Hi Charles. It will depend ...

Hi Charles.

It will depend on the effluent main characteristics. I believe that a simple treatment as screening, flotation, aerobic biological treatment, followed by a more intensive coagulation/flotation, filtration and ozone/UV treatment (and only as backup a reverse-osmosis) process, with a storage tank with chlorination is more than enough to ensure the water cycle.

The sludge for the different treatments could be treated by anaerobic treatment (even the coagulation/flotation that should be a a smaller amount when compared with the rest), producing bio-gas that could be applied to ensure the anaerobic treatment (or more energy, but I have my doubts...).

The first process, to treat water is proved, however as higher power consumption due ozone and UV treatment besides the aeration. The second (sludge treatment) except the referred inorganic/organic sludge is also been used.

Best regards, Nuno AS