Aerated package plant using mechanically pumped oxygen to sustain aerobic (rather than septic tank's anaerobic) digestion, cleaner effluent, a smaller footprint, and viable on sites with poor drainage or a high water table where a conventional drain field would fail. Trade-off: needs continuous power for the aeration blower and more frequent, more specialist servicing than a septic tank.
Note: Cost, carbon and footprint are rated against the other options for this same need, not in absolute terms.
No sizing or quantities: how much a technique yields, and how much a household needs, both depend on the build and the people, so the catalogue compares options rather than dimensioning them. It carries no bill of materials and no build sequence, and it is written for an oceanic, clay-soil climate (Normandy, France). Regulatory notes are indicative and need confirming locally.