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The low-input methods of processing sewage sludge are characteristic first of all by their simple design and technology as well as by their easy operation. These methods allow using only a limited number of process equipment resulting on low consumption of electrical energy. Utilisation of natural processes occurring in the environment allows maintaining low operation costs. Reed lagoons are successfully used for the long-term stabilization and dehydration of sludge from waste water treatment. They are easy to construct and operate and consume small amounts of energy [Zwara & Obarska-Pempkowiak 2000; Nielsen et al. 2012]. What is perhaps the most important in STRB is that any kind of sewage sludge of organic character can be stabilized [Uggetti et al. 2010]. This technology has been applied with success for more than thirty years, among others in Denmark. The initial content of organic matter in the sediment between 50% and 65% and low load of the lagoon surface allow for drainage of sewage sludge to a degree no less as when using filter presses up to the value of 20–30% DM [Nielsen 2003, 2011; Nielsen et al. 2012]. Reed lagoon is compulsorily equipped with a drainage system that allows ventilation of the processed sewage sludge and effluent discharge. The efficiency of dehydrating is also provided by gravity drainage and evaporation. In addition, the long process of sludge stabilization (7–15 years) Journal of Ecological Engineering Received: 2018.03.02 Accepted: 2018.05.15 Published: 2018.07.01 Volume 19, Issue 4, July 2018, pages 75–87

Changes of the Content of Heavy Metals and PAH’s in Sewage Sludge Treated with Reed Bed Lagoons