EFFECTS OF SIMULATED SUNLIGHT ON AQUATIC HUMIC MATTER
Natural humic water was treated with simulated sunlight (310-800 nm) and the effects on some chemical parameters and the molecular size distribution of the dissolved organic matter were recorded. The dissolved organic carbon content, the light absorbance (254 nm), and the colour were found to decrease substantially already after irradiation for 24 hours. The proportion […]
STUDY OF ACIDIFICATION, BUFFER CAPACITIES AND THEORETICAL NEUTRALIZATION DOSE OF NATURAL WATERS BY POTENTIOMETRIC pH-TITRATIONS
Water samples were taken during the ice-free period in 1991 from Isojoki river in southwestern Finland to study seasonal and local variations of the water chemistry of the river. In this paper we have especially concentrated on acidification problems and buffer properties of the river water. Except measurements of pH, alkalinity and other parameters, buffer […]
REDUKTION AV AMMONIUM I LAKVATTEN I SATSVIS BIOLOGISK REAKTOR / Reduction of Ammonium in Leachate in a Sequenced Batch Reactor
Fågelmyran municipal landfill site, situated some ten kilometers north of Borlänge, Sweden, is run by Borlänge Energi AB. Leachate generated at the landfill is conveyed to the municipal wastewater treatment plant. Treatment is costly, inefficient and may affect the sludge quality negatively. Borlänge Energi decided to investigate the treatability of the water using existing facilities […]
ANRIKNING AV FOSFOR I STADSREGIONEN EN FOSFORBUDGET FÖR STOCKHOLM 1990 / Accumulation of Phosphorus in Urban Regions – a Phosphorus Balance for Stockholm 1990
Dephosphatation in sewage has reduced the P-loading on the recipients, but has at the same time resulted in an accumulation of P in urban regions. Will this accumulation with time give rise to increased pollution from non-point sources of P? In order to quantify the P turnover in urban regions, a P-balance has been calculated […]
KONSTGJORD INFILTRATION VID EMMABODA VATTENVERK / Artificial Groundwater Recharge at Emmaboda Waterworks
The artificial groundwater recharge has been studied in order to earn knowledge about the processes active in this kind of drinking water production. Water and soil samples were taken from the infiltration basin and analyzed for their content of iron, manganese and organic carbon. The quality of the infiltrating water was rapidly improved with 95 […]
KONTINUERLIGA VARNINGSSYSTEM FÖR FÖREKOMST AV NITRIFIKATIONSHÄMMANDE ÄMNEN I AVLOPP / Warning Systems for the Presence of Nitrification Inhibiting Compounds in Wastewater
The presence of compounds inhibitory to nitrification in sewage treatment is a severe problem when introducing biological nitrogen removal at municipal treatment plants. These compounds often have their origin in industrial wastewaters connected to the municipal sewage works. One way to decrease the risk for inhibition of the nitrifying microflora in the treatment plant is […]
ODLADE SVAMPARS OCH BAKTERIERS FÖRMÅGA ATT AKTIVERA DET PROFENOLOXIDAS-AKTIVERANDE SYSTEMET FRÅN KRÄFTORS BLODKROPPAR / The Ability of Fungi and Bacteria to Activate the Prophenoloxidase Activating System from Crayfish Blood Cells
The immune defence of arthropods is specifically and efficiently turned on after infection with fungi or bacteria. Different proteins in the blood of the animal are activated by the addition of cell wall polysaccharides from these microorganisms, and the activation can be studied in vitro with commercial substrates that form coloured products after enzymatic reaction […]
IMPACT OF OVERFLOWS ON ACID-BASE CHEMISTRY IN LIMED LAKES
During the winter ice-cover an inverse thermal stratification arises in dimictic lakes because cold surface water overlays the warmer and deeper lake water owing to differences in density. This condition can create so-called overflows in lakes, with the result that cold inflow water will only mix with the surface water immediately below the ice-cover. Changes […]
KALKNINGSPLANERING I VATTENDRAGSSYSTEM MED PULS-MODELLEN / Planning of Liming Activities in Rivers with the PULSE-model
A hydrochemical model (PULSE) has been used to simulate liming activities in Ljustorpsån, a tributary to river Indalsälven in central Sweden. The PULSE-model is a conceptual runoff model with possibilities to simulate some chemical variables, such as alkalinity and pH. The PULSE-model treats alkalinity as a function of the calculated groundwater level in the model. […]
TILLFÖRSEL AV NÄRSALTER TILL KUSTVATTEN – EN STUDIE AV TRANSPORT OCH RETENTION I VADSBÄCKEN, ÖSTERGÖTLAND / Diffuse Pollution of Coastal Waters – a Study of Nutrient Transport and Retention in a Small Watershed of Southern Sweden
Transport and retention of nitrogen and phosphorus was studied in a small (51 km2), agricultural watershed in southern Sweden. The article deals predominantly with: – comparison of different methods for nutrient transport calculation; – estimation of nutrient retention in a meandering part of the stream; – analysis of two similar tributaries with different nutrient transport. […]