Käppala wastewater treatment plant (WWTP) in Lidingö, Sweden, treats sewage from 520 000 pe in the north east part of Stockholm. The Käppala association has done an investigation in cooperation with KTH about different methods to improve nitrogen removal. The main techniques in focus were addition of external or internalorganic carbon and separate treatment of […]
Författare Aleksandra Nikolic´ och Anna Maria Sundin
A pilot-plant study, made to clarify whether biological denitrification is a possible and suitable method for nitrate reduction of drinking water in Sweden is presented. The concentration of nitrate-nitrogen in un-treated water was 10–15 mg/l. The reactor was a 1.2 m aluminium tube with a inner diameter of 0.19 m. 0.75 m was filled with […]
Författare Niklas Persson, Jes la Cour Jansen och Kenneth M Persson
Nyckelord (Keyword) Biological denitrification, nitrate reduction, drinking water, potable water
Pre-treatment of sludge before anaerobic digestion can increase methane production and degradation of organic matter. There are various pre-treatment methods for this purpose. Anaerobic digestion tests were performed for comparison of three pre-treatment methods (hygienisation, ultrasonic treatment and enzyme dosing) usedseparately or in combination on biosludge and mixed sludge. COD solubilisation and methane potentials from […]
The article discusses how knowledge has been accumulated by water engineers for optimizing the size of water reservoirs in drinking water supply systems. The most important knowledge for proper sizing has always been to know the water demand. How much water is consumed per day in the net-work? Second most important fact is the production […]
Författare Kenneth M Persson
Nyckelord (Keyword) Water towers, water reservoirs, water history, Sweden
An onsite wastewater treatment plant at Brändön, north of Luleå, receiving primarily treated wastewater from a village, was operated and investigated during one year. The wastewater flow was 0.5 m3/d. The main treatment steps were a prefilter, mainly to distribute the flow, a vegetation filter consisting of two different clones of Salix and two phosphorus […]
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