Alla artiklar

Volatile organics in bottled waters from Sweden were analysed by stripping enrichment followed by gas chromatography (GC/ECD and GC/FID) and chromatographic sniffing. The GC/FID analyses showed that measurable amounts of organic substances leached from plastic (PET) bottles and Tetra-Brik packages. Chromatographic sniffing showed that the earthy or musty off-flavours, often found in tap water were […]

The present study has shown that surface water, groundwater and soil, even in areas far from industrial emissions, contain large pools of adsorbable, organic halogens (AOX). Gel chromatographic fractionations and studies of adsorption of AOX on activated carbon at different pH values indicated that a considerable fraction of the organohalogens are associated with high molecular […]

The spreading of heavy metals from a metal rich deposit in surface waters is examined from measured concentrations in draining rivers and a series of lakes downstream the deposit, during a period of 3 years. The decreasing concentrations observed in the lakes appear to be the result of mixing of effluents from the deposit with […]

The current debate concerning land application of sewage sludge is briefly reviewed. Of major concern in the public debate today is the presence of organic micro-pollutants in the sludge. Sludge quality data from Swedish plants related to trends in contents of heavy metals, PCB and DDT are discussed. A large decrease can be noted. This […]

This paper introduces different intermittent biological treatment methods of waste water to the Swedish public. Intermittent methods are widespread internationally, but seldom used in Sweden. The following methods are presented: – the Intermittent Cycle Extended Aeration process (ICEAS) – the phased isolation ditch process, namely the ”biodenitrosystem” – the Sequencing Batch Reactor process (SBR). The […]

Production of drinking water by slow filtration is an old method getting new aspect nowadays. Filtration mechanism is on principle the same as in other granular filters. Dispersed matter is destabilized by biochemical activity of microorganisms. Separated organics retained in the filter for several months/years are degradated by aerobic digestion instead of being removed by […]

Reverse osmosis was found to reduce >90 % of the nitrate content in ground water from two different wells. Alternatives like ion exchange (e.g. CARIX) were found in literature.

Asketjern/Blaker waterwork (ca. 5,500 persons) was until 1985 supplied with acid, soft surface water with a high humus concentration. The distribution system consists mainly of asbestos cement and cast iron pipes, and severe corrosion occurred. pH near 11 was measured at end points of asbestos cement pipes. There was no treatment for corrosion control. From […]

The concentrations of chloroform, carbon tetrachloride, dibromochloromethane, bromoform, methyl chloroform and perchloroethylene have been determined at 13 stations in the area of the petrochemical centre at Stenungsund. The concentrations of methyl chloroform and perchloroethylene confirm a water exchange of Askeröfjorden of 5-15 % per day. Large variations of the halocarbon concentrations at depths of 1 […]

Swedish environmental policies have aimed at connecting even small point source discharges to tertiary treatment plants, either by large scale collection and treatment systems or by small separate plants. The cost-effectiveness of the strategy for a number of urban areas with less than 1,000 inhabitants was evaluated in one municipality (115,000 inhabitants) in the south […]