Artifcial recharge of groundwater is being used for drinking warer production in Latvia. The ultimate removal of organic matter from the surface water during artificial recharge of groundwater is accomplished by microrganisms living in the subsurface. In order to predict changes of water quality, more information about the disribution of microorganisms between infiltration ponds and […]
Författare
TALIS JUHNA and GUNTA SPRINGE
Nyckelord (Keyword)
artificial recharge of groundwater, schmutzdecke, filter sand, vadose zone, microorganisms.
Årgång
1998
Nummer
4
Utgåva
CHEMICAL OXYGEN DEMAND (DICHROMATE VALUE) AND THE SWEDISH BAN ON MERCURY, OPPORTUNITIES AND PITFALLS
The Chemical Oxygen Demand (COD) test is a key parameter for process control and the routine monitoring of effluent quality in wastewater. However, the present procedure for determination has ro be replaced becausethe scale of COD test chemicals containing Hg will probably not be permitted after the year 2000 in Sweden. Mercury-free procedures are reviewed […]
Författare
GREGORY M. MORRISON
Nyckelord (Keyword)
chemical oxygen demand, mercury free COD, closed rube COD, total organic carbon
Årgång
1998
Nummer
4
Utgåva
This paper describes differences between the urban drainage models MOUSE, EPA-SWMM and NIVANETT, relating to the routing of flows through pipes. NIVANETTs kinematic wave procedure simulates rather similar hydrographs to those of MOUSE, when the conduit lengths are shorter than ca. 500 m and the slope is steeper than ca. 1/1000. Keeping in mind that […]
Författare
O. LINDHOLM and G. LINDHOLM
Nyckelord (Keyword)
models, storm runoff, hydrographs, comparison
Årgång
1998
Nummer
4
Utgåva
The paper describes the trends of water consumption, particularly per capita in Finland from 1970 to 1996 and includes comparisons from other countries. The per capita consumption started to decline due to two major impetus; the energy crisis of 1973 and the Wasrewater Surcharge Act of 1974. The latter more than doubled the average price […]
Författare
TAPIO S. KATKO, PETRIJU HOLA and SAILA KALLIOINEN
Nyckelord (Keyword)
water consumption, specific consumption, households, design criteria, Finland
Årgång
1998
Nummer
4
Utgåva
The Rya Wastewater Treatment Plant, serving the Göteborg Region on the West Coast ofSweden has been ex- ended for nitrogen removal. The process includes post nitrification in trickling filters and predenitrification in non-nitrifying activated sludge system. In this paper some experience from the first year of full-scaleoperation will be related. The staied effluent standard of […]
Författare
ANN MATTSSON
Nyckelord (Keyword)
nitrifying trickling filter, post nitrification, nitrogen removal, biofilm, predators, full scale operation
Årgång
1998
Nummer
4
Utgåva
A large number of biological processes have been developed to meet different needs since the early forms of the trickling filter and the activated sludge process were introduced. One of the goals developing new processes often was to increase the total amount ofbiomass in the process. In several of these new processes, the surfaces of […]
Författare
ERIK SÄRNER
Nyckelord (Keyword)
moving bed, carriers, biofilm process, biological treatment, review
Årgång
1998
Nummer
4
Utgåva
The paper presents the Swedish Water Management Research Program towards catchment-based strategies for sustainable resource use (VASTRA). The major goal ofVASTRA research is to develop catchment-based water management strategies which are sustainable from ecological, economical and social perspectives. As a. point of departure, VASTRA views catchments from three pardy overlapping resource perspectives. The first one […]
Författare
H. B. WITTGREN
Nyckelord (Keyword)
aquatic biodiversity, decision support tools, ecological services, ecotechnological methods, groundwater management, multi-disciplinary research
Årgång
1998
Nummer
4
Utgåva