Trial operation with biological nitrogen removal was started up on July 1, 1989, in an extended activated sludge line at the sewage treatment plant Västra Stranden in Halmstad with financial support of ”New Technics” by Swedish Environmental Protection Agency. The possibilities to increase the nitrogen removal as well as the phosphorus removal have been investigated […]
Författare
BERNT ERICSSON
Nyckelord (Keyword)
biological nitrogen removal, anoxic pre-denitrification, post-denitrification, combined pre- and post-denitrification, internal and external carbon source
Årgång
1992
Nummer
1
Utgåva
För att uppnå bättre vattenkvalitet i Laholmsbukten har bl a Halmstads kommun ålagts att under de närmaste åren genomföra miljöförbättrande åtgärder i kommunens avloppsanläggningar, främst inriktade på kvävereduktion, vid tre större avloppsreningsverk. Målet är att minska kväveutsläppen från ca 300 ton/år till ca 120 ton/år. Beräknad kostnad är ca 100 milj kr. Trots denna mycket […]
Författare
PER-OLOF HAKEMAN
Årgång
1992
Nummer
1
Utgåva
Supernatant liquid from digesting tanks is rich in ammonia. Treatment of supernatant liquid by stripping and absorption was investigated technically and economically under Danish conditions. In a pilot plant, 50 % of the ammonia was removed in one tower. The ammonia was absorbed in sulphuric acid whereby ammonium sulphate was formed. Technical and economical assessments […]
Författare
KARSTEN KROGH ANDERSEN
Nyckelord (Keyword)
nitrogen removal, stripping, sludge supernatant liquid.
Årgång
1992
Nummer
1
Utgåva
P removal and chlorination of artificial wastewater were examined by a continuous flow system. The ability of an electrolyser with carbon electrodes in adjusting pH, together with free chlorine generation, was tested. Interesting results concerning the energy consumption have been described.
Författare
OLA V GRØTERUD and LECH SMOCZYNSKI
Nyckelord (Keyword)
P removal, electrocoagulation-flotation, chlorination, pH-adjusting, continuous flow.
Årgång
1992
Nummer
1
Utgåva
This article reports on the first part of a study of biological and chemical processes in a sewer network and discusses the requirements for the biological decomposition of organic material. The consequences of smoothing flow variations, which is preferred by the sewage treatment plant, are considered. This study shows that it is theoretically possible to […]
Författare
MALIN TORELL, GILBERT SVENSSON and TORSTEN HEDBERG
Nyckelord (Keyword)
oxygen, sewer, wastewater, bioreactor
Årgång
1992
Nummer
1
Utgåva
During the autumn of 1991 laboratory tests and pilot plant studies were carried out at LTH and Sjölunda sewage treatment plant in Malmö. The aim was to investigate the influence of secondary release of phosphate in biological phosphorus removal systems. Secondary release of phosphate was observed under aerobic conditions both in the laboratory tests and […]
Författare
HANS CARLSSON
Nyckelord (Keyword)
biological phosphorus removal, secondary release
Årgång
1992
Nummer
1
Utgåva
Could future sharper demands for phosphorus removal at the wastewater treatment plants be met with a broad change-over to washing-agents without phosphorus? A full scale experiment has been conducted at the wastewater treatment plant Dagsberg in the community of Norrköping. At this plant phosphorus is removed through coagulation with ferric chloride. The water consumers in […]
Författare
ANDERS TJEDER, EVA LINDAHL, KERSTIN YGGE, and ULF ARUMSKOG,
Nyckelord (Keyword)
phosphorus, wastewater treatment plant, washing-agents without phosphorus, full scale experiment
Årgång
1992
Nummer
1
Utgåva
Today the west coast of Sweden can be flooded at a combination of strong winds from west and low pressures. In a future with climatic change and increasing precipitation and raising sea-levels a considerable increase of flood occasions can be expected. The consultant VBB VIAK has together with the municipalities of Göteborg, Kungsbacka and Halmstad […]
Författare
THOMAS JOHANSSON
Nyckelord (Keyword)
greenhouse effect, raising sea levels, increasing precipitation floodings, coast erosion, consequences.
Årgång
1992
Nummer
1
Utgåva
Most climatologists recognize that emissions of carbon dioxide, methane, and other so called greenhouse gases will result in a gradually increasing mean global temperature. The increase in temperature will, in turn, lead to rising sea levels, caused by thermal expansion of the oceans and melting of arctic and antarctic ice caps. According to researchers, a […]
Författare
HANS HANSON
Nyckelord (Keyword)
sea level rise, greenhouse effect, beach erosion, inundation
Årgång
1992
Nummer
1
Utgåva
The flow of water which leaks in through sewer manhole covers was estimated by experiments. During storms or periods of snow-melt, the volume of water leaking in through these manholes may increase the flow in the sewers substantially, resulting in an increased risk of secondary damage. The variations in water flow leaking through the key-holes […]
Författare
JÖRGEN HANÆUS
Nyckelord (Keyword)
wastewater, manhole covers
Årgång
1992
Nummer
1
Utgåva
NATURANPASSAT- DRIFTSNÅLT - Öppna filterbäddar, tre nya anläggningar / Open Low-loaded Filter Basins
Open low-loaded filter basins with drains is one example of biological methods for sewage treatment. Results from two new units, in operation since 1991, show a 95 %-reduction of total-P and BOD7 during the summer. The reduction is less during vintertime, due to lower biological activity in the filter. A study of this type of […]
Författare
SÖREN BYLUND, and TORSTEN OLOFSSON
Nyckelord (Keyword)
sewage treatment, open filter basins
Årgång
1992
Nummer
1
Utgåva
Det danska dataprogrammet EFOR för simulering av de dynamiska processerna i en aktivslamanläggning tillgängligt i svensk översättning. I programmet efterliknas driften av ett reningsverk, och driftparametrar och driftresultat kan beräknas. Effekterna av ändrade drift- och belastningsförhållanden kan således förutses med programmets hjälp. Programmet är ett redskap, som kan användas för såväl driftoptimering som för analyser […]
Författare
SÖREN EJHED
Årgång
1992
Nummer
1
Utgåva
The quality of drinking water must be monitored continuously. Before a raw water supply is taken into use its quality must be checked very carefully, and more detailed examinations must then be made at later stages, e.g. after five years. The larger examinations in effect form a continuous monitoring programme and can reveal some astonishing […]
Författare
ANNELI SKRÖKKI
Nyckelord (Keyword)
drinking water, water quality, water, ground water, surface water, water analyses
Årgång
1992
Nummer
1
Utgåva