pH NEUTRALIZATION TREATMENT APPARATUS FOR ALKALINE WASTE LIQUID

摘要

PROBLEM TO BE SOLVED: To provide a pH neutralization treatment apparatus for an alkaline waste liquid performing effective neutralization treatment by compact constitution, capable of being arranged at a low cost and reduced in running cost. SOLUTION: A carbon dioxide supply pipe 4 is allowed to meet with a water discharge pipe 3 extended from an underwater pump 1 in a reaction tank 2 and formed into a nozzle at its leading end part and a raw water suction pipe 7 upwardly guided from a raw water tank 8 of an alkaline waste liquid is allowed to communicate with the negative pressure part of the outer periphery of the nozzle to constitute an ejector 9 and the upper part in the reaction tank 2 is demarcated into a hermetically closed gas reservoir chamber 13 and a venting chamber 14 opened to the atmosphere by a partition plate 10 guided from the upper surface part in the reaction tank 2 to the region under the opening position of an outflow port 11, and the outflow port 11 led out to the outside from the venting chamber 14 is opened and the led-out leading end part of a pipe 17 branched from the raw water suction pipe 7 to be guided therefrom is opened to the gas reservoir part 13 above the surface of the liquid to constitute a carbon dioxide re-suction passage.