COMPONENTS OF IWTS
The installation of the Biogas Sewage Disposal System comprises the complete installation of the following items:
Digester with appurtenances
DESIGN APPROACH AND CALCULATIONS
The volume of the digester shall be designed to serve a population of persons. Considering the system of water usage for the WC cisterns of either 6litres or more.
Water Usage (W)
Formula for Digester Volume
DV=P x W x RT
Land Area Demand
Even though a specific land area is required for the construction of digesters after constructions, all what will be seen of the digesters which shall protrude above ground level of the reclaimed and regressed entire land area excavated.
A maximum retention period must be incorporated with the planning and designing to destroy the inherent bacteria under airless condition.
Unlike the septic Tank, Anaerobic digesters are self-emptying. Thus the question of dislodging is totally eliminated. The major maintenance shall be possibly renewal of the galvanized gas transporting pipes over a period of about ten years. If not the day to day operation shall be almost maintenance free.
There shall be an almost negligible amount of sludge depositers. This is because organic matter, water ratio is of either 1-6 litres, and this shall be enough to dilute the organics. Should there ever be additional biomass introduction into the digesters through unorthodox means that shall result in sludge build up, high pressure water can be used to disturb the accumulated sludge after which the plant shall continue with its work.
Life Span of the Digesters
It can confidently be said that the constructional principles shall render the digesters very robust, and can guarantee its operation for over 40 years baring major earthquakes. Bricks or approved equal shall be used for its construction. The implementation of this project will indeed exploit the residual energy and nutrient value sewage and bio-municipal waste for use, while providing good sanitation and environmental performance for the facility’s operations. The project will ensure that the facility meets the regulatory standards of the Environmental Protection Agency for waste water discharge quality required under the environmental permit for the household or industries.