3 replies to this topic

[Yachtsman]

Hi,

 

I'm a junior process engineer and have to find a way to remove ammonium (NH4+) from wastewater at the end of the process (after coagulation, flocculation and passed a active carbon filter). The installation has to fit in a high cube container (max 2.5 m high) with the preference for about 2 m for easier construction.

 

Wastewater characteristics:

Flow: 300m³/day, 12.5 m³/hr

pH: 9-11

NH4+ influent: 30 ppm or mg/L

NH4+ effluent: 2 ppm or mg/L

Temperature: about 17°C

 

From the handbook "Wastewater Engineering, Metcaff & Eddy, 5th edition", p1245, I have tried to set up a design for a stripping tower by the NTU/HTU method. The diameter and height of the tower seems to be right, but the required airflow for the tower is high (4,69 m³/sec - 281m³/min - 16873 m³/h). There are blowers that can produce this amount of air, but they are expensive...

 

=> Are these calculations correct, so the amount of air is really so high?

 

By searching on the internet (and on this forum  ), I saw that ammonium can also be removed by ion exchange by the use of the zeolite "clinoptilolite". It seems to be a optimum way to remove ammonium for high flows in a compact way (just what we need). 

 

=> Is working with the ion exchange a good option for this problem and will it remove the asked amounts of ammonia in an economical way? Are there tables to calculated how much you need for what amount of removal of ammonium?

 

Many thanks in advance!

 

Yachtsman

Attached Files

•  Ammonia stripping.xlsx   12.78KB   18 downloads

[breizh]

Hi ,

Are you talking NH4+ or NH3 ?

I've experience where NH3 was recovered from NH4Cl  solution after a chemical reaction with lime and then distillation .

Now the  link attached may give you other pointer :

 

http://www.cleanwate...ter_A-Prime.pdf

 

Hope this helps

 

Breizh

Edited by breizh, 05 December 2015 - 01:12 AM.

[P.K.Rao]

I read a report some years back on removal of Ammoniacal nitrogen from effluent water. Given below is its reference:

 

Aziz, H.A. and Hussain, S. and Isa, M.H. and Asaari, F.A.H. and Adlan, M.N. (2005) Ammoniacal Nitrogen Removal from Synthetic Wastewater Using Limestone and Granular Activated Carbon in Batch Study. In: International Conference on Natural Resources and Environmental Management (NREM 2005), Institut Kimia Malaysia, Kuching, Sarawak, Malaysia, November, 2005, Kuching, Sarawak, Malaysia.

 

You may try to get the report and try if it is applicable in your case

[Yachtsman]

Thanks for the feedback!

 

Because of the salt regeneration issue for ion-exchange with zeolite, we will go for the stripping tower to remove NH3 from a basic solution with NH4+. Hopefully, we design a optimum tower.