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| Abstract: |
| The regeneration of a spent packing is crucial with respect to the development of circular economy and abstemious society. Thus, the effects of regeneration temperature, resistant time, heating rate, and regeneration cycle on the breakthrough performance of methylene blue (MB) dye-exhausted ceramsite in a two-stage fixed-bed column were studied in this work. Results illustrate that the ceramsite exhibited excellent potential regeneration properties under the following optimal regeneration conditions: treatment temperature was 600 °C, resistant time was 15 min, heating rate was 20 ℃/min, regeneration cycle was over 9 cycles, and the breakthrough time, saturation time, regeneration efficiency (RE), and regeneration loss rate (RLR) were 540 min, 1020 min, 64.61%, and 17.73%, respectively. The RE declined by 35.14% in over 1 cycle, while the RLR increased by 3.15 times in over 9 cycles. Besides, Thomas model was suitable to describe the two-stage fixed-bed column adsorption and thermal regeneration process with R2 = 0.978. In conclusion, a thorough understanding of the regeneration behavior of the two-stage fixed-bed column packed with ceramsite provides reference to obtain an effective and feasible regeneration approach, and it is beneficial for further application in water treatment. |
| Key words: ceramsite thermal regeneration two-stage fixed-bed column breakthrough performance Thomas model |
| DOI：10.11916/j.issn.1005-9113.2018005 |
| Clc Number:X7 |
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| Descriptions in Chinese: |
| 热再生法对陶粒处理亚甲基蓝染料废水穿透行为的影响 李天鹏1, 李亭2 （1.枣庄学院 城市与建筑工程学院, 山东 枣庄 277160; 2.枣庄市元亨机械制造有限公司, 山东 枣庄 277000） 摘要：在固定床操作过程中，有关“失活”填料的再生问题，一直是广大科技工作者关注的焦点。据此，本文开展了不同热再生条件(包括再生温度、停留时间、升温速率及再生次数)对以陶粒为填料的分段式固定床处理亚甲基蓝染料废水穿透行为的影响实验研究。结果表明：在最佳再生温度为600 °C、停留时间为15 min、升温速率为20 °C/min和再生使用9次时，穿透时间、饱和时间、再生效率(RE)和再生质量损失率(RLR)分别为540 min, 1020 min, 64.61% 和17.73%，表明陶粒具有良好的再生能力。与再生使用1次相比，再生使用9次后的RE下降了35.14%，而RLR却增加了3.15倍。此外，Thomas模型适合描述分段式固定床吸附-热再生过程(R2=0.978)。总之，全面了解以陶粒为填料的分段式固定床的再生行为，既有利于选取高效实用的再生方法，又有利于进一步提高其在水处理中的应用。 关键词：陶粒，热再生，分段式固定床，穿透行为，Thomas模型 |
