During the Ecorient 2013, the tOD team had the chance to get introduced to the Natural Wastewater Treatment Plant developed by Rached Sarkis in Remhala using the local canes found in Lebanon (Arundo donax).
The natural system relies on the characteristics of the roots of canes. They are dense and have a capacity to fix bacteria; the bacteria removes the pollutants from the water.
The system relies only on gravitational force by transporting the water from one stage to the other. The drawing explains the process of the treatment:
1.Sedimentation tank to remove all solid particles and have a homogeneous affluent.
2.The affluent goes through the first and then second purification station. Integrating two stations improves the level of treatment and regulates the velocity of the flow. Moreover the capacity of the system increases, because as soon as the first station is saturated, the affluent moves to the second station.
3.The systems results with fresh water flowing out, ready either to be reused, or flushed without any harm in nature.
Some of the advantages of this system are:
•Clean water without bad odor
•No harm in releasing the water back in nature and into the ground
•Low maintenance cost
•No electricity use (since the systems relies on the gravitational cost)
•Removal of specific particles such as carbon, azote, nitrogen and potassium
•Adaptation to seasonal changes