VA-SITUATIONEN I IRAK – PROBLEM OCH MÖJLIGHETER TILL MOTÅTGÄRDER / Water and Wastewater Situation in Iraq – Problems and Possibilities for Counter-measures
A summary is given on the water and wastewater situation in Iraq before the Gulf war 1991, the situation after the Gulf war and the recent effects of the conflict 2003. The access of safe water was halved in certain counties after March 2003 and half of the sewage works was out of function with […]
FÖRSEDIMENTERING OCH FILTER VID DAGVATTENRENING I FÖRORENINGSBELASTADE OCH TRAFIKTÄTA OMRÅDEN / Pre-sedimentation and filter for stormwater treatment in traffic dense areas with high pollution load
The EU Water Directive (2000/60/EG) refers to 1991/271/EEC in regards to runoff water (storm water) as a type of sewage water. The EU Water Directive also points out the urban road runoff water as a pollutant source for ground water. Elevated levels of pollutant concentrations can be found in runoff water from catchment areas with […]
SUBSTANCE FLOW ANALYSIS OF HAZARDOUS SUBSTANCES IN A SWEDISH MUNICIPAL WASTEWATER SYSTEM
In a comparative substance flow analysis two wastewater management scenarios in the Swedish town of Surahammar were assessed – a Conventional Scenario vs. a Separating Scenario. The study was restricted to a selection of 16 representative hazardous substances, including metals and organic compounds. Quantitative data of the selected hazardous substances – their presence in grey- […]
SEASONAL MICROALGAE VARIATION IN A SUBARCTIC WASTEWATER STABILIZATION POND USING CHEMICAL PRECIPITATION
Surface water microalgae samples were collected during the ice-free period in a small subarctic wastewater stabilization pond system, complemented with chemical precipitation during the winter period (fellingsdam), and serving 310 persons. In the primary pond microalgae dominance alternated between the CryptophyteCryptomonas and green algae (Chlorophyta). In the second and third pond the general pattern was […]
HYDROLYS AV RETURSLAM FÖR FÖRBÄTTRAD BIOLOGISK FOSFORAVSKILJNING / Hydrolysis of return sludge for improved biological phosphorus removal
High demands for phosphorus removal in Sweden result in extensive use of chemicals for precipitation. This has a negative environmental impact. A way to reduce or eliminate the use of chemicals is to use biological phosphorus removal. However, municipal wastewaters normally contain too low concentrations of easily biodegradableorganic substances to make this process work satisfactory.One […]
EVALUATION OF LABORATORY BATCH TESTS FOR ENHANCED BIOLOGICAL PHOSPHORUS REMOVAL
Phosphorus release batch tests can be used for evaluation of an activated sludge process with enhanced biological phosphorus removal (EBPR or bio-P). The test method is described and different aspects of the result evaluation are discussed. The concentration of dissolved phosphorus in a sample from the activated sludge is followed during an anaerobic period within […]
STRATEGI FÖR FRAMTIDA BEHANDLING AV SPILLVATTEN FRÅN GETINGE I HALMSTADS KOMMUN / Strategy for future treatment of sewage water from the village Getinge in the community of Halmstad, Sweden
The strategic choice between different future solutions of sewage treatment in the area and village of Getinge has been evaluated from economical and environmental viewpoints. The study could identify three alternative solutions for the treatment of the sewage, which were compared from operational, economical and environmentalpoints of view. The first alternative, A, described the present […]
DRICKSVATTENFÖRSÖRJNING I GLASGOW, LONDON OCH ÖVRIGA STORBRITANNIEN 1800–1850 – EN ÖVERSIKT / Drinking water supply in Glasgow, London and other parts of Great Britain 1800–1850 – a review
The development of drinking water supply in the early industrial cities in Great Britain is reviewed. The special feature of slow sand filtration, that was developed in Glasgow in the very beginning of the 19th century and diffused to the rest of Great Britain during the first half of the 19th century is described in […]
SHORT TERM CHEMICAL TREATMENT OF BIOLOGICAL SLUDGE WITH FILAMENTOUS ORGANISM TYPE 021N
When sludge bulking occurred in the new wastewater treatment plant for the abattoir in Kalmar, a quick solution to inhibit and harm the filamentous organism Type 021N was to be found. Five different kinds of chemicals (NaOCl, H2O2, FeCl3, PAX-XL60 and Ecofloc) were tested in two short term lab-tests. Each chemical was first tested with […]
INTEGRATION AV VÅTMARK I ETT MODERNISERAT AVLOPPSRENINGSVERK, MÖJLIGHETER OCH BEGRÄNSNINGAR / Integration of a constructed wetland with an upgraded treatment plant, perspectives and limitations
Nynäshamn community has upgraded the main wastewater treatment plant by adding an activated sludge stage, in order to handle septic sludge emanating from the southern suburban area of Stockholm. The upgraded plant was taken into operation in 2003.The plant was earlier based on a treatment chain containing pre-treatment, chemical precipitation and a constructed wetland. The […]