On the production and the purifying capacity of bourgou (echinochloa stagnina) by wastewater stabilzation ponds

Bourgou (Echinochloa stagnina) production under irrigation with wastewater was carried out on two wastewater processing units. Channel 1: (B12) bourgou pond fed by anaerobic wastewater, Channel 2: (B4) of bourgou pond fed by sewage that passed through two hyacinths ponds. The parameters that characterize the organic pollution and nutrients of waste waters and bourgou growth were followed. Weed cutting took place every forty-eight days. The results showed that bourgou growth depends not only on nutrients contributions, therefore the nature of waste water but also plants oxygenation. The bourgou of channel 1 has grown much faster than that channel 2 because wastewater from the channel 1 was richer in nutritive elements (nitrogen-containing organic matter, ortho phosphate ...) than that of channel 2. Wastewater underwent treatment through hyacinth planted filters in both ponds. The yields of fresh and dry bourgou were higher in the (B12) pond than in (B4) pond. Thus they were respectively of 6.11 t / ha and 0.74 t / ha for (B12) against 3.9 t / ha and 0.57 t / ha for (B4) at the first cut on the one part, and the other 18.6 t / ha and 4.03 t / ha for (B12) against 4.13 t / ha and 0.80 t / ha for (B4) at the second cut.