System for controlling the dosage of external carbon source using continuous measurement device of nitrogen ion

PURPOSE: An injection controlling system for an external carbon source using a continuous measurement device for a nitrogen ion is provided to stably remove nitrogen by measuring a concentration on a real time basis, and automatically control an injection amount of the external carbon source. CONSTITUTION: An injection controlling system for an external carbon source is applied to a sewage high disposal process consisting of anoxic chambers(3,5), aeration tanks(4,6) and a settling tank(7) to inject the external carbon source to the anoxic chamber using a continuous measurement device for a nitrogen ion. The injection controlling system for an external carbon source comprises the following: measuring unit(A) to consecutively measure the concentration of a nitrogen ion among contaminated water; a potentiometer unit(B) amplifying the minute electric potential generated from the measuring unit; and a data processing unit(C) storing a digital signal generated from the potentiometer unit. The sewage high disposal process is a bardenpho process.