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Report, 1998

Dubbelspolande urinsorterande toaletter

Burström, Anna; Jönsson, Håkan


Urine separation is a complementary function to the sewage system. Some people believe that it is the best way to close the cycle of nutrients between urban and rural areas. In order to study the experiences of the users of urine separating sewage systems an inquiry was made among such users in five different housing districts. Three districts were equipped with the DS-toilet from WM-Ekologen AB. The other two districts were equipped with the toilet Dubbletten from BB-Innovation & Co AB. In the inquiry the users were asked about odour, cleaning, design of the toilets and how they handled toilet paper after urination. Other questions treated the users opinion of urine separation toilets and the future of the system. A purpose of the inquiry was to find out how often the urine pipe got blocked, what the blockages consisted of and how hard they were to clear. The inquiry showed that urine separation toilets smelled just a little more then conventional ones. Some families had initially had large odour problems. This was often a result of faulty installation and when the installation was fixed, the odour had disappeared. However, a few families still found that the urine separating toilets smelled somewhat more than conventional ones. The difference was small and thus odour was not a large problem. Of the two studied urine separating toilets, one required more cleaning and one less than a conventional toilet. One problem was that faeces frequently got stuck onto the porcelain. The flushing of the urine bowl of the toilet did not function well on either of the toilets. This should not be difficult to improve, but product development is required. The users were asked to grade their confidence in a future expansion of urine separating sewage systems using grades from one to six. Grade one meant that the system did not have a future and grade six meant that it would become widespread. The average grades of the users in the different districts were between 4,l an 4,6. The majority was also positive to having urine separating toilets in their homes, average grades were above 5,4 in all districts except one, Palsternackan, where the average was 4,9. The most serious problem with the urine separating toilets was the frequent blockages of the urine pipe on the toilet itself. Most of the blockages, 77 % of the ones studied, originated from hair or straws from toilet brushes. These blockages were easy to clear. However, there were also a few blockages that were impossible to clear with our equipment. These blockages consisted of a hard precipitation containing large proportions of phosphorus, calcium, magnesium and, where the urine pipe was of copper, also copper. The inquiry showed that after 4 000 estimated toilet usages only three households, out of 96, had not had any blockage of the urine pipe. In two districts the pipes of the urine sewage system were further investigated. Where the pipe had a diameter on ll0 mm and a slope of 1 cm per meter, there was almost no sludge in the pipes and no sign of any future blockage problem. Pipes with a diameter of 50 mm and pipes with less slope than l % contained much sludge. The sludge was easy to flush away with water. We regret that it was not possible to make any observation of pipes with diameters between 50 and 110 mm having a l % slope.


funktion; stopp; urinledning; rensning; åtgärd; urin; acceptans; städning; spolning; brukare; lukt

Published in

Rapport - Sveriges lantbruksuniversitet, Institutionen för lantbruksteknik
Publisher: Institutionen för lantbruksteknik, Sveriges lantbruksuniversitet

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