Great initiative! One aspect, ...

Great initiative! One aspect, that is mostly not taken into consideration when explaining the wastewater treatment process, is that what we do in a WWTP is closing the cycle from photosynthesis (water + CO2 + sunlight energy > energy rich organic matter + O2), via human and animal consumption and digestion (including O2 uptake) for energy and growth, producing loaded wastewater in the process, back to water and CO2 in the WWTP by supplying micro organisms with atmospheric oxygen, which these use for the digestion of the organic matter in the wastewater.