Method of treating waste solution containing chromate ion or cyanide ion

Abstract

Abstract A METHOD OF TREATING A WASTE SOLUTION CONTAINING CHROMATE ION OR CYANIDE ION, WHEREIN A REDOX POTENTIOMETER WITH A PH CORRECTION CIRCUIT IS USED INSTEAD OF SEPARATE REDOX POTENTIOMETER AND PH METER COMMONLY USED IN THE CONVENTIONAL TREATING METHOD OF WASTE SOLUTION, SAID REDOX POTENTIOMETER WITH A PH CORRECTION CIRCUIT HAS A REDOX POTENTIAL DETECTING PART AND A PH DETECTING PART FOR THE DETECTION OF THE REDOX POTENTIAL AND THE PH ELECTROMOTIVE FORCE OF THE WASTE SOLUTION BEING TREATED AND THE OUTPUT VOLTAGES ARE SUPERPOSED WITHIN SAID PH CORRECTION CIRCUIT SO THAT THE VIRIATIONS OF REDOX POTENTIAL CAUSED BY THE VIRATIONS OF PH VALUE OF THE WASTE SOLUTION IS COMPENSATED AND A CORRECTED OUTPUT VOLTAGE WHICH INDICATES THE REDOX POTENTIAL CORRESPONDING TO A PRE-SET PH VALUE OF THE WASTE SOLUTION IS GENERATED, THE REDOX POTENTIAL AND THE PH ELECTROMOTIVE FORCE OF THE WASTE SOLUTION BEING TREATED IN THE TREATMENT TANK ARE DETECTED RESPECTIVEPLY, BY SAID RDOX POTENTIAL DETECTING PART AND PH DETECTING PART OF SAID REDOX POTENIOMETER WITH A PH CORRECTION CIRCUIT, AND THE AMOUNT OF TREATING CHEMICALS BEING FED INTO SAID TREATMENT TANK IS ADJUSTED, BY A FLOW REGULATOR WHICH IS CONTROLLED IN RESPONSE TO THE CORRECTED OUTPUT VOLTAGE DELIVERED FROM SAID PH CORRECTION CIRCUIT OF THE REDOX POTENTIOMETER, TO A QUANTITY AS THE CHEMICAL REACTION IS CARRIED OUT AT THE EQUIVALENCE POINT. D R A W I N G

Inventors

• 👤 T Nakamura

Bibliographic Details