Ammonia Evaporation And Condensation In Packed Beds

Hi,

I am struggling to get to grips with ammonia nitrogen (NH3-N) in dirty water, and if this water is evaporated, how much of ammonia will be in the gas phase and then how much of that might recondense into water in the absorber?

Details in attached

I have 2 columns filled with 50 mm plastic Pall Rings, almost 12 m tall.

1st column does the stripping and 2nd column does the absorption/condensation

1st step is to estimate how much ammonia will be evaporated into the air+ water vapour stream in the 1st column, then when this air+vapour is transferred to the 2nd column, where the water vapour will be condensed , how much of that ammonia might re-condense into the water stream.

Then the "same" air (minus water evaporated + with ammonia) is sent back to the evaporator column.

Any hints or ways to tackle this using mass transfer coefficients, Henry’ constant, .. will be appreciated.

Ideally, I would like to have the ammonia in gaseous phase and very little transferred to the condenser water - any thought/s ideas?

Best regards,

Nick

Sorry, with attachment