Zhang Ruichi, Walder Ingar, Leiviskä Tiina
Chemical Process Engineering, University of Oulu, P.O. Box 4300, FIN-90014 Oulu, Finland.
Kjeøy Research & Education Center, Vestbygd, Norway.
J Hazard Mater. 2021 Aug 15;416:125961. doi: 10.1016/j.jhazmat.2021.125961. Epub 2021 Apr 29.
This study investigated the removal of vanadium from mining waters at a closed mine site (Mustavaara, Finland) using granular ferric oxyhydroxide (CFH-12) on pilot scale. Two filter systems, pilot A and pilot B, were placed in different streams, where the influent in pilot A contained a higher and very variable vanadium concentration (6.46-99.1 mg/L), while the pilot B treated influent had lower vanadium concentrations (0.443-2.33 mg/L). The operation periods were 51 days for pilot A and 127 days for pilot B. Water quality analyses revealed that vanadium was efficiently captured in the filter system in both pilots. X-ray fluorescence analysis revealed that the filter beds were not fully saturated with vanadium. X-ray photoelectron spectroscopy confirmed that oxidised vanadium (5) existed in the used CFH-12 and the carbon content in the used material had increased due to the adsorbed organic compounds. For comparison, lab-scale coagulation experiments were conducted using ferric sulphate for the influent of pilot A (the sampled batch contained 15.9 mg/L V). The optimum coagulant dosage was 350 mg/L (>93% vanadium removal) at the original pH (7.8-7.9) of the influent, whereas the required coagulant amount decreased when the influent pH was adjusted to 4.6-4.8.
本研究在中试规模下，使用粒状羟基氧化铁（CFH - 12）对芬兰一个封闭矿区（穆斯塔瓦拉）矿坑水中的钒去除情况进行了调查。两个过滤系统，即中试A和中试B，放置在不同的溪流中，中试A的进水钒浓度较高且变化很大（6.46 - 99.1毫克/升），而中试B处理的进水钒浓度较低（0.443 - 2.33毫克/升）。中试A的运行期为51天，中试B为127天。水质分析表明，两个中试的过滤系统都能有效捕获钒。X射线荧光分析表明，滤床未被钒完全饱和。X射线光电子能谱证实，使用过的CFH - 12中存在氧化态钒（V），且由于吸附了有机化合物，使用过的材料中的碳含量有所增加。为作比较，对中试A的进水（采样批次含15.9毫克/升钒）进行了使用硫酸铁的实验室规模混凝实验。在进水初始pH值（7.8 - 7.9）下，最佳混凝剂投加量为350毫克/升（钒去除率>93%），而将进水pH值调至4.6 - 4.8时，所需的混凝剂用量减少。
