Att dimensionera vattentorn / To design water towers
The article discusses how knowledge has been accumulated by water engineers for optimizing the size of water reservoirs in drinking water supply systems. The most important knowledge for proper sizing has always been to know the water demand. How much water is consumed per day in the net-work? Second most important fact is the production […]
Pre-treatment of wastewater sludge before anaerobic digestion – Hygienisation, Ultrasonic treatment and Enzyme dosing
Pre-treatment of sludge before anaerobic digestion can increase methane production and degradation of organic matter. There are various pre-treatment methods for this purpose. Anaerobic digestion tests were performed for comparison of three pre-treatment methods (hygienisation, ultrasonic treatment and enzyme dosing) usedseparately or in combination on biosludge and mixed sludge. COD solubilisation and methane potentials from […]
Biologisk denitrifikation av dricksvatten / Biological denitrification of drinking water
A pilot-plant study, made to clarify whether biological denitrification is a possible and suitable method for nitrate reduction of drinking water in Sweden is presented. The concentration of nitrate-nitrogen in un-treated water was 10–15 mg/l. The reactor was a 1.2 m aluminium tube with a inner diameter of 0.19 m. 0.75 m was filled with […]
Teknik för förbättrad kväverening i Sverige – Resultat av landsomfattande enkätundersökning / Methods for improved nitrogen removal in Sweden – results from a questionnaire survey
Käppala wastewater treatment plant (WWTP) in Lidingö, Sweden, treats sewage from 520 000 pe in the north east part of Stockholm. The Käppala association has done an investigation in cooperation with KTH about different methods to improve nitrogen removal. The main techniques in focus were addition of external or internalorganic carbon and separate treatment of […]
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A geochemical analysis of leachate plumes from two abandoned landfills. Present and long-term effects on groundwater
Groundwater samples have been taken from two abandoned landfills Måsängen and Lackalänga in Kävlinge community. The results show that groundwater from Lackalänga is a mixture of reduced and oxidized waters due to above-normal iron, manganese and ammonium as well as high nitrate and sulfate concentrations. Meanwhile, high bicarbonate buffers the pH between 7.7 and 8. […]
Reactive Filter Systems for Small Scale Wastewater Treatment – A literature review
The objective of this study was to outline via a literature review reactive filter systems for small scale wastewater treatment. Phosphorus and ammonium sorption were considered. Different reactive filter materials have been studied in a laboratory, though few in full-scale. The lightweigh clay aggregate product Filtralite P and Nordkalk Filtra P are the materials most […]
Utslipp av drivhusgassene N2O og CH4 fra sandfiltre og konstruerte våtmarker i sør-Norge / Emission of the greenhouse gases n2O and Ch4 from sand filters and constructed wetlands in south-east norway
This article reports about flux measurements of CH4 and N2O from two types of constructed wetlands in south-eastern Norway, a free surface water (FSW) wetland polishing chemically treated municipal wastewater and a meso scale sub-surface flow (SSF) wetland receiving wastewater from a single domestic household. Fluxes of both gases had a large temporal and spatial […]
Redusert avrenning fra urbane felt – Et eksempel på lokal overvannshåndtering / Restoration of the hydrological regime after urban development
Urbanization of a watershed increases the volume and peak discharge of runoff. This paper shows how the use of low impact development (LID) best management practices (BMPs) influences site hydrology by comparing two newly established residential areas in Connecticut, USA. The watersheds were 2.0 and 1.7 ha for the traditional storm water management and LID […]
Odorous wastewater emissions
The objective of this article is to review odour problems of wastewater treatment facilities and air emission treatment methods. The malodorous wastewater emissions consist of a complex mixture of substances with different properties. A screening of volatile organic and reduced sulphur compounds revealed very low concentrations of individual compounds (< 50 ppb), and only dimethyl […]