镍钴锰在氨氮废水中的存在形态及去除机制

Existing State and Removal Mechanisms of Nickel,Cobalt and Manganese in Ammonia-nitrogen Wastewater

研究了废水中镍、钴、锰的存在形态及去除机制。结果表明:镍-氨、钴-氨配合物可在碱性氨氮废水中稳定存在,锰-氨配合物则会迅速形成Mn(OH)_2沉淀;氨氮浓度远高于镍或钴的浓度,碱性废水中,由于镍、钴水合离子比例较小,不会形成Ni(OH)_2或Co(OH)_3沉淀;强碱性条件下加热可使废水中的镍-氨或钴-氨配合物分解,并可实现出水氨氮、镍、钴和锰浓度达标。

The existing state, concentration and removal mechanisms of nickel, cobalt and manganese in wastewater were investigated. The results show that nickel-ammonia and cobalt-ammonia complex can stably exist in alkaline ammonia-nitrogen wastewater compared with manganese-ammonia complex which is not stable, and become Mn （OH）z precipitate rapidly; moreover, no Ni （ OH）z or Co （OH）3 precipitate forms in the alkaline wastewater in which the concentration of ammonia-nitrogen is more than nickel or cobalt because of the extremely small proportion of nickel or cobalt ions;additionally, the nickel-ammonia complex or cobalt-ammonia complex can be decomplexed by heating with strong alkalinity. The concentration of ammonia-nitrogen, nickel, cobalt and manganese in the treated wastewater all can meet the standards.