Theoretical studies of the movement of moisture in an unsaturated zone are associated with the analysis of the Richards equations. The corresponding mathematical problems are designed to answer practical questions related to the replenishment of groundwater reserves, the degree of their protection from pollution coming from the surface, and the needs of agriculture. The value […]
Författare
A.Yu. Belyaev, I.O. Yushmanov
Nyckelord (Keyword)
Unsaturated zone, non-stationarity infiltration
Årgång
2022
Nummer
1
Utgåva
Hydrogen sulphide (H2S) causes odours and concrete corrosion even in very small concentrations. Con-crete corrosion of 5 cm in 5 years has been observed when the hydrogen sulphide content has been 20 ppm. Unavoidable hydrogen sulphide formation in pressure sewers begins when wastewater is put under anaerobic conditions. Anaerobic conditions begin after 0.5 – 2 […]
Författare
J. Sallanko, J. Arfman, M. Arbrandt
Nyckelord (Keyword)
Hydrogen sulphide; gravity aeration; step aerator; pressure sewer; concrete corrosion, odours; gravity sewer
Årgång
2022
Nummer
1
Utgåva
Chemical contamination of drinking water is of great concern for public health. Chemical analyses are used for monitoring of selected chemicals, however no information on potential toxicity of the mixture of chemicals in a water sample is obtained. Effect-based methods are new tools to evaluate the hazard of the whole mixture of chemicals present in […]
Författare
Agneta Oskarsson, Johan Lundqvist
Nyckelord (Keyword)
Aryl hydrocarbon receptor; bioanalysis; bioassays, bioanalytical tools, disinfection byproducts; effect-based analysis; endocrine activity; Nrf2
Årgång
2022
Nummer
1
Utgåva
The concept” Sustainability” has become an indeed demanding metaphor within society. However, without a deeper understanding and more accurate use of the word it may very well, by and by, become obsolete. In this paper the question is focused on the development of wastewater treatment. Some “curial” demands on a more specific approach to sustainability […]
Författare
Stig Morling
Nyckelord (Keyword)
Compact plant, complex compounds, historic perspective, nutrients
Årgång
2022
Nummer
1
Utgåva