What property of bacteria allows them to be used in sewage treatment plants?

As a result of their vital activity, many bacteria decompose organic matter into separate mineral elements. Depending on the conditions under which the decomposition process takes place, bacteria are distinguished between anaerobic and aerobic. Anaerobic bacteria actively decompose organic matter with a lack of oxygen. This produces a solid precipitate that can be easily removed and also produces methane gas. For aerobic bacteria, a favorable environment is a liquid enriched with oxygen and with a large amount of organic residues.
These methods of wastewater treatment are very effective, as they allow you to separate 98% of all sewage waste.