According to the latest EU Sewage Sludge Ordinance, phosphorus must be recovered from sewage sludge. This is to prevent that waters are burdened with too much phosphorus. In addition, phosphorus is to be recovered for reuse in agriculture. Söll has the strongest phosphorus binder in the world, which is protected by a worldwide patent. As a result, a unique method for phosphorus recovery for wastewater treatment plants, which impressively exceeds all other existing or planned methods in terms of value for money.

Söll has developed a patented method that can increase the capacity of existing wastewater treatment plants, without structural enlargement, by up to 100%. In addition, this method usually reduces sewage sludge volumes and improves effluent values. The results have already been proven in a major international project.