The flooding and draining cycles of cell 2 are controlled by a solar powered mechanical valve installed within the outlet drain of the cell. Both the depth and time of flooding can be controlled to influence the flow of nitrogen and phosphorus.
Increased flooding time will increase the transformation of liquid nitrogen to gas and cause phosphorus that may be bound to sand or brick particles to become mobile. Decreased flooding will cause nitrogen to remain in its liquid nitrate form and cause phosphorus to stay bound to sand or brick particles.
We are evaluating solar power for installations in areas without electricity and for its potential in other settings. The use of solar energy to move water has a number of advantages, including increased energy storage not typically provided by batteries.