Especially in developing countries, the rapid growth of densely populated areas makes great demands upon planners and decision-makers. There is, among other things, a strong need of rational management of water resources within the framework of integrated societal planning. The complexity exhibited by large urban areas calls for a new approach in planning and management, […]
Författare
GUNNAR LINDH
Nyckelord (Keyword)
water resources, urban area, ecosystem, planning and management
Årgång
1986
Nummer
1
Utgåva
A simple nomograph for determining the time required to reacidify a limed lake to pH 6 has been made with the reacidification model developed at the Department of Chemical Engineering, The Lund Institute of Technology. It predicts the reacidification as a function of the hydraulic residence time, the amount calcite on the bottom and the […]
Årgång
1986
Nummer
1
Utgåva
The National Swedish Environmental Protection Board recommends a standard value method for calculation of mass transport of pollutants via storm water sewer systems. In this paper mass transport calculations based on this method are compared with actual measurements. Measurements during one and a half years in the city of Lund show high amounts of leakage […]
Författare
WILLIAM HOGLAND, RONNY BERNDTSSON and MAGNUS LARSON
Nyckelord (Keyword)
stormwater, pollutants, masstransport, modelling.
Årgång
1986
Nummer
1
Utgåva
Bacteria attach and grow on surfaces in all biologically active systems. Municipal drinking water represents such a system. It can be questioned if desinfectants are active against bacteria growing on surfaces in the same order as against free-living bacteria. What will happen if patogenic bacteria for some reason occupy a niche amongst the surface living […]
Författare
KARSTEN PEDERSEN, LARS BRÄNDSTRÖM and ANNA-KERSTIN OLSSON
Nyckelord (Keyword)
Acinetobacter calcoaceticus – Caulobacter sp. – Pseudomonas alcaligenes – drinking water -PVC – polyethylene – copper – glass – attachment.
Årgång
1986
Nummer
1
Utgåva
Nitrogen transport in three South Swedish rivers was compared with the amount of nitrogen drained to the rivers from the surrounding arable land, using mass balance calculation. It was found that as much as 25-30 % of the nitrogen is denitrified during the transport in the rivers. Denitrification may be an important process for decreasing […]
Författare
MATS JANSSON, LARS LEONARDSON, och ULF RÖNNER,
Nyckelord (Keyword)
denitrification, running water, eutrophication, coastal water.
Årgång
1986
Nummer
1
Utgåva
P removal from wastewaters by electrolysis was examined by an experimental laboratory system. Al electrodes were applied in accordance with previous experiments to find the best conditions (pH, water flow, energy consumption) for P removal. Alternating current with a frequency of 0.0039 Hz made ”self-cleansing” of the electrodes possible and provided a favourable energy consumption […]
Författare
O. GRØTERUD and L. SMOCZYNSKI
Nyckelord (Keyword)
premoval, Al electrodes, alternating current, high pH, water flow, energy consumption
Årgång
1986
Nummer
1
Utgåva
Phosphorus and nitrogen mass balances for the Baltic Sea are presented (mainly based on data from Larsson et al. 1985) for three situations: 1) present situation, 2) after 80 % P and N removal from point sources, 3) in natural conditions. The balances indicate that a phosphorus removal from point sources will lead to a […]
Författare
JENS MØLLER ANDERSEN
Nyckelord (Keyword)
Baltic Sea, eutrophication, nutrients, massbalances.
Årgång
1986
Nummer
1
Utgåva
Lagan är södra Sveriges mäktigaste vattendrag. IVL har på uppdrag av Lagans Vattenvårdsförening sammanställt en skrift till föreningens 30-årsjubileum. Skriften beskriver utveckling, utnyttjande och vård av ett vattendrag genom en tidsperiod som präglats av industrialisering, stora vattenvårdande insatser och ett ökande ansvar för bevarande av våra vattenresurser. Framtida beslut om vattenvårdande åtgärder blir svårare i […]
Nyckelord (Keyword)
Lagan River basin, water protection 1955-1985, hydrology, water quality, land- and water planning
Årgång
1986
Nummer
1
Utgåva
The possibility to reduce power consumption in aerated lagoons by means of a combination of mixers and aerators is discussed. Two theoretical examples based on recent studies in the US and experiences from aerated lagoons in Sweden and Tunisia are calculated to show the potential energy saving by using mixers and aerators in combination. The […]
Författare
STIG MORLING
Nyckelord (Keyword)
aeration-basins, aeration-mixing, energy cost, oxygen input
Årgång
1986
Nummer
1
Utgåva