| 摘要 |
<p>PURPOSE:To control pH rapidly and accurately, by a method wherein treated water flowing from a reactor while being treated is returned to the reactor in a specific ratio with respect to the quantity of the waste liquid supplied to the reactor to be mixed with a raw liquid to be supplied. CONSTITUTION:Treated water taken out from a reactor 3 is sent into a gas- liquid contact tank 5 through a pit 4, a treated water recirculation pump 9 and treated water recirculation piping 15. Air and inert gas are sent into the gas-liquid contact tank 5 from a blower 10 through an air feed pipe 16 to be sufficiently mixed with treated water, and CO2, H2S or the like contained and dissolved in treated water are volatilized from the discharge pipe 18 of the gas-liquid contact tank 5. The treated water after gas-liquid contact treatment is taken out from an outflow pipe 17 to be returned to the reactor 3 and this cycle is repeated if necessary to recirculate the treated water. By this method, stirring efficiency is enhanced and the required quantity of energy can be reduced.</p> |
