Abstract: The interaction of ferrous ions and phosphorous was studied under aerobic conditions in order to assess effectiveness and feasibility of phosphorous removal.Using Fe(Ⅱ)/O₂ and conventional technologies the removal effectiveness of phosphorous in a real electronic waste water and relative economic indicators was compared.For Fe(Ⅱ)/O₂ system the effect of co-existing cations in simulating natural liquid on efficiency of phosphorous removal was examined using variables analysis.The results show that there was no effect of NH₄⁺-N on phosphorous removal by Fe(Ⅱ)/O₂ oxidation.Precipitation could occur between Zn(Ⅱ) and phosphorous in the system,which could promote removal of phosphorous and decrease of ferrous iron consumption.Mn(Ⅱ)as well as OH^- could form complexes with Fe(Ⅲ)generated newly,the complexes are capable of hastening ferrous iron oxidation and also of improving the coagulation of Fe-P sedimentation.As the inventory of Mn(Ⅱ)increased from 0 to 1 mg·L^-1,the removal rate of phosphorous raised 11% after 60 min reaction.Cu(Ⅱ)could remarkably increase the efficiency of phosphorous removal by its catalytic effect.As Cu(Ⅱ)concentration increased from 0 to 0.05 mg·L^-1,the reaction time required 45% phosphotous removal could be reduced from 60 min to 5 min.For a real electronic wastewater the phosphorous removal was better for Fe(Ⅱ)/O₂ system in the presence of the above mentioned cations than for lime alone,while sludge production and economic cost was lower for the former than for the latter.

Key words: co-existing cations, ferrous iron, phosphate removal, catalyzed oxidation, coagulating sedimentation

摘要： 通过序批试验,考察了有氧条件下,共存阳离子对亚铁除磷效率的影响并以实际电子废水为考察对象,对比研究Fe(Ⅱ)/O₂与传统石灰工艺的除磷效果及相关技术经济指标。结果表明:NH₄⁺-N对同步氧化Fe(Ⅱ)除磷效率几乎没有影响;Zn(Ⅱ)可通过与磷酸根反应产生沉淀提高磷的去除率。Mn(Ⅱ)可与新生三价铁形成稳定络合物,促进亚铁氧化并改善铁磷沉淀物混凝沉淀性能,当Mn(Ⅱ)投加量为1.0 mg·L^-1时,反应60 min后,磷的去除率提高11%。Cu(Ⅱ)能高效催化亚铁氧化,从而使亚铁除磷效率显著提高,在Cu(Ⅱ)浓度为0.05 mg·L^-1时,除去45%水中磷所需时间由空白的60 min缩短为5 min,Cu(Ⅱ)是所选共存阳离子中最为高效的亚铁除磷催化剂。以实际电镀废水为研究对象,在共存离子的促进作用下,Fe(Ⅱ)/O₂对废水中磷的去除效果优于传统石灰法,且药剂成本及产泥量均低于直接投加石灰的除磷工艺。

关键词: 阳离子, 亚铁, 磷去除, 催化氧化, 混凝沉淀