FALKENBERGS KOMMUN – OKOME AVLOPPSRENINGSVERK Kvävereduktion i biologiska dammar
Okome samhälle har ca 180 personer vilka är anslutna till reningsanläggningen som utgöres av 2 st biologiska dammar. Dammarna anlades i mitten på sextiotalet och drevs konventionellt fram till 1986. Reningsanläggningen kompletterades sedan med kalkfällning och kalksilon med doseringsutrustning placerades mellan första och andra dammen. Reningsresultaten för åren 1987-1990 visar att anläggningen har fungerat bra. […]
RESTORATION OF LOWLAND STREAMS: THE BUILDING BLOCKMODEL
In many agricultural areas the small streams have been reduced to drainage ditches. This not only has destroyed important natural habitat but has reduced the self cleaning and nutrient reduction ability of agricultural streams. There is now much discussion about how this trend can be reversed in a practical and cost effective way without disrupting […]
PROVTAGNINGSMETODIK VID BESTÄMNING AV JÄRNKONCENTRATION I DRICKSVATTEN / Sampling Methods for Determination of Iron Concentration in Drinking Water
High concentrations of iron in drinking water, redwater, is a problem in some parts of Gothenburg. Iron concentration is determined in redwater areas by analysis of samples taken out of hydrants. Unfortunately it is very difficult to compare results from different samples and to find tendencies as different methods are used. During the investigation many […]
BELASTNINGSMODELLER FÖR NÄRSALTER FÖR BEDÖMNING AV FISKODLINGARS MILJÖPÅVERKAN I MARIN MILJÖ / Nutrient Loading Models for the Assessment of Environmental Effects of Marine Fish Farms
The aim of this paper is to present and discuss some results from the project ”The Coast As a Natural Resource”. The overall aim has been to attempt to develop new scientific criteria, methods and models for the planning of coastal waters. The sensitivity of different coastal areas to nutrient loading (nitrogen and phosphorus) from […]
PROJEKT KALKNING – KVICKSILVER – CESIUM – en sammanfattning av projektet i Örebro län / PROJECT LIMING – MERCURY – CESIUM – a summary of the project in the Örebro county, Sweden
This project is a summary of the work carried out within the project Liming – Mercury – Cesium in the Örebro county. The basic question is: How is it possible to reduce the mercury and cesium content in fish and the threat of ”blacklisting” presently acute for about ten thousand Swedish lakes? What measures could […]
KOLKÄLLA UR SLAM FÖR BIOLOGISK DENITRIFIKATION, Carbon Source by Anaerobic Sludge Treatment for Biological Denitrification
The introduction of biological nitrogen removal at many sewage treatment plants in Sweden, particularly those located at coastal regions up to Stockholm archipelagio in the east, is now proceeding primarily by plant trial operation. The deficit of an easily biodegradable carbon source for anoxic denitrification and the cold winter climate are the most characteristic problems […]
NEDBRYTNING AV UREA I ET NITRIFISERENDE DYKKET BIOLOGISK FILTER I ET FISKEOPPDRETTSKAR MED KARINTERN RESIRKULERING (SYSTEM BIOFISH) / Removal of Urea in a Nitrifying, Recirculating and Submerged Biological Filter Located in a Fish Tank (The Biofish System)
In a fish tank with a build-in upstreams aerobic biological filter (The BIOFISH System), batch-experiments were made to study whether hydrolysis of urea is a limiting step in the conversion of urea to nitrate. Based on frequent grab sampling and analysis of the different forms of nitrogen in the water, calculations were made for the […]
JORDBRUKSDRIFT OCH KVÄVELÄCKAGE I SÖDRA HALLAND / Agriculture and Nitrogen Leakage in Southern Halland
The southern part of Halland in south-west Sweden constitutes an area with great risk for nitrogen leakage from agricultural land. This is due to high precipitation, sandy soils and intense animal and crop production. The nitrogen transport in the agricultural rivers Trönningeån and Smedjeån is high but has decreased significantly during the 1980s. Decreasing transport […]
BIOLOGISK KVÄVEREDUKTION FÖR KOMMUNALA OCH INDUSTRIELLA AVLOPPSVATTEN / Biological Nitrogen Reduction in Sewage and Industrial Wastewater
The demand for more efficient wastewater treatment in Sweden and Denmark has increased lately. The demand for nitrogen removal has especially increased in Sweden, where this means that nitrogen has to be removed with 50 % to begin with and 75 % for some areas later on. In Denmark the general requirement is a maximum […]
NITRIFICATION AND ITS SUPPRESSION IN THE BOD TEST
This study is concerned with nitrification in the BOD test and how to suppress it. The results show that a significant proportion of the BOD value of biologically treated municipal effluents is due to nitrification and that it can be suppressed by the addition of allylthiourea (ATU). A national survey comprising 298 samples from 35 […]