DEVICE FOR TREATING ORGANIC WASTE WATER AND METHOD FOR TREATING SAME

摘要

The purpose of the present invention is to prevent biofouling of a reverse osmosis membrane in a water treatment device whereby biologically treated water containing ammonia nitrogen is treated using a reverse osmosis membrane unit. In the treatment device and treatment method according to the present invention, a chlorine-based chemical such as sodium hypochlorite is added to biologically treated water containing ammonia nitrogen and the ammonia nitrogen is allowed to react with the chlorine-based chemical at least for 3 minutes in a water tank. Thus, chloramines are formed in the biologically treated water to give an effective chlorine concentration of 2 ppm or higher and the chloramine-containing biologically treated water is supplied to the reverse osmosis membrane unit.