EDTA-REDUKTION I EN MULTIBIOANLÄGGNING / EDTA-Reduction in a Multibio Plant
A pilot plant study with biological treatment has been carried out at Mörrum Bruk. The pilot plant was built as the future external treatment plant, a multistage biology or a so-called Multibio. The total retention time in the biological stages was slightly more than 7 hours. The volume load was about 5,5 kg COD/m3 d. […]
ALTERNATIVA ÅTGÄRDER FÖR MINSKAT INLÄCKAGE AV GRUNDVATTEN I AVLOPPSSYSTEM – PROGNOSTISERING AV EFFEKTER MED STÖD AV INTEGRERAD MODELLERING / Alternative Schemes for Reduction of Groundwater Inflow/Infiltration to Sewer Systems – Prediction of Effects with the Aid of Integrated Sewer/Aquifer Modelling
Sewer systems influence the local urban hydrology rhrough infiltration ofgroundwarer. Experiences indicate a limited use of traditional countermeasures for limiting the inflow/infiltration. Implementing alternative schemes introduces on the other hand many new technical issues. The answers to these demand a thorough geohydrological understanding of the catchment. The ability to describe this complex interaction and to […]
SLAMFÖRBRÄNNING OCH – ÅTERVINNING I JAPAN / Sludge Incineration and Reuse in Japan
Sludge incineration has been used in Japan for the last 30 years, as a method to reduce the sludge volume and to destroy organic pollutants. Today, incineration is conducted mainly in conventional fluid bed incinerators, however there is a shift towards the use of circulating fluid bed incinerators instead. The occurrence of dioxins is very […]
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 […]