PROCESS OPTIONS AT A SEWAGE PLANT WITH 3-SLUDGE BIOLOGICAL NITROGEN REMOVAL AT INCREASING PLANT LOADS
Methods for biological nitrogen and phosphorus removal in domestic wastewater have been developed to a great extent during the last two decades. Thus, it is desirable to design a sewage treatment plant in a flexible way in order to change the mode of operation particularly in an area with rapid population growth. Sunbury Sewage Treatment […]
REDUKTION AV TILLVÄXTBEFRÄMJANDE ÄMNEN VID VATTENVERKET BORG I NORRKÖPING / Reduction of Bacterial Growth Potential in Drinking Water Treatment Processes in Norrköping, Sweden
Measurements of bacterial growth potential were carried out in the drinking water treatment plant and distribution net of the city Norrköping, Sweden. The growth of bacterial biomass was measured with two specific bacterial strains, Pseudomonas fluorescens strain P17 and Aeromonas hydrophila M 800, and with the indigenous bacterial population found in the raw water of […]
EFTERDENITRIFIKATION I SANDFILTER Försök i ett DynaSand-filter / Denitrification in a DynaSand Filter
Denitrification tests with a DynaSand filter have been performed at the Klagshamn sewage treatment plant in Malmö. Effluent wastewater from a nitrifying activated sludge plant was treated in a filter with a surface area of 0.7 m2 and a sand bed depth of 2 m. The grain size of the sand was between 2 and […]
SAMPLING TECHNIQUES – IMPLICATIONS IN ESTIMATING SUBSTANCE TRANSPORTS FROM SMALL WATERSHEDS
Loads of phosphorus, nitrogen and CODMn have been estimated on an annual basis from two nearby watersheds in central Sweden. The computations were performed according to the following five techniques: 1.Momentary analysis of concentration together with discharge measurements in the middle of a bimonthly period. 2. Momentary analysis of concentration as above but with measurements […]
PROBLEMS WITH THE DETERMINATION OF LIGNIN DERIVATIVES IN EFFLUENTS FROM BLEACHED KRAFT PULPING
Most methods for determination of lignin derivatives in effluents and recipient waters are based on photometric measurements directly or after colour reactions with the phenolic hydroxyl groups. These methods are critically discussed. In applying the methods it is assumed that the character of lignin derivatives is aromatic. This is the case for lignin derivatives of […]
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 […]
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 […]