Final answer:
Bacteriological methods are used in secondary recovery to remove dissolved and suspended biological matter in wastewater treatment. This can involve using aerobic bacteria to consume organic components of sewage, identifying microorganisms based on their biochemical reactions, and using bacteria in bioremediation to clean up contaminants.
Step-by-step explanation:
Secondary recovery in bacteriology involves using bacteriological methods to remove dissolved and suspended biological matter in wastewater treatment. One common method is using aerobic bacteria that consume organic components of sewage. These bacteria can be grown on filters or mixed directly into the sewage.
Bacteriological methods also include the use of biochemical reactions to identify microorganisms based on their metabolic tests. Additionally, bacteria are used in bioremediation to clean up contaminants like oil spills or toxic metals by breaking them down into non-toxic forms .