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I first of all make a point of than

I first of all make a point of than

I first of all make a point of than

(OP)
I first of all make a point of thanking all those which tried hard to answer my request, and by the same occasion to excuse the  imperfections of language, because my knowledge in English language is  limited enough.  
Our station of demineralisation on exchanging resins of ions is made up of two columns with mixed beds. Water to be treated is a desalinated water (from sea water).  These characteristics are as follows:  
PH:8.8
Index permanganate:  < 0.5 mg/l
Iron and manganese: <  0.5 mg/l
Free chlorine content: <  0.2 mg/l
The chlorides (Cl - :  2 mg/l
Silica:  400 µg/l
Conductivity (µs/cm with 20°c):  20
Ammonium Nh 4 +  : 2.5 ppm  
Iron Fe +2  : 50 ppm
Copper Cu +2  : 20 ppm
Cation salinity: : 0.054 mg/l
Anion salinity: : 0.057 mg/l
KnnO 4  : 0
C.O.T " total organic carbon ": : 0
Regeneration is done simultaneously with sulphuric acid and the caustic soda.  
Simultaneous regeneration implies that the rejections with the acid and the base leave at the same point.  This mixture is directed towards a  pit of neutralization.  This pit is not covered.  It's in a direct contact with the air.  I would like to know if the fact that the pit is not covered, does not have an impact on the atmosphere (vapor release), and the impact of this rejection, knowing that the receiving medium is the sea

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