This master's thesis, entitled "The Development of the Wastewater Processing Exemplified by the wastewater federation Grazerfeld", focuses on the disposal of effluent sludge and solid waste. Where does wastewater come from? Who are the producers? What harmful substances and at what concentrations can wastewater contain and how does that ultimately affect the disposal and reuse possibilities of products of wastewater purification such as effluent sludge and solid waste materials? The following working hypothesis forms a framework for the answering of these questions in individual sections of this master's thesis: the possibilities for effluent sludge and solid waste processing are limited, moreover in the future there will be more dependence on the agricultural recovery and processing option. The methodology used for this master's thesis includes extensive literature research as well as personal participation in the process combined with photographic documentation and personal contact with experts in the wastewater purification field, including interviews which have been integrated into the paper. On the basis of the results of this work, future disposal alternative such as the mono-burning of effluent sludge some sort of phosphorus recovery will be further encouraged and developed by the Graz Area Wastewater Board with the aims of sustainability and environment protection.