Sorry to rain on this parade ...

Sorry to rain on this parade of very nice and caring professionals. Their knowledge of ancient waste treatment is admirable.  Currently in the industry one by one waste treatment facilities are phasing out chlorine in favor of microbial degradation.  This modern microbiological process has 40 plus years of ZERO pathogens. In addition the O2 content of the clean potable water is much higher. Not more O2, just more available.   Most old and really outdated facilities are not cost effective to change over.  Usually the new facilities are built at a greatly reduced price and the discharge can be directed to any of 3 main ways. 1. Put back into the drinking water system 2. use this water for agriculture. (free to farmers, they pick up). 3. Never need to dump in any river, lake or ocean ever again. But if you decide on this option no more killing the microbes in nature that provide life to all things.  The microbial species is Archaea. The process is called Bioremediation.

To learn more and ask all the questions you want go to Archaea Bioremediation Group.