EFFECTS OF METHANE EMISSION REDUCTION IN EARTHEN LANDFILL COVER BY SINGLE AND MIXED PLANT SPECIES DURING DRYING-WETTING CYCLES

LIU Hongwei; BIAN Xiaoran; FENG Song; ZHANG Ying; CHENG Yangjian

doi:10.13205/j.hjgc.202310022

Volume 41 Issue 10

Oct. 2023

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LIU Hongwei, BIAN Xiaoran, FENG Song, ZHANG Ying, CHENG Yangjian. EFFECTS OF METHANE EMISSION REDUCTION IN EARTHEN LANDFILL COVER BY SINGLE AND MIXED PLANT SPECIES DURING DRYING-WETTING CYCLES[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(10): 185-194. doi: 10.13205/j.hjgc.202310022

Citation:

LIU Hongwei, BIAN Xiaoran, FENG Song, ZHANG Ying, CHENG Yangjian. EFFECTS OF METHANE EMISSION REDUCTION IN EARTHEN LANDFILL COVER BY SINGLE AND MIXED PLANT SPECIES DURING DRYING-WETTING CYCLES[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(10): 185-194. doi: 10.13205/j.hjgc.202310022

Citation:

LIU Hongwei, BIAN Xiaoran, FENG Song, ZHANG Ying, CHENG Yangjian. EFFECTS OF METHANE EMISSION REDUCTION IN EARTHEN LANDFILL COVER BY SINGLE AND MIXED PLANT SPECIES DURING DRYING-WETTING CYCLES[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(10): 185-194. doi: 10.13205/j.hjgc.202310022

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EFFECTS OF METHANE EMISSION REDUCTION IN EARTHEN LANDFILL COVER BY SINGLE AND MIXED PLANT SPECIES DURING DRYING-WETTING CYCLES

doi: 10.13205/j.hjgc.202310022

1. Sichuan Highway Planning, Survey, Design and Research Institute, Chengdu 610041, China;
2. Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China;
3. College of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;
4. School Advanced Manufacturing, Fuzhou University, Jinjiang 362251, China;
5. College of Civil Engineering, Fuzhou University, Fuzhou 350108, China;
6. College of Environment & Safety Engineering, Fuzhou University, Fuzhou 350108, China

Received Date: 2023-04-10
Available Online: 2023-12-26

Abstract

Abstract

The effects of single-species (Cynodon dactylon) and mixed-species (Schefflera and Cynodon dactylon) on methane emission reduction in landfill cover were studied under the drying-wetting cycles. Three-layer landfill cover consists of a machine-made sand tailing mixed with 10% bentonite, gravel layer and silty sand layer. A total of four drying-wetting cycle tests were conducted. Throughout these tests, measurements were taken for plant growth, soil moisture content, and gas pressure changes in each layer of soil column. Additionally, gas concentration of each component was monitored. The results demonstrate that landfill gas inhibited the plants growth, causing leaf wilting and reduced photosynthesis and transpiration rates. The mixed-species group showed a higher methane oxidation capacity, compared to the single-species group. The methane removal rate of the single-species was approximately 69%~89% of that observed in the mixed-species group. The difference in methane oxidation capacity between the mixed-species group and single-species group increased with the increase in drying-wetting cycle number. After four drying-wetting cycles, both the mixed-species and single-species group showed a decrease in methane oxidation capacity. The mixed-species group reached approximate 45% of its peak value from the first drought, while the single-species group achieved around 34% of its initial peak value. Plant roots enhanced the soil's methane oxidation capacity, and the methane oxidation capacity inside the root zone was greater than that outside the root zone. This study elucidated the influence of plant combinations on methane oxidation under drying-wetting cycles. The test results provide a solid basis for mitigating methane emissions in landfills.
- drying-wetting cycle,
- combination of plants,
- methane emission reduction,
- three-layer landfill cover,
- soil column test

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References(47)

References

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