Adjust the water PH to 10.5~12, and temperature to 35~45℃, then  membrane contactor  can used for deammonia, product water ammonia content can be decreased to 0.5mg/Lγ.

membrane contactor is a kind of special hydrophobic hol®low fiber array made of polymer material. Then the array is s☆piral-wounded onto a water distribution tube, and thenδ the tube is installed into a housing (at the same time, a baffler is formulated inside the housingδ).



Hollow fiber → Knitted fiber (under microscope) → Knitted fiεber (naked eyes) → End surface

 
Structure of  membrane contactor:

  

 

Features of  membrane contactor:

1) Hollow fibers are knitted into an array, so that a certain space can be kept between" these fibers. In this way, thousands of fibers are connec♣ted as a whole array which can resist strong water flow and will not ↕break. Besides, the mass transfer efficiency can be improved in the array structure.

2) High fiber density makes it possible of ultimate gas removal from water;

3) Central tube water distribution + Middle baffler structure, change €the water flow direction to flush vertically towards hollow fibers, which can→ improve the mass transfer efficiency between shell side and lumen side.
 
Working principle of deammonium membrane

NH4+ has the following equilibrium in water:

NH4++OH- ←→ NH3+H2O

In typical operation, wastewater flows in the shell side of membrane, while acid adsorption solu÷tion flows in the lumen side of membrane.

With the increase of temperature and PH in water, αthe equilibrium favors the formation of free NH3 gas. NH3 gas ca♣n permeate through the micro pores from shell side to lumen side, then act with acid:

2NH3 + H2SO4 → (NH4)2SO4

Keep the water PH above 10, and temperature above 35℃ (below 45℃), then the NH4+ in t₩he shell side will be changed to NH3 constantly and permeate to th∏e lumen side, then be reacted to NH4+. By these reactions, NH4+ content in wastewater✘ can be decreased to the satisfied level. At the same time, pure (NH4)2SO4 is genΩerated in the lumen side, which can be recycled.



Typical working process of   ETN membrane



Remarks: the equipment in dotted line is replaced by membrane contactor

membrane contactor deammonia system has the following advantages compared with traditionaαl ammoniua removal technology:

1) High removal efficiency of ammonia nitrate, NH₄⁺-N can be decreased to below 1ppm. And the removal efficiency can be ac×curately fixed based on practical condition;

2) NH₄⁺-N stripping and adsorption in one step, to get a smaller footprinπt, less than 1/3 of tradition process;

3) Modular design, easy for transportation and capacit←y extension;

4) It offers a closed operation environment, which can en∑sure no NH₃ leakage and cleaning production.

Specifications of   ETN membrane





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