## 1 Introduction  
This paper pertains to municipal waste that may have a negative impact on the natural environment and human health [1; 2; 3]. Waste management is a global problem originating from economic development [4; 5; 6; 7]. Globalisation processes have contributed, through the systematic increase in the interlinkage between various markets and in numerous aspects of economic and social life, to the establishment of a new institutional order, new institutions and legal and economic solutions [8; 9]. Such processes also promote increases in outlays on investment projects [10; 11], boosting the level of innovation and competitiveness of economies [12; 13; 14; 15; 16]. The fact that in the last thirty years an economic convergence has occurred for the majority of countries is indicated in the literature [17; 18]. The economic convergence processes contributed to permanent changes in consumers' attitudes and awareness, particularly in terms of sustainable consumption when considering concerns about energy consumption and the natural environment [19; 20; 21; 22; 23]. Energetic transformation embraces the majority of economies, including agriculture, in which use of biocomponents produced from organic waste plays a significant role [24; 25]. This means that waste management is equally important for big metropolitan areas and small rural communities [26; 27]. An observed trend of the use of waste as a source of valuable raw materialsrequires development of a functioning waste management model, taking into consideration the possibilities and needs of a given region [28].  
In the article, practical and theoretical aspects of the municipal waste elimination for the city of Koszalin based on an effective functioning waste management system will be considered. The main objective of this paper is the presentation of the ERWP model to be used as a complementary waste management system. The effectiveness of a system based on the ERWP model has been discussed in relation to Koszalin city (Poland).  
It should be underlined that the volume of waste generated worldwide increases systematically, yet a significant part of it is not covered by the system, thus causing quantifiable losses in the economy and natural environment [29; 30]. In 2018 in the European Union, 2538 million of municipal waste was generated, and 55% was recycled [31]. The remainder was put in landfills, causing their degradation to a variable degree [32]. The absence of proper industrial infrastructure for waste processing, mainly in the eastern EU countries, is still the main reason why 40 \(\div\) 45% of waste does not go to local waste treatment systems, resulting in wasting of valuable sources of recyclable and energetic materials [33; 34]. This results in an increase in costs of economic system functioning that is different depending on the solutions adopted [35]. In Poland, almost 42% of generated municipal waste is directly put into landfills [36].  
The ERWP model takes into account a number of conditions, among which the most important ones are: waste type, physicochemical properties, morphological composition and volume. Irrespective of the values of the above parameters, such systems are always based on the application of well-known unit processes, such as: screening, separation, biological treatment, dehydration, thermal transformation and storage. The proper compilation of processes that make up a complementary system depends on the adopted objective that is contingent upon financial and technical possibilities. Such an objective can be, for example, the recovery of valuable waste components within the material or organic or energetic recycling framework [37]. Ultimately, the objective can also be rendering such waste harmless through its storage in controlled conditions. However, taking into account waste composition and its physicochemical properties, this method is economically ineffective and, importantly, has a negative impact on the natural environment [38; 39].