铵离子交换工艺处理炼油废水中的氨氮

The Removal of Ammonia from Refinery Wastewater by Means of a Ion Exchange Process

对于低浓度含氨氮废水,铵离子交换工艺具有高效、低耗的优点。在实验室利用固定床离子交换装置处理氨氮废水,在20L/h条件下,铵交换量达到最大,为6.1mg/g。分别选用氢氧化钠和氯化钠的混合液以及碳酸钠溶液作为再生液,交换剂可以得到再生。在40L/h条件下,以碳酸钠溶液作为再生液,连续处理石化含氨废水。在进水氨氮浓度小于50mg/L条件下,出水氨氮小于1mg/L;在进水氨氮浓度60～80mg/L条件下,出水氨氮小于2mg/L。再生液用量约为床层体积的4倍。

Several kinds of technologies toward removing nitrogen from wastewater were summrized in this paper. As far as low concentration wastewater was concerned, ion exchange process seemed to be a good one with relatively high efficiency and low energy in need.A fix-bed ion exchange plant was employed to treat ammonia contaning wastewater in labortary. Among the three conditions, the condition of 20L/h reached their maximum value of 6. 1 mg/L in term of ammonia exchange capacity was considered. In order to regenerate the adsorbent, the mixture solution of sodium hydroxide and sodium chloride and pure solution of sodium carbonate were served. According to the experiment results, both of them were availible in removing the ammonium ions had been adsorbed by the obsorbent before. A continuous experiment was carried on after the flow rate and the kind of regenerent were choosed. On the condition of ammonia concentration of influent less than 50mg/L, the ammonia concentration of effluent was less than 1 mg/L; when influent concentration dropped in the scope of 60~80mg/L, the effluent concentration rised slightly to the level of less than 2 mg/L. The amount of regenerent was about 4 times as many as the volumes of the obsorbent.