“混凝沉淀+纳米零价铁”处理印刷电路板生产废水中试研究

提出一种新纳米零价铁反应器(Nanoscale Zero-Valent Iron Reactor,简称NIR)及"混凝沉淀+纳米零价铁"处理工艺,通过实际生产废水进行中试,考察和研究该工艺和NIR技术处理江苏省某市印刷电路板(Printed Circuit Board,简称PCB)工业园区废水的效果。结果表明,此工艺对PCB生产废水中Cu、TP及COD Cr去除率分别可达到97.3%、73.7%、26%,其中Cu处理效果最佳;XRD结果表明,纳米零价铁(Nanoscale Zero-Valent Iron,nZVI)与PCB生产废水反应后含有γ-Fe2O3、Fe3O4、γ-FeOOH、CuO、Cu2O、Cu0等产物。"混凝沉淀+纳米零价铁"工艺处理废水时具有处理效果好、工艺耐冲击性能好、产泥量小、不易造成二次污染等优点。

Pilot Study on Treatment of Printed Circuit Board Wastewater with ＂Coagulation and Sedimentation ＋ Nanoscale Zero-Valent Iron Reactor＂ Process

In this paper,the design of the new nanoscale Zero-Valent Iron Reactor （NIR） and ＂Coagulation and Sedimentation ＋ nanoscale Zero-Valent Iron＂ process were introduced,and a pilot-scale test was conducted to treatment wastewater from a printed circuit board （PCB） plant in Jiangsu Province,the treatment efficiency was investigated.The results showed that the removal efficiency of the process on Cu,TP and CODCr were 97.3％,73.7％,and 26％,respectively.Removal efficiency of Cu was especially good.The results of XRD investigation showed that the wastewater of printed circuit board treated by Nanoscale Zero-Valent Iron （nZVI） contained γ-Fe2O3,Fe3O4,γ-FeOOH,CuO,Cu2O,Cu0.Compared to conventional methods of PCB wastewater treatment,＂Coagulation and Sedimentation ＋ Nanoscale Zero-Valent Iron＂ process shows the advantages of better effect,resistance to impact,low sludge production and no secondary pollution.