This is how it works:
The septic sludge is retrieved from the bottom of a collector basin/lagoon/manhole and run through a mechanical screen that filters out all non-digestibles (plastic, cans,…); then it is channeled to a mixer. The mixer has another influx from the organic waste silo of ground down organic matter; both are mixed and introduced into the anaerobic digesters.
Biogas from the digesters is burned to create the process heat necessary for the methanization; the surplus is available for other heating requirements and/or generation of electricity. Biogas contains also large amounts (35%) of CO2 which can be separated out and channelled into an algae farming unit.
Algae farming uses supernatant, CO2 and sunshine to produce a variety of useful algae: feedstock for animal husbandry, raw material for cosmetic industry and lipidineous algae can be used to produce the raw material for bio-diesel. The latter can be used as fuel for internal combustion engines or generation of electricity.
The spent digestate out of the digesters is separated from excess water by a beltpress or similar device; after which it is mixed with Nanobio micro-organisms, filled into containers and stored for fermentation. The fermentation process yields a high quality, nitrogen-rich fertilizer with acceptable levels of heavy metals.
After the supernatant is disinfected from residual pathogenes it can be used for sub-surface irrigation in agricultural crop production and aquaculture (fish farming).
Further purification stages and revitalization by flow forms and re-structuration devices treats the water finally to drinking water standards; upon which it can be used or discharged to fill up the local water tables.