water hyacinth
3.The results showed that there was good purification effect of water hyacinth on piggery waste water. When not affecting growth of water hyacinth, the more water hyacinth planting at unit acreage, the more removal rate of COD and NH + 4 N. Planting 47~140g of water hyacinth in pot 40cm in diameter, the removal rate of COD is 48.9%~58.1%,and NH + 4 N is 81.4%~89.9%.

