All the biochemical ...

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All the biochemical components of the urine plus the methanation released by the decomposition of organic matter generate gases which rise from the bottom of the tanks. Just stir the effluent to kill this process
There is no anaerobic process in a fully Aerobic tank containing H2o water (one hydrogen molecule for TWO MOLECULES
OXYGEN)
It is impossible that a state without oxygen can be created in a completely Aerobic environment which is more in motion.