ON-STREAM MONITORING APPARATUS FOR CONCENTRATION OF TREATMENT AGENT CONTAINING ANIONIC POLYMER ELECTROLYTE IN WATER SYSTEM AND CONTROL METHOD FOR INJECTION AMOUNT OF TREATMENT AGENT

摘要

PROBLEM TO BE SOLVED: To obtain an on-stream monitoring apparatus by which the concentration of a treatment agent is monitored with high accuracy in an on-stream manner by a method wherein a reagent is supplied to sample water inside a cololimetric cell at every definite time, the intensity of transmitted light or scattered light in the sample water is converted into an electric signal and the concentration of the treatment agent in the sample water is measured. ;SOLUTION: Sample water from a conduit 1 is made to flow into a colorimeter block 4, its flow is closed after a definite time, and the fresh sample water is stored in a colorimetric cell 5. Light from a light source 6 is irradiated so as to be detected by a photocell 7, the intensity of blank transmitted light in the sample water is measured, and a zero point due to the turbidity of the sample water is corrected. Thick-wall tubes 9 are drawn, and reagents which contain a quanternary ammonium salt and a chelating agent are added from a reagent bottle 10 and a reagent bottle 11. A mixed solution is stirred by a stirrer 13. After a definite time, the absorbance of the mixed solution which is compared with the zero point is measured so as to be fetched as an electric signal, and the concentration of a treatment reagent which contains as aninic polymer electrolyte is known. Fresh sample water is introduced again from the lower part of the colorimer blank 4, the same operation is repeated after that, and a measured value is obtained at every definite time.;COPYRIGHT: (C)1998,JPO