World Water Works, Inc. has recently upgraded its deammonification (Demon) technology to include a micro-screen, replacing the hydrocyclones previously in place in the system.
This micro-screen can be operated in either continuous or SBR mode and provides a stronger physical barrier which could retain more than 95% of the anammox in the system.
The size of the micro-screen allows the opportunity for the anammox to grow to 2 mm granules. An anammox granule has a higher density than other bacteria within the system, which helps the product to easily settle.
The hydrocyclones were previously used to retain the anammox under gravimetric forces. The heavier material would be retained and sent back into the system while the light portion was wasted. The company claims to have demonstrated loading rates of up to 1.4 kg N/m3 per day while still achieving the same process efficiency.