In order to reduce the red water problem in Göteborg, water quality was changed with respect to alkalinity and hardness. The raw water is very soft. By adding lime and carbon dioxide in the end of the water treatment process alkalinity is increased from 18 to 60 mg hydrogen carbonate/1. At the same time the […]
Unhealthy indoor climate in residential buildings has been the subject of intensive research in recent years, the purpose being to find the cause and to minimize health risks. One factor that has come under attentions radon and its decay products which when inhaled may give rise to lungcancer. Radon in drinking water can be a […]
Trickling filters are normally considered to be difficult to use in systems designed for nitrogen removal. If the load of organic substances is low or can be reduced to a sufficiently low level, a trickling filter can however be used for nitrification and denitrification can be obtained in a succeeding denitrification process. This might be […]
It has been found in several studies that the sludge settleability may deteriorate when a biologicai nutrient removal process is applied. However, so far only a few studies on the sludge characteristics at Swedish wastewater treatment plants with biological nutrient removal have been reported. A rwo-year study (august 1991-july 1993) at the Sjölunda wastewater treatment […]
Författare HANS CARLSSON, NATUSCKA LEE and THOMAS WELANDER
At Bromma wastewater treatment plant experiments have been performed with nitrification of reject water by use of SBR technology (Sequencing Batch Reactor technology). Obtained results have shown that the sludge has good sedimentation properties and a high proportion of nitrifying bacteria. It was possible to decantate in pilot plant studies at least 40 % of […]
New legislation in Sweden will lead to the elimlnation of landfills as a disposal method tor sewage sludge and new alternatives are under investigation. By employing thermal hydrolysis and separation techniques the sludge can be split into new components that have a market value which exceeds the value of their use as fertiliser. The process […]
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