Good morning

I was wondering if anyone has any thoughts on inline continious phosph or ammonia monitoring specifically:

Small paper mill WWTP/Activated sludge/50% to a covered pure oxygen basin followed by a secondary clarifier. 50% to a sequential batch reactor or ICEAS system. bod loading varies significantly over any given day or hour. effluent tss also and often reaches into the lower hundreds ppm. nature of waste stream requires the addition of both ammonia and phosphrous for treatment in roughly the 100/5/1-bod/ammon/phosph ratio. feed rates are currently adjusted according to lab testing several times per day. obviousely not ideal but I believe if we could find a cost effective and reliable system for monitoring either parameter with porpotional 4-20 outputs we could significantly stabilize nutrients to more closely follow actual demand in real time which would improve bio-mass health/reduce under/over feeding and the problems associated with same/ and better support a system that does not have 24/7 coverage. I also understand that real world performance and maintinance requirements rarely meet manufacturer claims but I would like as dependable/maintinance/calibration/cleaning etc free as possible.

Any and all thoughts would be welcome and thank you in advance.