This case study illustrates how a municipal wastewater treatment plant overcame regulatory non-compliance by utilizing a bio-augmentation solution called Biodigestor. The text establishes a clear "before and after" comparison, demonstrating that the introduction of this non-toxic microbial product successfully lowered pollutants like organic matter and suspended solids to safe levels. By integrating these beneficial microorganisms, the facility achieved full legal compliance with Portuguese environmental standards within just two months. Ultimately, the study serves as evidence for the efficacy of biological treatments in stabilising liquid waste processing during periods of heavy organic loading or flow fluctuations.