*3.3. Model for Energy Waste Management*

Taking into account the method of waste storage, four primary sorts of municipal waste generated in populated areas can be distinguished, i.e., mixed waste, waste from selective collection, biowaste and sewage sludge originating from a municipal wastewater treatment plant. The ERWP model is based on the cooperation of four industrial objects responsible for performing various tasks connected with processing of the above defined sorts of waste (Figure 1). The abbreviations used are presented in Table 2.


The first object is the mechanical treatment plant (MTP), to which mixed waste is directed. The MTP technique is based mainly on the screening as well as manual/mechanical separation processes. The second plant is the cogeneration system plant (CSP). In this object, thermal transformation of waste using a highly efficient combustion process will be carried out. The third plant is the gas production plant (GPP) processing biodegradable waste using two types of methane fermentation performed in high (WMF module) and in low water content conditions in the so-called dry fermentation process (DMF module). The fourth plant is the biological stabilisation in air condition (BSAC), i.e., the use of an intensive biological material aeration process under controlled conditions (composting). The key issue qualifying determination of the entire system's energetic potential is the mass balance of waste flowing between particular plants and the balance of energy generated in unit processes provided in the ERWP model.
