BIOROCK multi-units: Delta Okavango wetlands, Botswana
Location
Delta Okavango wetlands, Botswana.
Project
Installation of a sewage treatment system in the middle of the swamps. A unique project because of local constraints: The accommodations, restaurant and spa are built on islands which are completely inundated during the rainy season.
Capacity
90 PE
Client
SPA and Hotel / Restaurant
Installer
BIOBOX South Africa
Technical description
- Several pump stations receiving power from a solar plant and protruding above the water level during the flood season. These pump stations receive effluent from the guest accommodations, staff, accommodations, kitchen, spa and workshop.
- The primary tanks and Biorock units are installed above ground on a timber platform roughly central to the various pump stations.
- 3 off 10,000lt primary tanks are connected in series, receiving the macerated effluent from the pump stations. Each outlet on the primary tank to the next has a brush filter to retain inorganic solids.
- The outlet from the last primary tank flows into a baffle which feeds the 6 off Biorock-15 units.
- The outlets from the 6 off Biorock-15 units flow into a tank which has a low-wattage pump to recirculate a portion of the effluent to the primary tanks to aid nitrification.
- The overflow from this recirculation tank flows into a discharge tank where a low wattage pump reticulates the treated effluent into a sub-surface drain. This is necessary to prevent treated effluent from being disposed directly into surface waters during the flood season.
Project images
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