The nitration reaction of high chloride (~10,000 ppm) activated sludge system

The nitration reaction of high chloride (~10,000 ppm) activated sludge system

Dear all,

The nitration reaction of activated sludge system H (chloride~10,000 ppm) is not stable (data as attach files), we have to pump the L system activated sludge to promote the nitration reaction ability once in a while. we want to know the difference of system H and L, and to review the data of NH3-N reduction rate,

a.The ammonia oxidation bacteria (AOB) should be in the activated sludge system H.
b.The NO2-N do not react to NO3-N completely in the system H, while the system L is little NO2-N remain  .
c.Some impurities, maybe the chloride, sulfide or others ( we do not know) to injure or inhibit the microorganism NOB or AOB of system H.

The questions list below and ask for dear all:
1.Anyone have the similar experience ?
2.The activated sludge of the H system come from L system, What is the impurities could effect the microorganism NOB or AOB, and make the different for nitration reaction rate?
3.Any suggests for us to improve?