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1. (WO1985001671) A PROCESS FOR CONTINUOUSLY REMOVING AND RECOVERING RESPECTIVELY A GAS DISSOLVED IN A LIQUID, PARTICULARLY AMMONIA FROM AQUEOUS AMMONIA WASTE WATER

Pub. No.:    WO/1985/001671    International Application No.:    PCT/NL1984/000034
Publication Date: Apr 25, 1985 International Filing Date: Oct 15, 1984
IPC: B01D 19/00
C01C 1/10
C02F 1/58
Applicants: DRESE, Jan, Theo
Inventors: DRESE, Jan, Theo
Title: A PROCESS FOR CONTINUOUSLY REMOVING AND RECOVERING RESPECTIVELY A GAS DISSOLVED IN A LIQUID, PARTICULARLY AMMONIA FROM AQUEOUS AMMONIA WASTE WATER
Abstract:
A process is developed for continuously removing and recovering respectively ammonia from aqueous ammonia waste water (1) by stripping the waste water in a column (2), using heat absorption from already stripped waste water and by using a gas flow (5), e.g. an air flow, flowing in counter current with the waste water through the column. The heat transfer is effected by a gas flow which, by direct contact in a packed bed (15), absorbes heat from the effluent liquid whereafter this absorbed heat is again transferred (3) to the influent liquid. Preferably the gas flow consists of a recirculating air flow (13, 16) having a high temperature, said air flow transferring heat in a part of the column which is provided with a packed bed, to the waste water to be stripped, flowing in counter current to the low temperature waste water, whereafter the same air flow, now having a low temperature, recuperates in another part of the column, likewise provided with a packed bed, heat from the stripped liquid, now having a high temperature, also in counter current.