Department of Environmental Engineering, Yonsei University, 1 Yonseidae-gil, Wonju 26493, Republic of Korea.
Division of Chemical Engineering, Nanomaterials Processing Research Center, Chonbuk National University, 567 Baekje-daero, Jeounju 54896, Republic of Korea.
Bioresour Technol. 2020 Nov;316:123961. doi: 10.1016/j.biortech.2020.123961. Epub 2020 Aug 6.
In this study, a new recirculation column reactor system for arsenate removal using a polyethylenimine coated bacterial biosorbent was developed. Solution pH was the most important factor in process design and operation. In order to control and optimize solution pH favorable for arsenate removal, a pH control and recirculation system was added to a column reactor. The effects of recycle ratio, initial arsenate concentration, and flow rate on the arsenate removal performance of the developed process were examined. Thomas and Yoon-Nelson models were used to interpret the breakthrough curve of arsenate removal. The maximum arsenate adsorption amount of the new reactor was determined to be 50.86 mg/g by the Thomas model. Importantly, the new reactor showed unimpeded adsorption performance compared with that in the batch experiments. The desorption study also showed excellent reusability. The results indicated that the newly developed process could be a promising application prospect for removing arsenate.
在这项研究中，开发了一种使用聚乙烯亚胺涂覆细菌生物吸附剂的新型循环柱反应器系统，用于去除砷酸盐。溶液 pH 值是工艺设计和操作中最重要的因素。为了控制和优化有利于去除砷酸盐的溶液 pH 值，在柱式反应器中添加了 pH 值控制和再循环系统。考察了循环比、初始砷酸盐浓度和流速对开发工艺去除砷酸盐性能的影响。Thomas 和 Yoon-Nelson 模型用于解释砷酸盐去除的穿透曲线。Thomas 模型确定新型反应器的最大砷酸盐吸附量为 50.86mg/g。重要的是，与批实验相比，新型反应器显示出无阻的吸附性能。解吸研究也表明了极好的可重复使用性。结果表明，新开发的工艺在去除砷酸盐方面可能具有广阔的应用前景。
