EN KRITISK GENOMGÅNG AV METODER OCH BEDÖMNINGSUNDERLAG FÖR ÖVERGÖDNINGSEFFEKTER AV FISKODLINGAR I SJÖAR – SAMMANSTÄLLNING OCH ÖVERSIKT / A Critical Review of Methods to Calculate Eutrophication Effects of Emissions from Fish Farms in Lakes
This works presents a critical review of existing models to evaluate eutrophication consequences related ro emissions from fish cage farms in lakes. Existing models ofthe Vollenweider-type, i.e., models based only on formation on tributary input of toial-P and theoretical lake water retention lime (or related lake morphometrical facrors) cannot be used to predict and/or evaluate […]
AEROB TERMOFIL SLAMSTABILISERING processteknik och tillämpningar Aerobic Thermophilic Digestion – Technique and Applications
Aerobic thermofilic digestion (liquid composting) is an autothermal sludge stabilisauon process that normally operates at temperatures higher than 50°C. The process requires electric power for mixing and aeration. Otherwise, the technique is simple and reliable. A treatment plant which is properly designed and operares at high remperature produces a sludge that is stabilized, odourless and […]
DAKS FÖR GIS Databaserad Atlas över Kuster i Skåne / A GIS-Based Atlas Over Scanian Coasts
A GIS-based database for PC-use in a MS-Windows environment has been developed in order to ger a clear piciure of the present status of problems and information handling on coastal erosion problems in nine communities in southern Sweden (Båstad, Angelholm, Helsingborg, Lomma, Vellinge, Trelleborg, Skurup, Ystad and Simrishamn) coupled with actual remedial measures taken. Since […]
FOSFORFLÖDEN OCH EUTROFIERINGSEFFEKTER – KALIBRERINGAR OCH SIMULERINGAR MED LEEDS-MODELLEN I SJÖN SÖDRA BULLAREN / Flows and effects of phosphorus – calibrations and simulations using the LEEDS-model (Lake Eutrophication, Effect-Dose-Sensitivity model) in Lake S. Bullaren, Sweden
The main purpose of this work is to introduce the LEEDS-model (Lake Eurrophication, EfFect-Dose-icnsitivity-model) using a case srudy for Lake S. Bullaren, Sweden. This lake has been the focus of an agitated debate because there is a fish cage farm for rainbow trout in the lake, which has been accused of “ruining“ the lake. LEEDS […]
VAR TAR EMISSIONER FRÅN FISKODLINGAR VÄGEN? / Where are the emissions from fish farms in lakes?
This work presents results from a sedimentological investigation of Lake Södra Bullaren, Sweden, and a budget suspended matter for the lake. The basic question concerns the spread offeed wastes and faeces from a fish farm. Where do these emissions appear? Are they large in comparison to other fluxes of marerial causing increase in total-phosphorus-concentrations and […]
AVHÄRDNING I FLUIDISERAD BÄDD / Softening in Fluidized Bed
The copper corrosion in the distrubution net ofdrinking waters with high hardness and high alcalinity, i.e. an aggressive water, poses a problem in the sewage water treatments planrs due to a high content of copper in the sludge.Correct pH and carbondioxide content will reduce the aggressiveness of the water and heavily reduce the copper corrosion. […]
THE EFFECT OF A pH-ADJUSTMENT COMBINED WITH THERMAL PRE-TREATMENT ON THE DEWATERlNG OF SEWAGE SLUDGE
It is invesdgated whether heat-treatment combined with pH-adjustmenr improves the dewatering characteristics of sewage sludge. The treatment is done in order to secure hygienisated sludge by which the manuring and earth-improving effect of the sludge can be utilized in agriculture without any precautions in the case of a fullscale sewage plant. Furthermore fihrate from the […]
VILDFISKENS BET»DELSE FÖR SPRIDNINGEN AV FOSFOR FRÅN FISKODLINGAR / The importance of wild fish to the distribution of phosphorus from fish farms
The hypothesis tested in this work is that there is a significant direct uptake of phosphorus (from faeces from the culrivared fish and feed loss) from fish farms leading to increased growth ofwild fish. Direct uptake (DU) is defined as the phosphorus bound in wild fish. DU is associated with the growth ofall types ofwild […]
FISKODLING SOM MILJÖVÅRD? / Can emissions from fish farms be used as a remedial measure for lakes?
This work is based on data collected in the Liming-mercury-cesium project, and is, as far as the authors are aware, the most extensive set of dara collected to evaluate the eutrophication effecrs associated with fish farms in Swedish lakes. The hypothesis to test is whether fish farms raise lake phosphorus concentrations and thereby the production. […]
BEHOVET AV CELLULÄRA MODELLSYSTEM INOM AKVATISK RISKBEDÖMNING / The Need of Cellular Model Systems in Aquatic Risk Assessment
There is a great amount of chemicals in common use which are not adequately tested for their toxicity to aquatic animals. This is pardy due to the fact that tradiiional toxicity tests on animals are time consuming and expensive. Toxicity tests on higher animals are also erhically questionable and one can also quesdon the informative […]