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    • 17. 发明公开
    • PROCESS AND APPARATUS FOR TREATING AMMONIA-CONTAINING WASTE WATER
    • VERFAHREN UND VORRICHTUNG ZUR BEHANDLUNG VON AMMONIAKHALTIGEM ABWASSER
    • EP1314698A4
    • 2004-07-07
    • EP01917738
    • 2001-03-30
    • BABCOCK HITACHI KK
    • KIKKAWA HIROFUMIKATO YASUYOSHITAKAMOTO SHIGEHITONAKAMOTO TAKANORI
    • B01D3/38B01J21/06B01J23/648B01J23/652C01C1/10C02F1/02C02F1/20B01D53/86C02F1/58
    • B01J23/652B01D3/38B01J21/063B01J23/6482B01J23/6527C01C1/10C02F1/02C02F1/20C02F2101/16C02F2209/14C02F2209/40Y02P20/52Y02P20/584
    • A process for treating an ammonia-containing wastewater, which comprises the steps of contacting an ammonia-containing wastewater A with steam C (carrier gas) in a stripping column (7) to transfer NH3 to a gas phase from the ammonia-containing wastewater A; heating the resultant gas containing NH3 in a preheater (11)and then contacting the gas with a catalyst layer (13) to decompose NH3 into nitrogen and water; measuring the NOx (or N2O) content of the gas generated in the above decomposition step; and adjusting, based on the measured values of the NOx (or N2O) content, one or more of (a) the feed rate of the ammonia-containing wastewater, (b) the NH3 content of the ammonia-containing wastewater and (c) the flow rate of the gas containing NH3 to be contacted with the catalyst layer [when the N2O content is measured, one or more of the flow rate of the carrier gas, the flow rate of an added gas such as air, and the flow rate of the part of the gas generated in the above decomposition step to be recycled to the catalyst layer]. The process is advantageous in that an extremely small amount of hazardous substances such as NOx is discharged even at the start of an apparatus for the process or when the NH3 content of a gas is considerably changed.
    • 公开了用于处理含氨废水的方法和装置,其中在开始操作装置时形成的有害物质如NOx形成的量甚至在气体中的氨(NH 3)浓度为 经受N​​H3分解步骤(如下所述)变化极小; 在该方法中,含NH 3的流出物A和蒸气(载气)C在汽提塔7中接触以将NH 3从流出物转移到气相,含有在塔中汽提的NH 3的气体用预热器1 然后与催化剂13接触以将NH 3分解成氮和水,确定包含在气体中的NO x(或N 2 O)在NH 3分解步骤中的浓度,并且参数(a)中的一个或多个 供应到汽提步骤的流出物,(b)流出物中所含的NH 3的浓度,和(c)与催化剂接触的含NH 3的气体的流量(当确定N 2 O浓度时,一个或多个 (e')载气的流量,(f')要添加到含NH 3气体中的气体的量(f'),(g')一部分气体的量 NH 3分解步骤并循环)根据NOx(或N 2 O)的浓度来调节 )。