KÄVEREDUKTION GENOM NITRIFIKATION I BIOLOGISKA BÄDDAR OCH EFTERDENITRIFIKATION – FÖRSÖK VID BJUVS AVLOPPSRENINGSVERK / Nitrification in Trickling Filters followed by Denitrification – Pilot Tests the Municipal Wastewaier Treatment
Trickling filters are normally considered to be difficult to use in systems designed for nitrogen removal. If the load of organic substances is low or can be reduced to a sufficiently low level, a trickling filter can however be used for nitrification and denitrification can be obtained in a succeeding denitrification process. This might be […]
RADON IN WATER – A WATER QUALITY PROBLEM?
Unhealthy indoor climate in residential buildings has been the subject of intensive research in recent years, the purpose being to find the cause and to minimize health risks. One factor that has come under attentions radon and its decay products which when inhaled may give rise to lungcancer. Radon in drinking water can be a […]
ALKALINITETSHÖJNING SOM KORROSIONSSKYDD I DRICKSVATTENLEDNINGAR. Metodik och resultat från uppföljningsarbetet i Göteborg / Increase of Alkalinity for Corrosion Prevension in Drinking Water Pipes Methods and Results from the Following-up Programin the Town of Göteborg
In order to reduce the red water problem in Göteborg, water quality was changed with respect to alkalinity and hardness. The raw water is very soft. By adding lime and carbon dioxide in the end of the water treatment process alkalinity is increased from 18 to 60 mg hydrogen carbonate/1. At the same time the […]
FÖRSÖK MED MIKROSAND SOM FLOCKHJÄLPMEDEL VID RINGSJÖVERKET / Tests with Microsand as a Coagulant Aid at the Ringsjö Plant
At the Ringsjö plant, laboratory and pilot scale tests has been carried out with a process for water treatment where the conventional process coagulation-flocculation-sedimentation is accelerated by dosing of microsand in the flocculation step. The microsand improves the sedimentation velocity of the flocs formed, while at the same time reducing the flocculation time needed. The […]
PINPOINTING AND DETERMINATION OF PYRANINE 120 % COLORANT IN LEAK WATER
The Pyranine 120 % colourant is chemically the sodium salt of 3-oxypyrenetrisulphonic acid. It is used to colour district heating water when seaking leaks into warm domestic water supplies. It colours the water a fluorescent yellowish green, and small amounts can be detected either by UV light or spectrophotometrically. It is not detrimental to health.
INACTIVATION OF BACTERIA WITH SMAC – A STABLE SOLUTION OF CHLORINE DIOXIDE IN WATER
Chlorine dioxide is a highly effective oxidising agent with powerful deodorising and bleaching properties. Its action on pathogenic micro-organisms is stronger than that of chlorine. A major drawback has, until now, been that chlorine dioxide invariably must be produced on the spot by reacting chlorine or hydrochloric acid in solution with sodium chlorite. A stable […]
PROBLEM OCH RISKER VID ANVÄNDNING AV SLAM I JORDBRUKET / Problems and Risks in Agricultural Sludge Use
Sewage sludge is in most cases not accepted as a fertilizer in agriculture. The reason is a concern for eventual environmental effects due to the presence of environmentally hazardous substances in sludge. Use of sludge in agriculture will not lead to environmental effects. A risk analysis shows this. Consequently, there are no environmentally hazardous substances […]
REJEKTVATTENBEHANDLING MED OMVÄND OSMOS / Reject Water Treatment with Reverse Osmosis
In water with high levels of nitrogen, it can be of interest to use reverse osmosis for removal of the nitrogen. This can help to reduce the total load of the wastewater treatment plant. To improve removal of nitrogen, high pressure can be used to press the nitrogen-water through a reverse osmosis membrane. The nitrogen […]
INVERKAN AV SYRE- OCH SLAMHALTEN PÅ NITRIFIKATIONSHASTIGHETEN / Influence of the Oxygen and Mixed Liquor Suspended Solids Concentration on the Nitrification Rate
Experiments were carried out at Bromma wastewater treatment plant with nitrification of reject water using SBR technics (Sequencing Batch Reactor). The studies were performed mainly in a pilot plant scale, but some complementary tests were done in a laboratory scale. The purpose was to give a basis for estimation of an appropriate oxygen concentration and […]
INTEGRATION OF ON-LINE INSTRUMENTS IN THE PRACTICAL OPERATION OF THE KLAGSHAMN WASTEWATER TREATMENT PLANT
The Klagshamn wastewater treatment plant is operated with extended BOD, phosphorus and nitrogen removal. A high and stable removal of nitrogen is reached with a process configuration based on pre-precipitation and the use of an external carbon source in a single sludge post-denitrification process. The detention time in the bioreactor is about 7 hours. The […]