The AmmEL-HC Process
AmmEL-HC (High Concentration) is a patented ammonia removal process consisting of strip and scrub columns linked to an electrochemical reactor. Operation is continuous and works exceptionally well over large temperature ranges. AmmEL-HC is an excellent complimentary system for municipal waste treatment facilities during cool weather conditions when nutrient removal in biological digesters slows down. With high removal rate immediately upon startup, it is able to divert excess loading from existing digesters during acclimation periods or system upsets.
There are three phases: stripping ammonia gas from the wastewater, scrubbing the ammonia back into a closed loop of water, and electrochemically converting the ammonia to free nitrogen gas.
In the first phase, sodium hydroxide (NaOH) is added to the wastewater stream just before being pumped into the stripping column. This raises the water pH to the point where ammonium ions (NH 4 + ) are converted to ammonia gas. Ammonia removal is enhanced by pumping the wastewater stream into the top of the column which is packed with high surface area packing material. Air is pumped into the bottom of the column. The ammonia carried by the air stream is then transferred to liquid in the scrub column.
At the core of AmmEL-HC is a patented electrochemical reactor that converts the ammonia dissolved in the scrubbing liquid to gaseous Nitrogen without producing nitrates or greenhouse gases . Chemically inert and occupying an 80 per cent proportion of our atmosphere, gaseous nitrogen is the ideal end product for safe dispersal into the environment.
Testing of the AmmEL-HC system has demonstrated its capabilities. As shown below, a percentage removal ranging from 93% to 99% was achieved throughout the test.
|
Concentration |
Removal |
Inlet |
500 |
|
Outlet |
<5 |
>99% |
|
|
|
Inlet |
1000 |
|
Outlet |
78 |
93% |
Other advantages of AmmEL-HC include:
- Improves performance of existing biological treatment plants by preventing ammonia toxicity in the activated sludge process
- Less expensive than conventional processes, including biological treatment
- Does not convert ammonia to nitrate and does not produce greenhouse gases
- Small footprint - can reduce overall cost of land for new biological treatment plants
- Can operate intermittently without start-up delays
- Fully automated - low maintenance
- Remotely monitored
We can configure a system according to your needs.
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