SEQUENCING BATCH REACTOR (SBR) TESTS ON CONCENTRATED LEACHATES AT LOW TEMPERATURE, VARBERG, SWEDEN
Successful treatment of leachates is often found to be difficult with respect to COD and nutrient removal. This paper presents the results of pilot plant tests carried out in situ at the sanitary landfill, Bösarp, operated by the city ofVarberg. The tests were performed by means of SBR-technics. The results have been very encouraging with respect to organic, phosphorus and nitrogen removal, including operation at very low leachate temperatures. Typical BOD removals exceeded 99 %. Excess phosphorus was removed by means of simultaneous precipitation to less than 1.5 ppm and to less than 0.5 ppm in filtered samples. Nitrogen removal varied from about 75 % to 95 %. The results encouraged Varberg to design a full size SBR-plant for the future treatment of leachates.