METHOD FOR REUSING WASTE LIQUID FROM WHICH TETRAALKYLAMMONIUM IONS HAVE BEEN REMOVED

摘要

A treated waste liquid obtained from a tetraalkylammonium-ion-containing waste liquid by adsorbing and thereby recovering the tetraalkylammonium ions has been discharged, without being reused, after having undergone an adequate treatment. The treated waste liquid is reused as industrial water to contribute to a considerable reduction in disposal cost and to a reduction in production cost. The treated waste liquid from which tetraalkylammonium ions have been recovered is reused, for example, as industrial water in the step of recovering a tetraalkylammonium hydroxide from a tetraalkylammonium-ion-containing recovered waste liquid and purifying the hydroxide.