Nutrient removal of effluent from quail farm through cultivation of Wolffia arrhiza

► Wolffia arrhiza can absorb organic substances from wastewater allowing farmers to recycle the water. ► W. arrhiza can fix nitrogen from the atmosphere and can grow very well in the effluent containing a low level of nitrogen. ► A water-recirculatory system is a way to lower the cost of water in quail production. ► W. arrhiza is available in local area and at low price. ► W. arrhiza can be used to make feed ingredient and is possibly even suitable for human consumption.