## 1 Introduction  
Throughout the history of mankind, quality of life has continued to develop dramatically, leading to an enormous growth in the amount and quality of waste being disposed of in the absence of appropriate management measures, which potentially threatens human life [1, 2]. Composing is widely used as an effective tool for disposing of waste rich in organic matter, in order to manage the tremendous amount of waste [1]. This process involves the catabolism and anabolism of micro-organisms to biodgrade macromolecular organic matter [3]. It is a process inspired by the functioning of the natural ecosystem, where organic matter is transformed from waste into fertilizer for growing plants, thereby minimizing the requirement for chemical fertilizers [4]. Composing can also contribute to reducing environmental pollution by limiting air and groundwater contamination associated with landfill disposal and incineration. However, the nature of the waste used and its degree of biodegradability may significantly affect the quality and length of the composting process [3]. In this regard, several strategies to improve the composting process have been reported, notably the optimization of operational parameters such as pH, temperature, C/N ratio, etc. [5]; nevertheless, these strategies do not necessarily allow the expected performance of the composting system to be achieved, and it is unlikely that they will succeed in rapidly activating the process [4]. For this reason, many authors have opted for microbial inoculation technology to improve the composting process [4; 6; 7; 8; 9; 10; 11]. Microbial inoculants enhance enzyme activity in compost, contribute to the degradation of tough organic matter and produce more precursors for the polymerization of humic substances, thereby shortening the composting time and improving its quality [12; 13]. Recently, the field of microbial inoculants has received considerable focus, and there has been a great amount of research into composting processes, involving the incorporation of specific microbial strains and/or a microbial consortium [13; 14]. In this respect, bioaugmentation involving microbial strains is an alternative strategy, whereby micro-organisms, specifically bacteria, with their enzymatic machinery, could effectively promote the degradation of recalcitrant molecules and boost humic substances throughout the composting process [4]. A wide range of exogenous microbial genera was studied, such as _Thermobifida, Phanerochaeta, Compostihcillus, Micrococcus_, etc., as well as the microbial consortium, widely recognized for its capability to break down lignocellulosic feedstocks [1; 4; 7; 8], but rarely are studies devoted to the application of endogenous microbial genera within bioaugmentation. Bioaugmentation using endogenous micro-organisms could be more effective at degrading tough organic matter, as these micro-organisms are already perfectly adapted to the waste used, regardless of its composition, and could even withstand higher levels of toxicity, thereby attracting a great deal of interest. Ultimately, in-depth knowledge of how to use endogenous micro-organisms through the entire composting process is crucial not only to improve the treatment itself, but also to optimize it. In light of the above, this research is part of a series of studies involving on the isolation of strains which degrade recalcitrant compounds, which nowadays represent a crucial challenge affecting composting performance using the bioaugmentation approach. For this reason, the effectiveness of three new endogenous bacterial species (_Bacillus_ sp., _Paenibacillus_ sp., and _Enterobacter aerogenes_) was evaluated in order to study their ability to improve the quality and duration of textile waste composting using bioaugmentation.