UPPLAGRING OCH UTTRANSPORT AV FÖRORENINGAR FRÅN EN SYDSVENSK RECIPIENT- EN UNDERSÖKNING AV HÖJE Å / Deposition and Out-transport of Pollutants from a Recipient in south Sweden – A Study of the River Höje å
The present study shows that a substantial part of the pollutants transported in a river reach is deposited in the sediments (14-47 %). Especially a large part of the transported heavy metals copper, zinc and lead seem to be deposited (47 % for zinc). Mass-balance studies of different pollutants are verified by sediment samples. The […]
KARTLÄGGNING AV TOTALT SUSPENDERAT MATERIAL FRÅN GLOMMA ÄLVEN MED SATELLIT DATA / Remote Sensing of Total Suspended Matter from the Glomma River in the Skagerrak
In this study remote sensing techniques have been used to quantify total suspended matter (TSM) in the red part of the electromagnetic spectrum. Data from NOAA-AVHRR are used to demonstrate the temporal change of the Glomma river in the northeastern part of the Skagerrak area, whereas LANDSAT-TM shows the detailed spatial coverage. The technique described […]
ETT OPERATIVSYSTEM FÖR MILJÖKONSEKVENSANALYS FÖR AKVATISKA EKOSYSTEM, An Operative System for Environmental Consequence Analysis for Aquatic Ecosystems
The intention with this paper is to present one type of operative system for environmental consequence analysis (ECA) for natural aquatic ecosystems, i.e. lakes, rivers and marine areas. The operative system consists of two parts: (1) a ”note system” for ECA, i.e., the scientific framework and concepts and (2) the ”instruments”, i.e., the tools which […]
BRÄDDNING – ETT FÖRORENINGSPROBLEM? / Overflow- a Pollution Problem?
A large number of measurements and field studies on the quality of combined sewer overflow discharge quality have been carried out during the recent years. These measurements indicate that commonly used calculation methods for determining the pollution load from combined sewer overflows may greatly underestimate the actual load. This is due to the fact that […]
SEQUENCING BATCH REACTOR (SBR) TESTS ON CONCENTRATED LEACHATES AT LOW TEMPERATURE, VARBERG, SWEDEN
Successful treatment of leachates is often found to be difficult with respect to COD and nutrient removal. This paper presents the results of pilot plant tests carried out in situ at the sanitary landfill, Bösarp, operated by the city ofVarberg. The tests were performed by means of SBR-technics. The results have been very encouraging with […]
ERFARENHETER FRÅN PILOTFÖRSÖK FÖR LÅNGTGÅENDE KVÄVEREDUKTION OCH FOSFORREDUKTION I DANMARK / Experiences from Pilot Tests in Denmark for Efficient Nitrogen and Phosphorus Removal
The demand in Denmark for efficient wastewater treatment has increased dramatically lately. Before 1993 most wastewater treatment plants must meet the effluent quality demand 15 mg/1 BOD, 8 mg/l nitrogen and 1.5 mg/1 phosphorus. This means that the nitrogen removal has to be in the order of 70-80 % also at low wastewater temperatures (6-7°C). […]
EFFECT OF SOLIDS RETENTION TIME ON NITROGEN REMOVAL IN INTERMITTENT CYCLE EXTENDED AERATION ACTIVATED SLUDGE (ICEAS) SYSTEM
The effect of food to microorganism ratio (F:M) on nitrogen removal in intermittent cycle extended aeration activated sludge (ICEAS) system, has been studied using a large pilot scale treatment system. A basic operation schedule for BOD removal was used in the study. The objective of the study was also to develop data that would provide […]
VÄTSKEDOSERING / Liquid Dosing
Dosing is a common unit operation in water and sewage treatment technology. In that connection it is important to choose reliable and accurate equipment. The article describes different automatical dosing systems, different dosing pumps and claims given when selecting dosing systems. It is also important to design the installation in the right way. Examples for […]
THE SIGNIFICANCE OF ICE-COVERS FOR PLANKTONIC ALGAE
Long-term ice-cover occurring on high-mountain and subarctic lakes as well as on brackish-water seas such as the Gulf of Bothnia promotes certain algae species, well adapted to low-light and low-temperature and/ or heterotrophic nutrition. Such algal species often belong to the dinoflagellates. In the northern Bothnian Sea, as in Lake Torneträsk, dinoflagellates are predominant under […]
DAGVATTNETS EFFEKTER PÅ VÄXJÖSJÖN / The Effects of Storm Water on Lake Växjösjön
The aim of the present study was to determine the pollution load originating from storm water on Lake Växjösjön. Each year about 1,050,000 m3 of storm water are discharged into the lake. Storm water represents a substantial pollution source for the lake and therefore also a main reason for the hypertrophic conditions in the lake. […]