Environmental systems analysis of urban water systems – historical account of published work in scientific journals/ Miljösystemanalys av urbana vattensystem – historik av publicerade verk i vetenskapliga tidskrifter
This paper is a literature review of environmental systems analysis studies – adopting the LCA (life-cycle assessment) approach – of urban water and wastewater systems. Both with respect to the number of scientific journals referred to and the time-period of publication, the scope has been limited. The time period considered is 2000–2014, and the number […]
Quicker response to quality changes in incoming water with decision support for coagulant dosage at Görväln drinking water plant / Beslutsstödssystem för koagulantdosering på Görvälnverket ger snabbare respons på kvalitetsförändringar i råvattnet
A decision support system (DSS) for control of the coagulant dosage at the Görväln drinking water plant has been developed and implemented. The goal with the DSS was to enable the transition from manual to automatic control of coagulant dosage. The DSS is based on a multivariate statistical regression (PLS) model mimicking the operators’ manual […]
Structure and Properties of Peat Humic Substances / Struktur och egenskaper för humus från torv
Humic substances are formed in very different environment and the relations between properties (and structure) and precursor biota composition still is far from being clarified. The aim of this study was to analyse relations between properties of the peat, peat humic acids and humification degree on example of analysis of three bog profiles in ombrotrophic […]
NOM removal through coagulation, sedimentation and filtration as a remedial action to prevent adverse effects of re-growth in networks / Fjerning av NOM ved koagulering, sedimentering og filtrering som tiltak mot biofilmdannelse i ledningsnett for drikkevann
A qualitative and quantitative monitoring of biofilm formation was performed in four categories of water: raw water, filtered water (after removal of natural organic matter (NOM)), disinfected water and distributed water. The biofilm formation was reduced by 95–99 % as a result of the NOM removal, a reduction considerably more significant than indicated by the […]
The Effects of Catchment Soils and Land-use on the Relationship between Organic Matter with Chlorine Decay and THMFP / Hur jordart och markanvändning i avrinningsområdet påverkar sammansättningen av organiskt material, klorsönderfall och trihalometanbildningspotential
With significant problems caused by organics in drinking water, comprehensive knowledge of its concentration, character and reactivity in relation to catchment features and management is important. In a study reported here, six contrasting zero order catchments of the Myponga Reservoir, South Australia were selected to determine the impacts of catchment characteristics and land management practices […]
Effect on dissolved natural organic matter proxies by increased complexation with iron / Effekter av økte jernkonsentrasjoner på parametere som beskriver egenskapene til løst naturlig organisk materiale
Absorbency of UV and visible light by dissolved natural organic matter (DNOM) is used in proxies (sUVa, SAR) to assess its physiochemical characteristics and thereby removability of the DNOM by waterworks. The ongoing browning of surface waters is partly due to increased concentration and change in characteristics of DNOM. However, it is also likely that […]
NOM diagnostics for the assessments of source water treatability and treatment performance at water supply systems in Norway / NOM-analyser för att bedöma ytvattens behandlingsbarhet och beredningsegenskaper från vattenverk i Norge
This paper presents data on water quality and NOM characteristics from analyses of raw and treated water samples from some 30 water supply systems in Norway. Three different water treatment technologies were applied: (1) Enhanced Coagulation (EC); (2) Ozonation-Biofiltration (OBF); or (3) Nano-filtration (NF). The water samples were analysed using simple NOM characterisation methods and […]
Dricksvatten – vattnets beredning inför desinfektion med UV Koagulationsfiltrering i snabbfilter / Drinking water – preparation for disinfection with UV-light Coagulation filtration in rapid sand filters
In the early 70ies, water in lakes and streams in Sweden was generally clean enough for minimal water treatment to be considered sufficient. The situation was altered by the introduction of novel organisms, e.g., Cryptosporidium and Giardia, into Swedish waters. Since the year 2000, these unicellular parasites are inherent to several surface waters in Sweden. […]