METHOD AND DEVICE FOR DETECTING NITRIFICATION-BLOCKING SUBSTANCE IN SEWAGE AND DISCHARGED WATER

摘要

PROBLEM TO BE SOLVED: To detect each condition of oxidation process of ammonium oxidizing bacteria and nitrite oxidizing bacteria by measuring the amount of consumed oxygen or the amount of generated or consumed nitrite nitrogen. ;SOLUTION: Solenoid valves 18 and 21 are switched for allowing an ammonium standard liquid 8 and a nitrite standard solution 12 to flow, and the difference in the current value of each dissolved oxygen electrode before and after columns 1 and 2 is stored in a storage part as a normal value of the columns (100% output). Then, solenoid valves 19 and 20 are switched, inspection water 10 in which turbid substance is eliminated with a hollow fiber membrane or the like is allowed to flow. At this time, the difference of the current values of the dissolved oxygen electrode before and after the column 1 in which the ammonium oxidizing bacteria are immobilized, and the column 2 in which the nitrite oxidizing bacteria are immobilized is measured continuously. The measurement value is compared with a normal value, and when it is judged that a harmful substance has flowed in when the amount of oxygen consumption of either column or both columns have decreased, an alarm is sent off.;COPYRIGHT: (C)2000,JPO