NATURVÅRDSVERKETS VATTENPROJEKT – ATT FÖRBEREDA OSS INFÖR ETT VATTENARBETE MED RAMDIREKTIVET FÖR VATTEN / The Water Project at Swedish EPA – getting ready for the EU Water Framework Directive
In VATTEN issue number 2, 1999, there was an article about the, at the time, newly started Water Project at the Swedish Environmental Protection Agency. That project, which was completed after two years, had as its overall objective to prepare Sweden for the new EU Water Framework Directive. The present paper describes the review of […]
KEMIKALIEBEHOV VID FOSFORUTVINNING UR AVLOPPSSLAM / Chemical Needs in Phosphorus Recovery from Sewage Sludge
A study concerning recovery of phosphorus from sludges and ashes has been performed as a cooperation project between Stockholm Water Co and the division of Water Resources Engineering at The Royal Institute of Technology. A model for calculation of the chemical demands for recovery of phosphorus using the commercial systems KREPRO, Cambi/KREPRO and BioCon has […]
CHEMICAL COMPOSITION OF SURFACE WATERS IN LATVIA – ANALYSIS OF INFLUENCING FACTORS
Chemical composition of surface waters (lakes and rivers) of Latvia has been studied. The relationship between water composition, formation factors and human impact has been compared. Aquatic chemistry has been found to be controlled both by land-use pattern, human impact and hydrological factors, but in varying: extent for different water bodies. The possible sources of […]
EUROPEAN WATER HISTORY FROM A SWEDISH VIEWPOINT: INTRODUCTION OF MODERN WATER AND SEWER SYSTEMS IN NORRKÖPING AND LINKÖPING 1860-1875 / Europeisk vattenhistoria från en svensk synvinkel. Introduktionen av moderna vatten- och avloppssystem i Norrköping och Linköping 1860-1875
This article explores the origins of our ”piped society”, from the point of view of water and wastewater technologies. Modern water and sewer systems proliferated in Europe in the late 19th century, and the aim of article is to investigate into the reasons for the rapid spread of these urban sanitary technologies, and especially the […]
HUR MÄTER MAN REDOXPOTENTIALEN PRAKTISKT OCH VARFÖR BLIR DET INTE RÄTT? / How to measure the redox potential and why it often fails
The redox condition is an important factor controlling e.g. the mobility of compounds in groundwater. Reliable measurements of redox potentials in water are problematic to perform for a number of reasons. A fundamental reason is that natural waters are seldom, if ever, in a state of redox equilibrium. Each redox couple has its own potential […]
CONTROLLING NITROGEN REMOVAL USING REDOX AND AMMONIUM SENSORS
Redox sensors have been in use at the wastewater treatment plants in Odense, Denmark since 1990 Starting in April 2000 at the Northeast WWTP the signals from ammonium and redox sensors have been employed for the automatic control of the nitrogen removal process. This resulted in a reduction of the effluent total nitrogen concentration from […]
USE OF MICROALGAE IN WASTEWATER TREATMENT IN COLD CLIMATE / Användning av mikroalger vid avloppsvattenbehandling i kallt klimat
The following article is a literature review on possibilities of microalgal improvement of wastewater treatment in oxidation ponds in cold climate. Furthermore the paper covers the possible commercial microalgal products that can be produced using the nutrient resource in the wastewater. Very few investigations have been performed in cold climate. There is evidence that microalgal […]
INTERNATIONAL SLUDGE MANAGEMENT REGULATIONS AND PRACTICES / Slamhantering i ett internationellt perspektiv
This paper is based on a literature survey concerning current regulations and general practices of sludge use and disposal in the United States, European Union (in particular Sweden) and Chile. Almost all regulations analysed in this paper require relatively similar hygienisation procedures. Besides being based on the hygienisation method applied, some restrictions are related to […]
STUDIER AV SAMVERKAN MELLAN AVLOPPSVERK OCH LEDNINGSNÄT Del 2. Modelltillämpningar / Integrated Analyses of Sewer Systems and the Wastewater Treatment Plant – Experience from three Swedish Applications Part 2. Applications
Demonstration studies were accomplished in the cities of Helsingborg, Halmstad and Sundsvall as part of the Technology Validation Project (TVP) ”Integrated Wastewater” (1997-2000). All three projects were focused on the analyses of the interaction between the sewer system and the wastewater treatment plant under variable operational conditions, created by the application of real-time control (RTC) […]
STUDIER AV SAMVERKAN MELLAN AVLOPPSVERK OCH LEDNINGSNÄT Del 1. Bakgrund och uppbyggnad av delmodeller / Integrated Analyses of Sewer Systems and the Wastewater Treatment Plant – Experience from three Swedish Applications Part 1. Background and model assumptions
Three Swedish pilot projects have been carried out as part of the Technology- Validation Project (TVP) ”Integrated Wastewater” (1997-2000), supported by the European Commission. The overall objective of the TVP project was to develop and validate an integrated methodological and technological framework for the pollution impact analyses of complete urban Wastewater systems on the receiving […]