Application of nuclear track membrane in tea filtration

Lin ZHANG; Dan MO; Tiandong DING

doi:10.11889/j.0253-3219.2018.hjs.41.010502

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Application of nuclear track membrane in tea filtration

NUCLEAR PHYSICS, INTERDISCIPLINARY RESEARCH | 更新时间：2021-05-19

- Application of nuclear track membrane in tea filtration
- NUCLEAR TECHNIQUES Vol. 41, Issue 1, Article number: 010502(2018)
- 作者机构：
  
  1.中国科学院近代物理研究所兰州 730000
  2.中国科学院大学北京 100049
  3.武威科近新发技术有限责任公司武威 733000
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China
- DOI：10.11889/j.0253-3219.2018.hjs.41.010502
  CLC： TL99;TS272;TU991.24
- Received：15 September 2017，
  
  Revised：02 November 2017，
  
  Published：10 January 2018
- 稿件说明：
移动端阅览
Lin ZHANG, Dan MO, Tiandong DING. Application of nuclear track membrane in tea filtration[J]. Nuclear techniques, 2018, 41(1): 010502
DOI：

Lin ZHANG, Dan MO, Tiandong DING. Application of nuclear track membrane in tea filtration[J]. Nuclear techniques, 2018, 41(1): 010502 DOI： 10.11889/j.0253-3219.2018.hjs.41.010502.

摘要

利用兰州重离子加速器提供的25 MeV·u

-1

26+

离子辐照的聚对苯二甲酸乙二醇酯薄膜蚀刻制备了多种规格核孔膜；针对饮茶时残存杯底的茶垢，用核孔膜开展了一系列茶汤过滤实验及滤后分析。过滤方法为螺旋平板小试仪上进行的死端过滤。对过滤后的茶汤和滤后膜表面分别进行了激光粒度、浊度色度、扫描电镜等分析，证明对茶汤除杂的有效性，观察截留的颗粒物形态；用流速测定的方法记录了滤膜的流速衰减过程；对流速和过滤效果俱佳的15 μm核孔膜进行了在水壶中冲泡的耐久性测试，提出了核孔膜污染后可能的清洗方法。本文探讨了过滤过程初始流速对滤膜寿命的影响，指出控制初始流速是一种核孔膜过滤的优化操作，具有一定参考意义。

Abstract

Background

People keen on tasting tea are plagued by the presence of crushed impurities in the tea soup

such as particles of tea leaf and hairs of tea leaf.

Purpose

The aim is to expand the use of nuclear track membranes (NTMs) for filtration of tea soup.

Methods

Flat membrane filtration equipment with the NTM placed in is used to separate the tea soup.

Results

The colority and turbidity of tea soup after the separation decrease with the intercept aperture. The total volume of residual particles in tea soup decreases with pore size; the peaks of size distribution of particles decrease with the pore size. The flux of NTM is good and decreases with the pore size. After cleaning

membrane flux of 15-μm NTM can be restored to more than 80% of the original. It is found that the membrane can extend the life time and improve economic efficiency by controlling the initial flow rate.

Conclusion

NTM can effectively intercept the particles larger than its pore size in the tea soup. The 15-μm NTM is the best to separate the tea soup with the excellent flux and retention effect during gravity

and 1-μm NTM is the best choice under pressure filtration.

关键词

Keywords

references

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