Recycled sewage sludge as part of organic-mineral fertilisers – a comprehensive solution to the use of local raw materials

Introduction Nowadays, the problem of municipal wastewater sludge treatment and disposal has high ecological and economic significance [1]. A significant amount (more than 0.5 billion tons) of wastewater sludge have accumulated in the territory of Ukraine. Previously, several directions for their utilisation were proposed [2, 3]. The high content of phosphates in sludge, and especially in redundant sludge, allows us to consider such raw material as a promising component of agrochemically effective fertilisers. Unlike nitrogen and other nutrients, fertilisers are the only source for replenishing phosphorus in the soil. The purpose of our work was to create organo-mineral fertiliser (OMF) from sewage sludge, processing plant waste, humic component and study their influence on the ability of plants to use phosphorus of low solubility phosphates of fertilisers and soil.