The focus on environmental aspects in the society has increased the strive to find sustainable sysrems for drinking water production. This has lead to a greater inrerest in biological filtration, for example slow sand filtration (SSF). Biological pretreatment of raw water might reduce the need for chemicals in the following treatmem steps, with reduced sludge […]
Reactive filter material, sorbents, can be used to remove phosphorus (P) from wastewater through sorption processes. The technique implies that the wastewater pass a fdter that is incorporated in a soil bed or a constructed wetland. When P-saturation is achieved, the sorbent can be recycled to agriculture, since the sorbed phosphorus is available for plant […]
Författare LENA JOHANSSON, LARS D. HYLANDER och GUNNO RENMAN
This paper is based on several studies on the long-term development of water and sanitation services in Finland and presents the evolution of domestic wastewater treatment in Finland in the 20th century. It shows that the first phase of wastewater treatment development took almost 60 years; thereafter the systems expanded rapidly over two decades to […]
Författare TAPIO S. KATKO & JUSSI LEHTONEN
Nyckelord (Keyword) evolution, water pollution control, domestic wastewaters, wastewater treatment, Finland
The governing processes involved in both urban and rural hydrology are the same, but the climatic and surface conditions in the urban environment are different, hence, snowmelt and runofFgeneration also differ. However, snowmelt is a neglected part of urban hydrology. Indeed, urban runoffmodels and drainage systems have been developed for rainfall events. This paper discusses […]
The eutrophication of the Balric Sea has resulted in a decision in the Swedish Parliament that every wastewater treatment plant on the Baltic coast with more than 2000 customers has to have a nitrogen reduction system. This investigation compares the three methods for nitrogen reduction, that are in full use in Sweden: constructed wetlands, fluidized […]
Available observations are often not suffcient as a basis for decision making in water management. Conceptual runoff models are frequently used as tools for a wide range of tasks to compensare the lack of measurements, e.g. to extend runoff series, compare design floods and predict the leakage of nutrients or the effects of a climatic […]
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