| Agricultural utilization of sewage sludge from wastewater treatments plants becomes more difficult due to regulation. Main reasons are harmful contents like heavy metals, organic compounds (pesticides, PCBs, halogen compounds) and human, animal or plant pathogens (hormones, antibiotics). | Preferred and environmentally sound solutions are incineration in dedicated plants or recultivation in former clay quarries or as recultivation layer on landfills as substitution for organic raw materials. |
