School of Metallurgy, Northeastern University, Shenyang, 110004, China; Liaoning Key Laboratory of Metallurgical Resources Recycling Science, Shenyang 110004, China.
School of Metallurgy, Northeastern University, Shenyang, 110004, China; Liaoning Key Laboratory of Metallurgical Resources Recycling Science, Shenyang 110004, China.
J Hazard Mater. 2017 Aug 15;336:8-20. doi: 10.1016/j.jhazmat.2017.04.048. Epub 2017 Apr 23.
A novel treatment for chromium, vanadium and ammonium from vanadium industrial wastewater using a byproduct of magnesium-based wet flue gas desulfurization is investigated. In the present study, the byproduct is used as a reductant for chromium and vanadium removal by chemical precipitation, and the residual magnesium ion can also be used to remove ammonium in the present of phosphate by struvite crystallization. Besides, the effects of main operational parameters (reaction pH, byproduct dosage and reaction time) on the heavy metal removal and ammonium removal (reaction pH, Mg:NH:PO molar ratio and reaction time) are investigated, and the reaction mechanism for this treatment technology is also proposed. Under the optimal conditions, the residual concentrations of chromium(IV), total chromium and vanadium are 0.046mg/L, 0.468mg/L and 0.06mg/L, respectively. The removal efficiency of ammonium is 95.72% and the residual concentrations of ammonium and phosphorus are 137.12mg/L and 5.49mg/L, respectively. Additionally, the precipitations are characterized using X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), scanning electron microscope-energy dispersive spectrometer (SEM-EDS) and thermogravimetry differential scanning calorimetry (TG-DSC), respectively. Finally, a resource utilization method of the precipitation sludge from this technology is also presented.
利用镁基湿法烟气脱硫副产物处理含铬、钒和氨氮的含钒工业废水的方法。在本研究中，副产物用作化学沉淀去除铬和钒的还原剂，并且在存在磷酸盐的情况下，残余的镁离子也可以用于通过鸟粪石结晶去除氨氮。此外，研究了主要操作参数（反应 pH 值、副产物用量和反应时间）对重金属去除和氨氮去除（反应 pH 值、Mg:NH:PO 摩尔比和反应时间）的影响，并提出了该处理技术的反应机制。在最佳条件下，六价铬、总铬和钒的残留浓度分别为 0.046mg/L、0.468mg/L 和 0.06mg/L。氨氮的去除率为 95.72%，残留的氨氮和磷浓度分别为 137.12mg/L 和 5.49mg/L。此外，分别采用 X 射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、扫描电子显微镜-能谱仪（SEM-EDS）和热重差示扫描量热法（TG-DSC）对沉淀进行了表征。最后，还提出了该技术沉淀污泥的资源化利用方法。
