A biodigester septic system can be an economical option for a residential building or estate in Nigeria, especially when you want to reduce long-term sewage evacuation costs. Depends on the number of occupants, number of toilets, soil conditions, and the cost of construction and maintenance.
Economic value of a biodigester
Lower recurring costs: Can reduce the frequency of desludging when properly designed and maintained.
Space saving: May require less space than some conventional septic-tank and soakaway arrangements, depending on the design and soil.
Long-term investment: A properly constructed system can provide years of service.
Important limitation: A biodigester does not eliminate sludge or maintenance, and its effluent still needs safe disposal or suitable treatment.