Division of Environmental Science and Engineering, Graduate School of Science and Engineering, Yamaguchi University, 2-16-1 Tokiwadai, Ube, Yamaguchi, 755-8611, Japan.
Water Sci Technol. 2012;66(5):1036-43. doi: 10.2166/wst.2012.276.
This study examined the efficiencies of microbubble (MB) treatment, MB treatment with polyaluminium chloride (PAC) as a coagulant, and MB treatment with cetyltrimethylammonium chloride (CTAC) as a cationic surfactant in the separation of emulsified oil (EO) by modified column flotation. Batch mode experiments were conducted by synthesizing emulsified palm oil (d<20 μm), and the chemical oxygen demand (COD) of the influent and effluent was measured to evaluate the treatment performance. MB treatment with PAC and MB treatment with CTAC were found to be more efficient in EO removal than the MB treatment alone. At an EO concentration of ∼1,000 mg L(-1) (pH 7) and under identical treatment conditions (MB generation time: 2.5 min, flotation time: 30 min), MB treatment with PAC (50 mg L(-1)) and that with CTAC (0.5 mg L(-1)) showed equally high EO removal efficiencies of 92 and 89%, respectively. This result is of significant relevance to studies focusing on the development of economical and high-efficiency flotation systems. Furthermore, the effect of pH was investigated by varying the sample pH from 3 to 8, which showed that the EO separation efficiency of MB alone increased drastically from slightly alkaline to acidic condition.
本研究考察了通过改性柱浮选分离乳化油（EO）时，微泡（MB）处理、MB 处理与聚合氯化铝（PAC）作为混凝剂、MB 处理与十六烷基三甲基氯化铵（CTAC）作为阳离子表面活性剂的效率。通过合成乳化棕榈油（d<20 μm）进行批处理实验，并测量进水和出水的化学需氧量（COD）来评估处理性能。MB 处理与 PAC 和 MB 处理与 CTAC 均比单独的 MB 处理更有效地去除 EO。在 EO 浓度约为 1000 mg L(-1)（pH 7）且在相同处理条件下（MB 生成时间：2.5 分钟，浮选时间：30 分钟），PAC（50 mg L(-1)）和 CTAC（0.5 mg L(-1)）的 MB 处理对 EO 的去除效率均高达 92%和 89%，分别。这一结果对于关注经济高效浮选系统开发的研究具有重要意义。此外，还通过将样品 pH 值从 3 变化到 8 来研究 pH 值的影响，结果表明，单独的 MB 对 EO 的分离效率从微碱性急剧增加到酸性条件。
