LOKAL AGENDA 21 – EN UTMANING FÖR VA-SEKTORN / Agenda 21 – A Challenge for the Water Supply and Sanitation Sector
To create a Local Agenda 21-process, is a very challenging task, which requires knowledge, political will, and political clout. The experience that we hitherto have in Sweden, shows the importance of commitment to the work, within as well the political as the administrarive leadership in the municipalky. Water is, in many ways, an inregrating factor […]
INFLUENCE OF SUPPORT MEDIA IN ANAEROBIC FIXED-FILM BIOLOGICAL PROCESSES
Anaerobic fixed-film biological processes for wastewater treatment have been used for many years. Still, the influence of the support medium is not fully understood and contradictory statements are often found in the literature. The reason for this is the complexity and variation of the organic material normally found in the wastewater to be treated and […]
ANALYS AV VFA – EN ENKEL TITRERMETOD / Analysis of VFA – A Simple Titration Procedure
A decisive factor in the operation of an enhanced biological phosphorus removal (EBPR) process is th availability of readily biodegradable organics in the influent. Especially important is the amount of volatile fatty acids, VFA. At the WWTP in Helsingborg, Öresundsverket, full-scale EBPR-tests in two of the four trains are running. Hydrolysis of primary sludge in […]
AN EVALUATION OF COST EFFICIENCYAND SUSTAINABILITY OF DIFFERENT WASTEWATER TREATMENT PROCESSES
In order to be able to determine wheiher or not a wastewarer treatment method is the best one in a given case, it would be beneficial if the treatment method could be evaluated both with respect to cost efficiency (cost in relation to receiving water improvemenr) as well as sustainability (consumption ofraw materials and energy). […]
FÖRFÄLLNING AV HUMUSRIKA YTVATTEN – APPLICERAD SLUTNING TILLVATTENVERKETS RÅVATTENINTAG / Pre-Treatment of Humus Contaminated River Waters – Applied at the Intake of Water Works
This paper presents a new technology for the treatment of humus contaminated river warers, using ferri/flocculation and floating sedimentarions tanks, insralled in a lakewater body, connected to ihe main water resevoire of the Vaasa potable water works, in Finland. The capacity ofthis plant is 1 000 m3/h. It started in the summar 1995. Vaasa water […]
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 […]