Waste water purificn. with active charcoal columns - the first being aerated, giving reduced charcoal losses

摘要

Purificn. of waste water contaminated with organic impurities comprises treatment with 2 or more sequential columns of active charcoal, the first (at least) of which is supplied with air or an oxygen-contg. gas, esp. pure oxygen. Pref. the gas- treated columns are operated at up to 100, esp. 20-80, deg. C and the gas treatment is esp. carried out in a fluidised bed of charcoal. Treatment with the gas reduced the amt. of charcoal which needs to be regenerated and thus lowers charcoal losses. The degree of purifcn. reached is as good as that acheived with other methods and often better, so that additional purificn. stages are not required.