A city is an alien element in natural ecological systems. All anthropogenic systems become monocultures with open material and energy systems. Overexploitation of natural resources (raw materials, water), or enrichment of residuals (pollutions) are the consequences. Today it is clear that urban areas must be kept in some kind of equilibrium which is acceptable for […]
Författare JANUSZ NIEMCZYNOWICZ
A high resolution hydrodynamic model is used to estimate fluxes between boxes in a coarse compartment model. The latter model may include complex biogeochemical processes, here exemplified by dispersion of radionuclides released from a nuclear power plant. The water recipient – Öregrund Grepen – is assumed non-stratified and the circulation to be mainly winddriven. The […]
Författare LARS GIDHAGEN and LARS RAHM
Nyckelord (Keyword) Box model, circulation model, coastal recipient, dispersion, radionuclides, Öregrund Grepen.
MODELLSTUDIE AV METALLTRANSPORT GENOM EN SJÖ I ETT GRUVOMRÅDE / Modeling Metal Transport through a Lake in a Mining Area
Lakes have an important impact on element mass transport. The reduced velocity results in an increasing sedimentation and chemical and biological processes have time to influence the transport. Hydrochemical models can be helpful in the study of the importance of different processes. In this study we present simulated concentrations and mass transport of zinc, copper […]
Författare PER SANDÉN and BENGT CARLSSON
Nyckelord (Keyword) mass transport, lake, zinc, copper, cadmium, hydrochemical model.
MILJÖKONSEKVENSER VID ANVÄNDANDE AV DRÄNERANDE VÄGBELÄGGNING – EN LITTERATURSTUDIE / Environmental Influence from Using Porous Top Pavement – a Literature Study
Open black top pavement has advantages over usual black top in view of economics, accidental statistic and environmental factors. Noticed about the environmental advantages are lower load on waste water filtration plants, lowered risk for spillway overflow, less pollution to recipients, lowered noice levels for traffic and sustained ground water balance. The risk for clugging […]
Författare KARIN GÖRANSSON and HELENA JONSSON
Nyckelord (Keyword) environment, ground water balance, ground water pollution, open top pavement, pavement, unit superstructure.
KONTROLL AV SULFID-TOXICITET VID ANAEROB RENING AV INDUSTRIELLA PROCESSVATTEN / Control of Sulphide Toxicity in Anaerobic Treatment of Industrial Wastewater
Sulphide toxicity due to high concentrations of sulphurous compounds in some industrial wastewaters results in difficulties when using the favourable anaerobic treatment; it even makes anaerobic treatment impossible. Today, several methods are available for control of sulphide toxicity: heavy metal sulphide precipitation, addition of alkali to raise pH and thereby convert the toxic H2S to […]
Författare ERIK SÄRNER
Nyckelord (Keyword) anaerobic treatment, sulphide, toxicity, toxicity control, pretreatment.