The rich-nitrogen and low-nitrogen indicators fail to meet the requirements! ! ! How to control it
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The rich-nitrogen and low-nitrogen indicators fail to meet the requirements! ! ! The actual value for rich nitrate is low, while the actual value for lean nitrate is high! How to control it?
The data you provided is insufficient; what are the process parameters? Such as pH value, free chlorine, pressure control, membrane service life, etc. The situation you mentioned could be caused by problems with PH control, low pressure, contaminated membranes, aging, etc.
It is recommended to take samples from each membrane shell to analyze the concentration of the permeate fluid, in order to determine whether the membrane has aged. If it has aged, the membrane must be replaced; if it has not aged, the problem may lie with the sealing ring
It might be that the amount of sodium sulfite added was too small, and the free chlorine corroded the membrane!