Pilot Plant for external sludge handling (Work package 3)
Approximately 50% of municipal residents are connected to the municipal pipeline network system in Höör and Hörby municipalities (Sweden). Other properties have their own sewage disposal plants consisting of sludge separator or closed tank. These plants are emptied by the cleaning company once a year and the sludge (external sludge) goes to the municipal treatment plant for the furher treatment. During recent years the municipality has discovered that there are high metal concentrations in the external sludge delivered to the wastewater treatment plants in Höör and Hörby. As a result, the sludge produced from the wastewater treatment plants is deteriorating. Therefore in the long term perspective can be difficul to find a final sludge disposal.
Studies have shown that metals remains in the sludge in the dewatering of external sludge and the reject water can be treated in the treatment plant without deteriorating the sludge from the wastewater treatment plant.
In the pilot plant, the external sludge is dewatered in a separate plant and only the reject water is discharged to the treatment plant. The dewatered external sludge is handled separately and is not treated with wastewater in the treatment plant. This will cause the sludge produced at the treatment plant to get a better quality with low metal content because it is not polluted by the external sludge. If this pilot gives good experience, a new external sludge reception will be built in the treatment plant where the external sludge is dewatered directly and thus does not charge the treatment plant. The dewatered external sludge from the plant will be landfilled or combusted because it´s contaminated with high metal content.
Photo gallery (Pilot Plant on site):