Att finna läckor i vattendistributionsledningar underlättas med kännedom om deras ljudegenskaper / Finding leaks in water distribution pipes is made easier with knowledge of their acoustic properties
This paper reviews the acoustic conditions in water distribution pipes, comparing a typical background noise with the noise that can be registered when a leak is present. Five different acoustic characteristics are discussed, namely the resonance frequency of the pipe system, the turbulent pressure variations that are caused by a leak, the wide band noise […]
Regnvatteninsamling från hustak på södra Gotland / Rainwater collection from a roof on southern Gotland, Sweden
The availability of drinking water from water wells on southern Gotland is highly limited on account of the fractured limestone bedrock of the region, and one possibility for supplying water in this region is to collect rainwater from roofs. For several years, rainwater was collected from a roof on southern Gotland in order to supply […]
Preparation and Evaluation of a Ce(IV)-La(II) binary hydroxide Adsorbent as Recovery of Waste Ceria Powder From Glass Polishing Process For Effective Arsenic Removal
In this paper Ce(IV)-La(III) binary hydroxide adsorbent, herein referred to as CLH adsorbent, which is a recovery of waste ceria powder from glass polishing process, is used as a novel adsorbent for removing inorganic arsenic (As) from water. The CLH adsorbent is prepared using a combined acid and heating treatment method, which involves refluxing the […]
Extrema regn i Halmstad / Extreme rainfall in Halmstad, Sweden
Within the last decades, the data collection in Swedish municipalities has shown to be valuable with respect to gaining information on the statistics of heavy rain storms. This article is focused on rain data from Halmstad municipality, located in a region of the highest yearly precipitation amounts for Swedish conditions, especially in the interior parts, […]
Shared history of water supply and sanitation in Finland and Sweden, 1860–2000
Sweden and Finland have a long joint history separated in 1809 when Finland became an autonomous Grand Dutchy under the Russian Tsar. The water service sector started developing in urban areas during the latter part of the 19th century. The similarities and differences between Finland and Sweden in the water and wastewater services evolution are […]
Reflexioner om vatten – hur hållbar är vår svenska avloppsrening? / Is Swedish wastewater treatment sustainable?
Sustainability reflects one of the major issues for mankind today, and is possibly one of the key factors for a long time survival on planet earth. Sustainability in this paper is discussed from the viewpoint of water protection and especially wastewater treatment. Focus is done with respect to municipal wastewater management. It is acknowledged that […]
Hög koncentration järn i dricksvatten – en potentiell hälsorisk / Elevated concentration of iron in drinking water – a potential health risk
Iron is an important nutrient, and is included in e.g. haemoglobin. It is excreted in very small amounts. High intake, mainly from Fe in medicines or supplements, may cause bloody diarrhoea, and later acidosis, liver- and kidney damage and heart failure. Fe from drinking water is infrequently discussed. 1. Cows and calves on a farm […]
Om det antika Greklands vattenförsörjning / On the water supply of ancient Greece
The development of the ancient water supply of Greece is described in brief and the central causes for why Greece has so many different technical solutions discussed. The probably most important reason to the multitude of technical solutions is that the city-states in general had a far-reaching independence. Thus, many city engineers could develop their […]
Environmental Technology Verification: a possibility to improve implementation of innovative technologies in the water sector / Verifiering av miljöteknik: En möjlighet att förbättra implementeringen av innovativa vattenreningstekniker
New technologies in the water sector can make treatment processes more efficient at lower total cost and with less environmental impact, but it is often difficult for new technologies to get from research to market. Therefore EU has proposed a number of measures to facilitate uptake of new technologies. One is the implementation of testing […]