电镀废水中共存阳离子对Fe(Ⅱ)/O_2去除无机磷的影响  

Effect of co-existing cations on phosphorous removal in ferrous iron oxidation of electroplating wastewater

作　　者：李婷[1] 董文艺[1] 王宏杰[1] 林进南[1] 张岍[1] 欧阳峰[1] 

机构地区：[1]哈尔滨工业大学深圳研究生院,深圳市水资源利用与环境污染控制重点实验室,广东深圳518055

出　　处：《化工学报》2013年第10期3782-3789,共8页CIESC Journal

基　　金：典型行业排水特征污染物脱除成套技术研究与示范项目(2012ZX07206-002-02);住房和城乡建设部研究开发项目:基于曝气生物滤池的城市污水高效脱氮除磷新工艺开发(2012-k7-18)~~

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:NH+4-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1.0mg·L-1时,反应60min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0.05mg·L-1时,除去45%水中磷所需时间由空白的60min缩短为5min,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。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（ III ） 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（ H ）/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.

关 键 词：阳离子 亚铁 磷去除 催化氧化 混凝沉淀 

分 类 号：X522[环境科学与工程—环境工程]