Talaiekhozani Amirreza, Salari Malihe, Talaei Mohammad Reza, Bagheri Marzieh, Eskandari Zeynab
Civil Engineering Department, Jami Institute of Technology, Isfahan, Iran.
Chemical Engineering Department, Jami Institute of Technology, Isfahan, Iran.
J Environ Manage. 2016 Dec 15;184(Pt 2):204-209. doi: 10.1016/j.jenvman.2016.09.084. Epub 2016 Oct 4.
Formaldehyde removal from an air stream absorbed into a water stream in a packed bed continuously and then removed by employing a combination of UV and ferrate(VI) as a highly-powerful oxidant in a continuous stirred tank. In addition, the removal of formaldehyde from water was investigated in both batch and continuous modes. The results of the study performed on formaldehyde-contaminated water treatment can be used for both air and water treatment process design. The primary objective of this study is to compare the performance of using UV and ferrate(VI) individually with that of using UV/ferrate(VI) simultaneously to remove formaldehyde from both air and water. Moreover, the effects of several factors such as pH, ferrate(VI) concentration and temperature on formaldehyde removal from water using ferrate(VI) method were evaluated. The results of the current study in batch condition showed that the best initial pH and ferrate(VI) concentration to obtain the highest formaldehyde removal are 2 and 1 mg/l, respectively. The results of this part of research also reveal that temperatures rise from 25 °C to 50 °C increases formaldehyde removal from 69% to 97%; however, further increase in temperature has an adverse effect on removal efficiency. The combination of UV and ferrate(VI) enhances formaldehyde removal efficiency to very close to 100% within 35 min. In continuous air stream treatment, maximum formaldehyde removal of 94% was obtained by using a packed bed scrubber with gas over liquid flow rates ratio of 1.28 m/m. Although the results of this study shows that ferrate(VI) method for removal of formaldehyde can be considered as a promising alternative for both water and air treatment, further economic studies are required for this process to be commercialized.
在填充床中，甲醛从气流中被连续吸收到水流中，然后在连续搅拌槽中通过使用紫外线和高铁酸盐（VI）作为高功率氧化剂进行去除。此外，还研究了在间歇和连续模式下从水中去除甲醛的情况。对受甲醛污染的水处理进行的研究结果可用于空气和水处理工艺设计。本研究的主要目的是比较单独使用紫外线和高铁酸盐（VI）与同时使用紫外线/高铁酸盐（VI）从空气和水中去除甲醛的性能。此外，还评估了pH值、高铁酸盐（VI）浓度和温度等几个因素对使用高铁酸盐（VI）法从水中去除甲醛的影响。当前间歇条件下的研究结果表明，获得最高甲醛去除率的最佳初始pH值和高铁酸盐（VI）浓度分别为2和1mg/l。这部分研究结果还表明，温度从25℃升高到50℃时，甲醛去除率从69%提高到97%；然而，温度进一步升高对去除效率有不利影响。紫外线和高铁酸盐（VI）的组合可在35分钟内将甲醛去除效率提高到非常接近100%。在连续气流处理中，使用气液流速比为1.28m/m的填充床洗涤器可获得94%的最大甲醛去除率。尽管本研究结果表明，高铁酸盐（VI）法去除甲醛可被视为水和空气处理的一种有前景的替代方法，但该工艺要实现商业化还需要进一步的经济研究。
