SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (3): 528-533.DOI: 10.1016/j.cjche.2018.06.027

• Separation Science and Engineering • Previous Articles     Next Articles

Removing ammonia from skim by air stripping with rotating packed bed

Hongxing Gui1, Xiuping Li2,3   

  1. 1 Danzhou Investigation & Experiment Station of Tropical Crops, Ministry of Agriculture, Danzhou 571737, China;
    2 School of Chemical and Engineering, North University of China, Taiyuan 030051, China;
    3 Shanxi Provincial Key Laboratory of Ultra-Gravity Chemical Engineering, Taiyuan 030051, China
  • Received:2018-02-25 Revised:2018-06-18 Online:2019-04-25 Published:2019-03-28
  • Contact: 10.1016/j.cjche.2018.06.027
  • Supported by:

    Supported by the Opening Project Fund of Key Laboratory of Danzhou Investigation&Experiment Station of Tropical Crops,Ministry of Agriculture (RRI-KLOF201701).

Removing ammonia from skim by air stripping with rotating packed bed

Hongxing Gui1, Xiuping Li2,3   

  1. 1 Danzhou Investigation & Experiment Station of Tropical Crops, Ministry of Agriculture, Danzhou 571737, China;
    2 School of Chemical and Engineering, North University of China, Taiyuan 030051, China;
    3 Shanxi Provincial Key Laboratory of Ultra-Gravity Chemical Engineering, Taiyuan 030051, China
  • 通讯作者: Xiuping Li,E-mail address:lixiuping@nuc.edu.cn
  • 基金资助:

    Supported by the Opening Project Fund of Key Laboratory of Danzhou Investigation&Experiment Station of Tropical Crops,Ministry of Agriculture (RRI-KLOF201701).

Abstract: Based on the effects of skim components on ammonium removal as well as the current processing technology, a new process-intensified technology of removing ammonia from skim by air stripping on rotating packed bed was proposed. The experiments were conducted on a wave-thread packed Rotating Packed Bed (RPB) under atmospheric pressure, suggesting that, in terms of order of importance, the ammonium concentration of feed-stock (xw), the average ultra-gravity factor (β), feed-stock flux (L), and gas flux (G) had significant impact on ammonium removal rate (η) and the ammonium concentration of products (xD). In the experiment, mass-transfer coefficient in gas phase (kyae) increases with the increase of β, G/L, and L. The ammonium concentration of products decreases with the increase of β, G/L and the increase of L. The ammonium concentration of products would be as low as 0.10% and the ammonia removal rate would be 63.21% when skim temperature was 25℃, xw 0.28%, β 133.2, and G/L 15.0 m3·L-1. Experiment results indicated that the proposed technology for removing ammonium from skim on a rotating packed bed would be a new process-intensified technique compared with traditional aeration process and centrifugal atomization method.

Key words: Skim, Ammonia removal, Ultra-gravity technology, Air stripping

摘要: Based on the effects of skim components on ammonium removal as well as the current processing technology, a new process-intensified technology of removing ammonia from skim by air stripping on rotating packed bed was proposed. The experiments were conducted on a wave-thread packed Rotating Packed Bed (RPB) under atmospheric pressure, suggesting that, in terms of order of importance, the ammonium concentration of feed-stock (xw), the average ultra-gravity factor (β), feed-stock flux (L), and gas flux (G) had significant impact on ammonium removal rate (η) and the ammonium concentration of products (xD). In the experiment, mass-transfer coefficient in gas phase (kyae) increases with the increase of β, G/L, and L. The ammonium concentration of products decreases with the increase of β, G/L and the increase of L. The ammonium concentration of products would be as low as 0.10% and the ammonia removal rate would be 63.21% when skim temperature was 25℃, xw 0.28%, β 133.2, and G/L 15.0 m3·L-1. Experiment results indicated that the proposed technology for removing ammonium from skim on a rotating packed bed would be a new process-intensified technique compared with traditional aeration process and centrifugal atomization method.

关键词: Skim, Ammonia removal, Ultra-gravity technology, Air stripping