Energieffektiviserad luftning på Sternö avloppsreningsverk / Energy improved aeration at Sternö Wastewater Treatment Plant
The objective of this study was to improve the aeration efficiency of a mid-size Swedish wastewater treatment plant in full-scale trials. The full-scale trials were performed at Sternö wastewater treatment plant, which was built in 1997 and is designed for 26,000 population equivalents. The biological treatment at Sternö wastewater treatment plant is performed in two […]
Cost functions for predicting capital expenditure of small town water systems in Ghana Kostnadsfunktioner för investeringar i vattenförsörjningssystem i Ghanas mindre tätorter
Using data gathered by the WASHCost project in Ghana, this study uses cost functions to predict capital expenditure for construction of piped water systems for small towns in Ghana. The data was collected from 45 small towns in peri-urban areas in the Volta, Ashanti and Northern regions of Ghana. Correlation and multiple regression analyses are […]
Vatten som ekonomisk vara / Water as an Economic Good
Detta är en översiktsartikel som ger inblick i nationalekonomins syn på och behandling av vatten. Artikeln förklarar begreppet värde och presenterar en rad metoder för att värdera vatten samt vilka svårigheter som finns med vattenvärdering. Vatten som en faktor i den globala ekonomin diskuteras också, samt att en rad möjliga lösningar på vattenrelaterade miljöproblem. Artikeln […]
Pairing multivariate data analysis and ecological modeling in the biomanipulated Lake Engelsholm, Denmark / Parvis multivariat dataanalys och ekologisk modellering i den biomanipulerade sjön Engelsholm, Danmark
A multivariate analysis was applied to monthly climatic, hydrologic and water quality series of Lake Engelsholm, a shallow lake that was subjected to biomanipulation. In this study, we focused on identifying the most important patterns of monthly time series after biomanipulation. Moreover, we tried to quantify how those variables are interconnected with each other. A […]
Avvägning mellan vattenkvalitet, växthusgasutsläpp och driftskostnad – utveckling av dynamiska modeller för integrerad benchmarking av avloppsreningsverk / Balancing effluent quality, greenhouse gas emissions and operational cost – developing dynamical models for integrated benchmarking of wastewater treatment plants
The scope for wastewater treatment plants (WWTPs) widens to consider not only water quality and cost, but also energy efficiency and greenhouse gas (GHG) emissions. The on-going research project, “Development and dynamic analysis of operational strategies for enhanced energy efficiency of wastewater treatment systems” aims to develop a tool for integrated evaluation of energy efficiency […]
Effects of hysteresis and temporal variability in meteorological input data in modeling of solute transport in unsaturated soil using HYDRUS-1D / Effekten av hysteresis och tidsupplösning av meteorologiska indata på modellering av föroreningstransport i den omättade zonen med HYDRUS-1D
A one-dimensional, unsaturated transport model was used to simulate non-reactive transport of solutes. The effects of soil water hysteresis, and temporal variability in precipitation and evapotranspiration input data were evaluated. Simulations were conducted in HYDRUS-1D code for the period 1996–2008 for three different geographic locations in Sweden and for three different soil textures. Simulations were […]
Berörda intressenters deltagande i vattenförvaltning – förändring, förnyelse och arv / Stakeholder participation in water management – change, renewal and legacy
The EU Water Framework Directive was adopted 2000 and aims at achieving good water quality in inland and coastal water. Two significant changes are that water should be managed according to natural boundaries and the emphasis on involving public and concerned stakeholders. These challenges call for a broadened knowledge on how to incorporate the new […]
Management of hydrogen sulfide in anaerobic digestion of enzyme pretreated marine macro-algae / Vätesulfidhantering vid rötning av enzymförbehandlade marina makroalger
Enzymatic pretreatment of algae by means of cellulose degrading enzyme was evaluated through lab-scale and pilot-scale experiments. The degradation efficiency of the enzyme depended on the initial physical quality of the algae. Lab-scale batch anaerobic digestion experiments showed comparatively low methane potential for the pretreated algae at both mesophilic and thermophilic temperatures. However, the raw […]
The impact of waves on the distribution of submerged macrophytes in kalvöfjord, sweden – a study of “comfort zones” / Vindvågors betydelse för distributionen av makrofyter i kalvöfjorden, – en studie av »komfortzoner»
A study of a shallow bay (Kalvöfjord) on the west coast of Sweden was conducted to determine the potential for wind waves to control the distribution of submerged macrophytes. A wave model was implemented, calculating the drag force exerted by the wave orbital motion. A new concept of “comfort zones” was introduced, ascribing an interval […]