FÖRSLAG TILL FRAMTIDA MILJÖÖVERVAKNING AV MARK, GRUNDVATTEN SAMT SJÖAR OCH VATTENDRAG / Proposed Future Monitoring of Soil, Ground- and Freshwater
The Swedish Environmental Protection Agency has been commissioned by the Swedish Government to evaluate the present and propose a new environmental monitoring and assessment programme for Sweden. Decisions on the new national monitoring programme will be taken in February 1993 and decisions on the regional programmes later in the spring. The aims of the proposed […]
DAGENS SAMORDNADE RECIPIENTKONTROLL – BRA ELLER DÅLIG? / Regional Freshwater Monitoring Programmes in Sweden – Present Quality?
The Center for Environmental Monitoring at the Swedish University of Agricultural Sciences has on commission by the Swedish Environmental Protection Agency (SEPA), and as a part of the current inspection of national and regional environmental monitoring programmes, evaluated the regional freshwater monitoring programmes supervised by the County Administrations in Sweden. The task has been to […]
KOMBINERAD BIOLOGISK FOSFOR- OCH KVÄVEAVSKILJNING STUDIUM AV DYNAMIKEN I DE OLUFTADE REAKTORERNA / Combined Biological Phosphorus and Nitrogen Removal – Study of the Dynamics in the Unaerated Reactors
To be able to use the available volumes as effectively as possible in a process for combined biological phosphorus and nitrogen removal, knowledge about the variations during the day and the week is needed. This work is a comparison between the behaviour in the unaerated reactors during a typical wednesday (high COD/TKN ratio) and a […]
A STUDY OF A PERCOLATION BASIN IN COLD CLIMATE
Infiltration facilities have become more common during recent years due to problems associated with the conventional storm watersystems, such as overflows and the release of pollutants into receiving waters. In northern Sweden, stormwater pipes and manholes have often been damaged by frost heave and ice formations, resulting in overflows during the snow melt period. In […]
FILTERMASSOR FÖR BEHANDLING AV SURA BRUNNSVATTEN / Filter Materials for the Neutralization of Acidic Wellwate
Private water-supply wells, fed by acidic groundwater, commonly have problems with corrosion of household connections. To control these problems the water can be treated in filter units containing calcerous materials. At the Department of Sanitary Engineering, Chalmers University of Technology, filter materials for neutralisation have been investigated. The materials tested were crushed limestone (CaCO3) and […]
KVICKSILVERS FÖRDELNING MELLAN VATTEN OCH SLAM I TVÅ RENINGSVERK / The Distribution of Mercury between Aqueous Phase and Sludge Phase in two Sewage Treatment Plants
Direct determinations of the distribution of mercury between aqueous phase and sludge phase have not been made earlier. One reason might be the low concentration level of mercury, which is close to or below the detection limit for the analytical procedures in common use. The mercury concentration in the sludge phase is however much higher […]
PROCESSES THAT DETERMINE THE pH OF SEAWATER
The pH of seawater is dependent on shifts in the autoprolysis of hydrogen carbonate 2 HCO3-= CO2 + H2O + CO32-caused by the production and decomposition of planktonic maiter. Using stoichiometric relationships and mean concentrations of nitrate and phosphate it is shown that surface seawater will have a pH close to 8 at 15°C on […]
UDBYGNING – BLA VED RENSNING AF REJEKTVANDET – AF FREDERIKSHAVN KOMMUNES CENTRALRENSEANLÆG / Extension – Including Reject Water Treatment – of the Municipal Sewage Treatment Plant of Frederikshavn
In June 1990 the Municipality of Frederikshavn inaugurated the world’s first full-scale plant for chemical-physical treatment of the reject water. After a working period of more than a year with adjustments and corrections the plant is working very satisfactorily, and together with the planned installation of the French developed BIOSTYR system the reject water treatment […]
PILOTSKALEFÖRSÖK MED NITRIFIERING AV REJEKTVATTEN MED SBR-TEKNIK PÅ BROMMA RENINGSVERK / Pilot Plant Scale Investigations of Nitrification of Sidestreams with SBR Technology at Bromma Sewage Treatment Plant
A pilot plant scale investigation of nitrification of sidestreams from centrifugation of digested sludge was carried out at Bromma sewage treatment plant in the beginning of 1991. The SBR technology (Sequencing Batch Reactor technology) was implemented. The investigations, which have been carried out, showed that the SBR technology is appropriate for nitrification of sidestreams. Complete […]
VAD ÄR EGENTLIGEN DENITRIFIKATION OCH HUR MÄTS DEN? / What is Denitrification and How is it Measured?
Denitrification involves the bacteria-mediated reduction of nitrate, nitrite and nitrous oxide to atmospheric dinitrogen. The evolved nitrogen gas usually leaves the environment in which it was produced and diffuses to the atmosphere. The process appears in most environments where decomposable organic matter has accumulated, e.g. soils, lake sediments and wetlands. Through the decomposition of organic […]