The ability of self-assembling bioflocculants derived from extremophilic bacteria to treat contaminants in dairy wastewater has received considerable attention. This chapter investigates the synthesis and characterization of these bioflocculants, their properties, and their application in sustainable wastewater treatment. Due to their polyanionic character, extremophilic bacteria, such as Enterococcus faecalis and Lysinibacillus sp., produce exopolysaccharides (EPSs) and have even earned a reputation for their remarkably effective flocculation properties. This characteristic enables various contaminants, such as organic and heavy metal pollutants, to easily bind and aggregate. These bioflocculants’ molecular structure and surface properties have been determined using two advanced characterization techniques: scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR). The findings reveal how useful they are in the elimination of pollutants. Furthermore, some current studies have established that these bioflocculants not only enhance the efficacy of eliminating pollutants but also significantly reduce the production of sludge, thus making it an affordable and environmentally friendly solution to other traditional wastewater treatment methods. The chapter discusses the integration and practical up-scaling applicability of bioflocculants in the target wastewater treatment systems. Literature suggests that these bioflocculants can be produced efficiently and keep their activity in various environmental conditions while making a profit economically. Furthermore, concerns about the sustainable use of bioflocculants and their efficiency on the environmental acceptability of wastewater are highlighted in the discussion. Results aim to illustrate the breakthrough status of bioflocculants in dairy processing wastewater treatment by performing extensive quantitative analysis regarding their biochemical mechanisms and operational parameters.