| 摘要 |
An effluent, for example, from a distillery which has high biochemical oxygen demand (B.O.D.) created by the presence of oxygen demanding anions, is treated in an ion-exchange resin bed, e.g. an anion exchange bed, to produce treated effluent of lower B.O.D. The bed is regenerated with an acidic or basic regenerant, e.g. sodium or ammonium hydroxide, to obtain spent regenerant. The spent regenerant, after addition of fresh acid or base, is used in successive regenerations to build up the concentration of salts which can be removed in portion as product. <IMAGE> |
