Abstract
About 70 % of the total number of advanced (biological, chemical or biological/chemical) wastewater treatment plants in Norway are small (100 - 2000 PE). More than half of the small plants (55 %) are based on biological/chemical treatment. Simultaneous precipitation and post precipitation based on the activated sludge process is dominating even if systems based on biofilm processes are gaining more and more popularity. The State Pollution Control Authority has made recommendations on design of small wastewater treatment plants. Two systems are recommended; one based on a low loaded activated sludge process with querning of particulate matter as pretreatment and with a separate waste sludge holding tank, and one based on a low loaded biofilm system (biofilter, RBC, etc.) with a large septic tank serving both as pretreatment and waste sludge holding tank.
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