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 […]
SVARTVATTENSYSTEM I HAMMARBY SJÖSTAD? – Systemanalys och förslag på utformning av system / Blackwater treatment system in Hammarby Sjöstad? – System analysis and design
As a part of the environmental programme for Hammarby Sjöstad, a separate system for blackwater and organic household waste has been considered. Four different systems have been compared using a system analysis approach. Design issues considered were source separation of urine, use of vacuum toilers, and advanced nutrient recovery processes such as Reverse Osmosis (RO). […]
EJEKTORLUFTNING AV JÄRNHALTIGT GRUNDVATTEN Del 2. Jämförelser mellan olika fullskaleluftningsmetoder / Ejector aeration of iron containing ground water Part 2. Comparison between different full scale aeration methods
The purpose of ground water aeration is mainly to remove un-wanted gases and impurities as well as improve the oxidation of iron and manganese. In the field tests, the ejector aeration was compared with an INKA- aerator, a membrane-aerator, a droplet-aerator and a cascade-aerator. The different aerators performance as oxygen transfer efficiency [%], aeration efficiency […]
THEORETICAL ENERGY REQUIREMENTS FOR HYDROPONIC WASTEWATER TREATMENT / Teoretiskt energibehov för hydroponisk avloppsrening
Hydroponic wastewater treatment takes advantage of the nutrient removing capacity of green plants. In addition to the nutrient assimilation, the roots provide a growth substrate for microorganisms involved in the biological treatment processes. However, to maintain year-round performance by the plants, additional energy muse be provided at higher latitudes, even if the hydroponics are situated […]
NEW TREATMENT OF HARD DRINKING WATER – INFLUENCE ON COPPER CONTENT AND ORGANIC MATTER / Ny dricksvattenbehandling – inverkan på kopparutlösning och organiskt material
Hard drinking waters give problems in several respects. The copper content can be > 2 mg/l after stagnation. The use of detergent is increased and discouloration can occur. Uppsala water work has developed a process to decrease the alkalinity and hardness of the water in a way that does not use special chemicals. The process […]
VILKEN ÄR NYTTAN MED ÖRBY INFILTRATIONSVERKSAMHET FOR VÄSTRA SKÅNE? En systemanalys …/ What are the benefits of The Örby recharge activity to the western region of Scania? A system analysis …
The Örby field is located right south of the city Helsingborg in southern Sweden. This field contains inter alia a water recharge activity and housing areas. Municipalities, like Helsingborg, are responsible for ensuring a balance both in the supply of water as well as dwellings. On the Örby field this leads to a conflict of […]