Autotrophic Nitrogen Removal (ANR)

CNP Water’s ANR Technology with Anammox Bacterial for Nitrogen Removal

Autotrophic Nitrogen Removal (ANR) Technology developed by CNP Water includes two bio-processes:
1) Partial Nitrification: convert half of the ammonium-N into nitrite-N
4NH4+ + 3O2 → 2NH4+ + 2NO2– + 4H+ + 2H2O
2) Anoxic Ammonium Oxidation by anammox bacterial: eliminate ammonium-N and nitrite-N into nitrogen gas N2
NH4+ + NO2– → N2 + 2 H2O

Autotrophic Nitrogen Removal Technology from CNP Water: Partial Nitrification + annoxic ammoinum oxidation
CNP Water’s Autotrophic Nitrogen Removal Technology: Partial Nitrification + ANR with red sludge anammox bacterial

Anammox bacterial is a novel discovery for cost-effectively removing nitrogen from wastewater. In last seven years, extensive R &D work has been carried out by CNP Water’s technical staff from lab-studies, pilot-scale studies, and on-site full-scale trail plant operation. The RED colored Anammox sludge was initially cultivated from 3 out of 9 lab-reactors, seeding with conventional activated sludge. In the pilot-scale studies, the operation of partial nitrification and anammox process performed for 2.5 years. The ANR bioprocess with anammox microorganism has been showing stable performance by operating at temperature from 22C to 35C degree.

Currently, we are working on a full-scale project to use partial nitrification and anammox process to treat landfill leachate and reject water from sludge dewatering of an anaerobic digester.

CNP Water's full scale ANR Technology with anammox bacterial in a 180 m3 reactor in Ireland treating landfill leachate
CNP Water’s first full scale 180 m3 ANR Plant with anammox bacterial treating landfill leachate in Ireland (April 2015)
Red Sludge Anammox Bacterial Granules from Landfill Leachate Treatment Pilot-Scale Reactor by CNP Water (February 2014)
Red Sludge Anammox Bacterial Granules from Landfill Leachate Treatment Pilot-Scale Reactor by CNP Water (February 2014)
Pilot-Scale Reactor using Anammox Bacterial for Nitrogen Removal from Food Processing Wastewater in Ireland (September 2009)
Pilot-Scale Reactor (2.0 m3) developing Anammox Sludge for Nitrogen Removal from Food Processing Wastewater in Ireland (September 2010)
Anammox Sludge initially enriched from Lab-Scale Reactors in Ireland (September 2009)
Anammox Sludge initially enriched from Lab-Scale Reactors in Ireland (September 2009)