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The waste water treatment plant in Mindelo is oversized, with high evaporation and increasing salinity in the effluent water as a result. By subdividing the ponds with a plastic barrier, a much smaller volume is needed to achieve acceptable bacterial concentrations in the effluent water. The technique of subdividing ponds with a plastic barrier is […]

A wetland area, including 22 ha of shallow ponds, channels and Inundated fenlands, has been created during 1993 adjacent to the town of Oxelösund (12500 inhabitants) on the Baltic coast of Sweden. The primary goal with the wetland is an annual removal of 22 tonnes of nitrogen from pretreated wastewater from the towns treatment plant. […]

Samples of incoming raw sewage vater have been collected on a five day basis every week during six months, and analyzed for seven heavy metals. A few determinations of other elements have also been made. These data have been combined with the results of the compulsory analytical control of effluent water and sludge to calculate […]

There is an increasing need for rapid sandfilters in sewage treatment plants due to more stringent requirements on the quality of the treated water. Besides sandfilters could possibly be used for other treatment processes such as chemical precipitation or denitrification. These factors imply a heavy load of suspended particles on the sandfilters making the flushing […]

Experiments with nitrification of reject water by use of SBR technics at Bromma sewage treatment plant have shown that it is possible to obtain a complete nitrification at high reaction rates. The oxygen concenration was the main operational parameter that mfluenced the nitrification rate. Moreover the initialammonium concentration had a certain influence. The experiments showed […]

By order of the Environment and Health Committy in the Community of Ljusnarsberg and as a part of the Community’s work for public health the Environment and Health Department has, during 1992, made an inquiry about the consumption habits of inland sea fish among sports fishermen living in the Community of Ljusnarsberg. The purpose of […]

Copper is a common material in building plumbing system. Copper pipes corrode in different ways wich have consequences for the useful life of the pipe and also for water quality. From a water quality point of view, the uniform corrosion is of imponance. This type of corrosion, resulting in high copper content, is common at […]

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 […]

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 […]

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 […]