In order to evaluate the effects of advanced wastewater treatment plants for phosphorus removal, the National Swedish Environment Protection Board during 1971 started a program for analysing the conditions in a number of recipient lakes. Some lakes from which sewage effluent was completely diverted were included. Of 23 lakes possible to evaluate, 15 responded positively […]
The linkage between (1) bottom dynamics, i.e. where areas of erosion (E), transportation (T) and accumulation (A) prevail, (2) lenses, i.e. fine highly moveable material-living and dead, inorganic and organic, recent and resuspended-that can be found on shores and on generally harder deposits predominating on E- and T-bottoms, and (3) the flux of nitrogen, which […]
The Laholm Bay on the Swedish west coast is a part of the estuarine system connecting the Baltic and the Atlantic. Its hydrography is characterized by a strong vertical stratification. Intensive plankton blooms and mass development of Cladophora have occurred during the last ten years. Low oxygen concentrations, and even hydrogen sulphide, have been observed […]
Författare SIEGFRIED FLEISCHER, LARS RYDBERG, LARS STIBE, and JOHAN SUNDBERG
In connection with the inter-Nordic standardization (INSTA) of methods in water chemistry, some methods for the determination of sulfate have been evaluated. Two manual spectro-photometric methods were tested, one based on the reagent thorin and the other on methyl thymol blue (MTB), but neither of them were acceptable; the thorin method had a too narrow […]
An automatic method for fractionation and determination of aluminum species in natural waters is described. The method is an automatic modification of the catechol violet method of Dougan and Wilson (1974). The fractionation step is an automatic modification of the ion-exchange procedure suggested by Driscoll (1980). The method yields three aluminum fractions: total monomeric aluminum […]
Författare EIRIN J. S. RØGEBERG and ARNE HENRIKSEN
A modification of the Kjeldahl method has been tested in a collaborative study involving 16 laboratories. The method measures the sum of organic and inorganic nitrogen in industrial and municipal effluents. Nitrate and nitrite are reduced with Devarda’s alloy and the organic material is destroyed with sulphuric acid in the presence of copper. The ammonium […]
Nyckelord (Keyword) BRITA STARCK and KIRSTI HAAPALA
It has been more and more common to use centrifuges for the removal of sludge during sewage processing. The centrifuge process is relatively complex and requires valuable polymers to be effective. In addition reject water is re-introduced for re-purification which usually entails an inordinate extra load on the sewage plant, particularly during periods of high […]
Författare SIXTEN DE BESCHE, GERDT FLADDA, , and HANS WIKSELL
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