EXPERIMENTELL UNDERSÖKNING AV NITRIFIKATIONSPROCESSEN MED ANVÄNDNING AV MULTIVARIAT METODIK / Experimental Investigation of Nitrification Process by Use of Multivariate Method
Nitrification of reject water with SBR technics has been studied at Bromma sewage treatment plant in Stockholm. At the beginning of 1993 an investigation of the nitrification by use of multivariate method was carried out. Experiments showed that the nitrification rate is very strong depending on the oxygen content in water. Moreover the experiment proved […]
NITRIFIKATIONSHÄMNING VID ÖRESUNDSVERKET I HELSINGBORG / Inhibition of the Nitrification Process at Öresundsverket in Helsingborg
The nitrification process at Öresundsverket in Helsingborg was, during a test period of twelve weeks, effected by inhibiting substances. The inhibition was found both in laboratory tests and in full scale at the treatment plant. The laboratory tests performed are based on week samples. Despite dilution of a potential inhibitor in a week sample, two […]
KRETSLOPPET OCH KARAKTERISERING AV AVLOPPSVATTENS MILJÖFARLIGHET / The Recycling and Characterization of Waste Water
Characterization is a study of the effect of waste water or a chemical on the environment. The study is carried out by biological and chemical analytical methods. Characterization of waste water plays an important role in protecting the environment and working towards a society of recycling. In this paper different characterization models for waste water […]
WASTE WATER REUSE FOR AGRICULTURAL PURPOSES IN MINDELO, CAPE VERDE
Water is scarce in Cape Verde. In Mindelo almost all fresh water is produced by desalination of sea water because of lack of fresh water. In this perspective reuse of waste water for agricultural purposes is a very interesting alternative. Mindelo is also the only city in Cape Verde with an existing infrastructure regarding the […]
HYDROCHEMICAL FACTORS AFFECTING THE NEUTRALIZATION DEMAND IN ACID SULPHATE WATERS
Many rivers and estuaries in Western Finland are subjected to highly acidic runoff from acid sulphate (AS) soils in their catchments. Acidic inflows, clearly exceeding the buffering capacity of the recipients, are common during most spring and autumn floods. AS soil acidity causes serious damage to the fisheries m common in the affected area. The […]
FYTOFLAGELLATEN PRYMNESIUM PARVUM- OVERSIKT OVER TOKSIKOLOGISK KUNNSKAP / The Phytoflagellate Prymnesium parvum- Account of Toxicological Knowledge
The phytoflagellate Prymnesium parvum Carter, and probably Prymnesium patellifera Green & Hibberd, belong to the toxinproducing algae in the Scandinavian coastal waters. Only particular physiological strains of the species are toxigenic. The toxic properties of P. parvum are attributed to a group of chemical compounds having similar composition, but different toxic effects. The toxic principle […]
ANVÄNDNING AV SYRGAS FÖR FÖRBÄTTRAD NITRIFIKATION VID KALLA TEMPERATURER Fullskaleförsök vid Slottshagens reningsverk i Norrköping vintern 1991-92 / The Use of Oxygen Gas for Improved Nitrification at Low Temperatures Full scale experiments at Slottshagen WWTP in Norrköping during the winter 1991-92
From February to April in 1992, oxygen gas was introduced in one of six aeration basins at the Slottshagen waste water treatment plant in Norrköping, Sweden. During this period the nitrification activity is usually very low and the oxygen levels in a large part of the aeration basins are below 1 mg/l. As oxygen was […]
BIOLOGISK KVÄVE- OCH FOSFORAVSKILJNING UNDER TVÅ ÅRS DRIFT I FULL SKALA VID SÄRDALS AVLOPPSRENINGSVERK / Biological Nitrogen and Phosphorus Removal during Two Years of Full Scale Operation at Särdals Wastewater Treatment Plant
In the wastewater plant at Särdal a biological treatment of phosphorus and nitrogen has been working successfully since 1990. At optimal conditions in spring and autumn of 1991 and 1992 the discharges were 0.3 mg/l of phosphorus and 6 mg/l of nitrogen. The removal of phosphorus was 93 % and of nitrogen 78 %. Summer […]
FISKDÖD ORSAKAD AV PRYMNESIUM PARVUM, Fish Mortality Caused by Prymnesium parvum
A bloom of Prymnesium parvum Carter (Prymnesiophyceae) caused a considerable fish death in the Bay of Holminge, ca 12 km NO Stockholm, Sweden, during May and June 1991. The bay is a shallow coastal lake, influenced by brackish water from the Baltic Sea (Kyrkfjärden). During spring 1992 Prymnesium also invaded the Kyrkfjärden area. A maximum […]
BASE WASA – ANTARCTIC WASTEWATER TREATMENT AND ZERO DISCHARGE
Mechanical and biological wastewater treatment was evaluated in a full scale test during the 1991-92 Wasa base expedition period. The base was erected on a nunatakk in the Norwegian Antarctic sector and housed 10-20 people. The results indicated that wastewater organics were reduced by a total of 70 %. Small changes in other constituents were […]