MONITORING METHOD OF NITRATION REACTION AND DENITRIFICATION REACTION STATE IN CIRCULATING NITRATION/ DENITRIFICATION METHOD

摘要

PURPOSE: To monitor the state of nitration and denitrification reactions. CONSTITUTION: A tank 13 is provided between denitrification tanks 1a, 1b and nitration tanks 2a to 2e for the combined use. A flow meter 15 is provided on the denitrification tank 1a. An Rr meter 16 is installed on the nitration tank 2a. The Nit-Rr value 17 obtained by calculation based on the inflow volume of untreated water measured by the flow meter 15 and a value measured by the Rr meter 16, and the DO value and the water quality analytical value measured by the DO meter 18 installed on the nitration tank 2a are input in a nitration reaction control system 19. A DO control 20 and an SRT control 21 are performed based on a value which is output from the control system 19. In a circulation volume control part 22, a value measured by the DO meter 23, a value measured by the flow meter 15, a value measured by the DO meter 24 on the dissolved oxygen of the nitration tank 2e, and a value measured by a flow meter 25 on the circulation flow of a nitration liquid in the tank 2e are input. A circulating volume control part 22 controls each measurement value to control a pump 6 for circulating the nitration liquid.