Bacteria are instrumental in the breakdown of organic (and some inorganic) waste. Septic tanks and municipal water treatment stations are the best examples of where bacteria (and associated enzymatic activity) break down animal and food waste and more recently commercially available bacteria-based products became useful for aiding in commercial food waste processing (commercial kitchen/restaurant grease converters) and also for water treatment (industrial and rural sediment settling and water treatment ponds).
Initially in the US the use of similar / safe bacteria showed some progress in drain treatment specific for urinal drainage issues. Various strains were used to destroy the bacteria feeding off uric acid. This is achieved by the introduced bacteria beating the unsavoury bacteria to the food source.
This theory and progressive trials also showed this approach to be useful for other applications, where again the “good” bacteria consumed the food source from which “undesirable (and smelly) bacteria” fed.
Success has also been shown in eliminating odours, though this is more to do with fragrance, and the ability to rid the area of bacteria, rather than acting directly on the odour molecules.