Sort Ammonia Causes With a Fishbone Lens

Sort each ammonia-spike clue into the fishbone branch it best fits. Methods Machinery Materials Measurement People Environment Automatic feeder was changed from 6 to 8 feeds per day without updating tray checks Biofilter bypass valve was left partially open after maintenance New high-protein feed batch creates more nitrogen load at the same ration TAN reagent is expired and color card is water damaged New technician sampled from the inlet instead of the tank midpoint Heavy rain diluted alkalinity and slowed nitrification Solids purge interval was skipped during the weekend routine Air blower pressure dropped below the biofilter's operating range

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