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Arid Land Geography ›› 2023, Vol. 46 ›› Issue (9): 1467-1480.doi: 10.12118/j.issn.1000-6060.2022.499

• Biology and Pedology • Previous Articles     Next Articles

Effect of plant fiber blanket cover on hydrothermal distribution of tailing sand in arid area

WANG Xin1,2,3(),JIN Zhengzhong1,2(),SHI Jianfei1,2,3,YANG Xiaoliang1,2,3,XU Xinwen1,2   

  1. 1. National Engineering Technology Research Center for Desert-Oasis Ecological Construction, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China
    2. Mosuowan Desert Research Station, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Shihezi 832000, Xinjiang, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2022-10-01 Revised:2022-11-21 Online:2023-09-25 Published:2023-09-28

Abstract:

Because the cover affects the water and heat distribution of mine tailings, studying the effect of plant fiber blanket cover on the hydrothermal distribution of tailing sand is critical for regulating hydrothermal conditions in microbial induced calcite precipitation (MICP) technology to mitigate tailings pollution. In the summer of 2022, a field simulation experiment was conducted using plant fiber blankets of various materials (jute, straw, coconut silk, and palm) and specifications (300 g·m-2, 500 g·m-2, 700 g·m-2, and 900 g·m-2) to cover tailing sand at the Mosuo Wan Desert Research Station, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences. The influence of the plant fiber blanket covering on the water and heat distribution of tailing sand was investigated by measuring the change in the temperature, water content, and evaporation of tailing sand. The results revealed that (1) The plant fiber blanket covers reduced the temperature, daily temperature difference, and daily variation of tailing sand at a depth of 0-20 cm. The 900 g·m-2 straw fiber blanket (D9) exhibited the strongest cooling effect and smallest daily variation. (2) The plant fiber blanket covers improved water retention and reduced the water evaporation loss of tailing sand at a depth of 0-30 cm. (3) The plant fiber blanket covers can inhibit the evaporation of water from tailing sand. The test results revealed that cumulative evaporation inhibition efficiency under the same specification except D9 was slightly greater than 900 g·m-2 jute fiber blanket (H9), and followed the order jute>straw>palm>coconut silk. The evaporation efficiency of all materials increased with the increase in specifications, with D9 inhibiting evaporation efficiency up to 71.3%. (4) D9 was the best water saving and cooling solution for plant fiber blanket covering tailing sand in arid areas. The plant fiber blanket covers can effectively save water and reduce temperature. Furthermore, the results of the study can provide theoretical support for the application of MICP technology in arid areas to control hydrothermal conditions in the pollution dispersion of tailings.

Key words: tailing sand, plant fiber blanket, temperature, water retention, evaporation