Examples of aerobic conditions for microbial biodegradation include landfills and sediments. Strategies to enhance degradation include ozone treatment and biodegradation. This entails low degrees of bioaccumulation and rapid, clean biodegradation in existing wastewater treatment facilities. Under anaerobic conditions, however, discoloration may be observed as a consequence of biodegradation. In general, they do not persist due to rapid biodegradation, photodegradation, and anaerobic degradation. This factor was attributed to adsorption rather than biodegradation. Lignin is neutral to CO release during the biodegradation process. Its insecticidal activity has relatively low mammalian toxicity and an unusually fast biodegradation. Aerobic biodegradation dominates, i.e. the primary electron acceptor is O. One can differentiate abiotic from biotic substance (biodegradation). Some companies produce biodegradable additives, to enhance biodegradation. They are likely involved in detoxification or biodegradation of many other environmental pollutants. The biodegradation of biomass offers some guidances. The first involves aerobic biodegradation, where oxygen is present and important. In practice, almost all chemical compounds and materials are subject to biodegradation processes.