IMPLICATIONS OF ECOLOGICAL SUSTAINABILITY FOR URBAN WATER MANAGEMENT / Vad innebär ekologisk hållbarhet för VA-systemen?
One of the main issues ot the research programme ”Sustainable Urban Water Management” (UW), which is funded by the Swedish Foundation for Strategic Environmental Research (MISTRA), is if existing urban water management is sustainable and what measures may be undertaken if it is not. This paper focuses on the ecological dimension of sustainability and its […]
EJEKTORLUFTNING AV JÄRNHALTIGT GRUNDVATTEN Del 1. Teori och Karaktärisering / Ejector aeration of iron containing ground water Part 1. Theory and laboratory evaluation
The purpose of ground water aeration is mainly to remove unwanted gases and impurities as well as improve the oxidation of iron and manganese. A commercial ejector aerator was characterized in laboratory and field and the performance was compared in field studies with other aeration methods used in full scale in water-works. This evaluation was […]
BRA SMÅ AVLOPP En utvärdering av anläggningar för enskilda avlopp / Evaluation of small wastewater treatment systems
The purpose of the project ”Bra Små Avlopp” or ”Small Well functioning Sewage plants” was to evaluate and demonstrate new solutions for decreasing the discharges from on site wastewater treatment plants. Seven of the investigated facilities were package plants, two were urine separating plants with large sand filters, two had septic tanks to collect wastewater […]
CONSTRUCTED WETLANDS FOR TREATMENT OF LANDFILL LEACHATE – EXPERIENCES FROM SWEDEN AND NORWAY / Konstruerade våtmarker för behandling av lakvatten – erfarenheter fran Sverige och Norge
Constructed wetland systems have attracted attention as suitable methods to treat landfill leachate. Experiences are promising in several European countries and in the North America, but Swedish experiences are limited so far. There is an interest for this solution also in Sweden and a number of constructed systems have recently been established. The aim with […]
DEAMMONIFIKATION SOM EN NY PROCESS FÖR BEHANDLING AVAVLOPPSSTRÖMMAR MED HÖG KVÄVEHALT / Deammonification as a new process for treatment of wastewater with a high nitrogen content
Pilot plant-scale experiments have been carried out to study a new technology for nitrogen removal from digester supernatant. The plant comprises two parallel lines, which now operate as a two-step process. Two pilot plant reactors (each volume of 2 m3) were filled with Kaldnes rings up to 50 % of their volume. In the First […]
MONITORING OF NITROGEN REMOVAL PROCESSES BY USE OF CONDUCTIVITY MEASUREMENTS / Övervakning av kvävereduktionsprocesser med hjälp av konduktivitetsmätningar
A newly developed technology for nitrogen removal from ammonium-rich streams comprises two biological steps. In the first step, about half of the ammonium is oxidized to nitrite (partial nitritation) and in the second one, the remaining ammonium reacts with the formed nitrite into nitrogen gas (Anammox; anaerobic ammonium oxidation). The system was studied in a […]
MAPPING OF GROUNDWATER DISCHARGE AREAS / Kartering av utströmningsområden
Detailed knowledge of groundwater discharge areas is needed, among others, in those cases where polluted groundwater may threaten surface water quality. We present a method of studying the discharge areas by sampling shallow groundwater with mini-piezometers and measuring water conductivity and/or hydraulic head. Two case studies from the rivers of Björkaån near Sjöbo and Braån […]
OPTIMISATION OF OPERATION AND REDUCTION OF LEAD CONCENTRATION IN THE LEACHATE TREATMENT PLANT AT SPILLEPENG LANDFILL, SWEDEN / Optimering av en lakvattenreningsanläggning för blyfällning vid Spillepeng
The possibility to optimize a landfill leachate treatment plant in order to reduce the lead content by precipitation has been investigated. The precipitation takes place when an ash cell leachate is mixed with a biocell leachate in a treatment plant. The influence of precipitation by pH, leachate flows and aeration was studied. Standard operational conditions […]
BERÄKNING AV KOSTNADER FÖR MINSKAD KVÄVEBELASTNING PÅ EGENTLIGA ÖSTERSJÖN / Costs of reducing nitrogen loads to Baltic Proper
Sweden has implemented measures for reducing nitrogen loads to the Baltic Sea since the beginning of 1980s with an aim of doing this in a cost effective way. Cost effective nitrogen reduction is defined as minimum cost for achieving prespecified nitrogen reductions. The costs of measures are then determined by the cost at the location […]
FLAGELLATEN EUGLENA GRACILIS RÖRELSEFÖRMÅGA KAN AVSLÖJA GRADEN AV GIFTIGHET (KADMIUM) I VATTEN MED HJÄLP AV MÄTMETODEN ECOTOX / Assessing Euglena gracilis motility using the automatic biotest ECOTOX application to evaluate water toxicity (cadmium)
The interest in testing of water and wastewater for toxic compounds has increased in the last few years with rsing pollutant levels from industry and with rising sensibility towards environmental problems. In order to get an early warning signal of environmental conditions the use of unicellular organism are recommended since they respond quickly and are […]