A novel denitrification system has been constructed for the removal of nitrate from recirculating aquaculture system (RAS). The system does not employ active sludge or commercial bacteria media for the denitrification and the nitrate removal efficiency is more than 90%. The treated pond water can be directly sent back to the aquaculture system with minimal wastewater discharge. The technology provider is seeking industry partners to further development and commercialization of the technology.
A low-cost denitrification technology for removal of the nitrate for RAS has been developed. The technology has been tested at a fish farm in 2018 and the nitrate removal efficiency is ≥90%. The denitrification system is simple to operate, scalable and easy to be incorporated into existing aquaculture systems.
One major problem of the RAS is the generation of significant amount of nitrogenous wastes such as ammonia, nitrite and nitrate. Currently, water exchange is a common method used to control nitrate levels in the RAS. However, this creates detrimental effects on the environment upon discharge of nitrogen in any forms and increased water usage.
The newly developed denitrification technology has enhanced nitrate removal efficiency with zero-discharge of wastewater. It is compact and scalable design, has secured culturing environment with improved stability and reliability.
It is environmental -friendly as nitrogen in any form is not discharged to the environment and there is zero-discharge of waste water . Can save cost on water as it minimized make-up water volume. It is scalable and can be easily incorporated into existing aquaculture systems.