Practitioner's Tool / Vermicomposting digester
Vermicomposting digesters offer primary treatment of wet mixed blackwater.
The effluent flushes from the toilet into the chamber and adds to a "heap" sitting on filtration media. The liquid drains away through the media and is discharged to land. The system is aerobic because the heap composts in an aerobic environment (i.e. ventilated) and the worms introduce air into the heap. They are very effective at reducing bulk and with sufficient worms present the heap grows only very slowly.
Vermicomposting digesters are used for municipal sewerage treatment and for domestic on-site sewage treatment. These systems incorporate flush toilets and filtered effluent disposal to land.