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 […]
Författare ERIK SÄRNER, CHRISTER JONASSON och MICHAEL PETERSSON
Nyckelord (Keyword) wastewater treatment, biological phosphorus removal, sludge hydrolysis.
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 […]
Författare ERIK GRÖNLUND, ERICA JOHANSSON, JÖRGEN HANÆUS2 & STEFAN FALK
Nyckelord (Keyword) phytoplankton, sewage, oxidation pond, lagoon, fellingsdam, cold climate, EC directive.
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- […]
Författare HELENA PALMQUIST
Nyckelord (Keyword) Wastewater management, SFA, hazardous substances, metals, barrier, chemical risk assessment.
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 […]
Författare MAGNUS HALLBERG och GUNNO RENMAN
Nyckelord (Keyword) Highway runoff water, storm water, initial flow pulse, Polonite®, sedimentation, sludge.
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 […]
Författare NASIK AL-NAJJAR och BENGT HULTMAN
Nyckelord (Keyword) Iraq, sewage treatment, water administration, water conflicts, water treatment.
ACCUMULATION AND DISTRIBUTION OF PAH AND PCB IN DIFFERENT PARTICLE SIZE FRACTIONS OF CONTAMINATED MARINE SEDIMENTS
The accumulation and distribution of PAH and PCB in different size fractions of contaminated sediments from The Norwegian Fjord Sandefjord and the bioaccumulation of these contaminants in sediment reworkers have been studied using dredged sediments.The sediment reworker Corophium volutator (a sediment reworker included in OSPAR’s toxicity test battery for chemicals used and discharged offshore in […]
Författare LARS J. HEM1, EILEN A. VIK, HANS-JACOB SVENSEN, and TORE LUNDH
Nyckelord (Keyword) PAH, PCB, bioavailability, bioaccumulation, Corophium volutator, fractioning, distribution, contaminated sediments, particle size.