north of Stockholm is treated by means of sedimentation in a 12 km long tunnel system with a volume of 275,000 m3. Storm water is thus given a long detention time before it is pumped out into Edsviken. Earlier a report has been given of one year’s pilot […]
Författare
AN HJORT, and ÅKE SIKSTRÖM
Nyckelord (Keyword)
storm water, sewage treatment, sedimentation tunnel
Årgång
1986
Nummer
2
Utgåva
Bromma Wastewater Treatment Plant, which serves the western part of Stockholm, comprises two units: the Åkeshov plant and the Nockeby plant. Today, mechanical and chemical treatment takes place at Åkeshov, accompanied by sludge treatment, while the biological treatment is carried out at the Nockeby plant. At the beginning of the 1980’s considerable conversion and extension […]
Årgång
1986
Nummer
2
Utgåva
After the Bromma sewage treatment plant was enlarged and reconstructed, the operation of the plant has been improved. Temporary requirements concerning the effluent are applied today until the final decision of the environmental authorities. The requirements are presented below together with the appropriate result from 1985. It is rather difficult to reach a complete nitrification […]
Författare
JAN HULTGREN
Nyckelord (Keyword)
nitrification, BOD-removal, phosphorus removal, sludge age
Årgång
1986
Nummer
2
Utgåva
Henriksdal Sewage Treatment Plant is designed to serve approximately 725,000 p.e., and is thus Sweden’s largest. In order to be able to meet the increasingly stringent demands for treatment and control of the different processes, preliminary studies have been conducted in joint consultation between invited suppliers the staff of the plant. The objective of the […]
Författare
ULFJORDVALL, and BENGT MALMQVIST
Årgång
1986
Nummer
2
Utgåva
Bromma sewage treatment plant for 260,000 persons has its outlet in Lake Mälaren, which also serves the greater Stockholm region as a source of drinking water. The erection of a heat pump 4 km from the plant has opened the possibility to choose another more suitable receiving water in the sea outside Stockholm. The heat […]
Författare
NILS FRIEDERICH
Nyckelord (Keyword)
water protection, tunnel boring machine
Årgång
1986
Nummer
2
Utgåva
The Stockholm archipelago has been used as a receiver for waste water for several decades. During 1968-73 the waste water treatment was improved, after which the phosphorus load significantly decreased. Since 1970 concentrations of nitrogen, phosphorus and other hydrographical parameters were measured along the eutrophication gradient from Stockholm. Quantification of cyanobacteria and chlorophyll a were […]
Författare
GUNILLA BRATTBERG
Nyckelord (Keyword)
Stockholm archipelago, brackish water, reduced eutrophication, decreased phosphorus loading, N/P ratio, limiting nutrients, cyanobacteria, chlorophyll a, nitrogen fixation.
Årgång
1986
Nummer
2
Utgåva
The working group for lake restoration was established in Stockholm in 1972. It started by examining the preconditions for restoration measures in 16 lakes and catchment areas, and went on to select seven priority lakes where measures should be taken. Since then, restoration work has proceeded, sometimes in co-operation with neighbouring municipalities. Among the various […]
Författare
BENGT EKLUND
Nyckelord (Keyword)
lake restoration, dredging
Årgång
1986
Nummer
2
Utgåva
Lake Trekanten has during the 20th century developed into a heavily eutrophicated state. The lake has served as a recipient for combined sewer overflow water. This outlet ceased in 1961. In order to prevent the internal fertilizing process which leads to enhanced primary production the sediment was treated in accordance with the ”Riplox Method”, i.e. […]
Författare
GUNILLA LINDGREN
Nyckelord (Keyword)
lake restoration, ”Riplox Method”, tap water addition, bottom water discharge
Årgång
1986
Nummer
2
Utgåva