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SCIENCE CHINA Technological Sciences, Volume 62 , Issue 11 : 1907-1915(2019) https://doi.org/10.1007/s11431-018-9443-4

Effect of intracellular water release on hydro-mechanical behaviors of high kitchen waste content municipal solid waste

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  • ReceivedJun 9, 2018
  • AcceptedJan 14, 2019
  • PublishedOct 8, 2019

Abstract

The release of intracellular water during degradation process contributes to the great leachate production and settlement of landfilled high kitchen waste content MSW (HKWC-MSW). An oven-drying and absorbent-paper combined method was proposed to measure the intracellular and interparticle water contents of HKWC-MSW. Two degradation experiments were carried out to study the release process of intracellular water and its effect on the hydro-mechanical behaviors of HKWC-MSW. It was found that the two degradation experiments showed similar degradation behaviors with BOD/COD decreasing with time in the early stage. In the first degradation experiment, most intracellular water was released during the first two months, and the degradation of degradable matter in kitchen waste (KW) was much slower than the release process of intracellular water. The particle size became smaller and the overall grain specific gravity increased during the fast release process of intracellular water. In the second degradation experiment, after two-year degradation, the total leachate production was about 45.2% of the initial wet weight of HKWC-MSW specimen. Water retention capacity θf €increased from 0.23 to 0.58 during 1–69 d, which might be caused by the decrease of particle size and compression of waste skeleton. As almost all the intracellular water was released after 80-day degradation, during the latter stage of leachate drainage under gravity, θf €decreased and was close to the total volumetric water content. The total compression strain was about 0.39. The secondary compression strain during 1–80 d (i.e., about 0.07) was considered to be mainly resulted by the release of intracellular water and the subsequent drainage of leachate, and it accounted for about 22.6% of the total secondary compression strain.


Funded by

the National Basic Research Program of China(Grant,No.,2012CB719800)

the National Natural Science Foundation of China(Grant,Nos.,51708508,41402249)

and the Zhejiang Provincial Natural Science Foundation of China(Grant,Nos.,LY17E080021,LY15E080021)


Acknowledgment

This work was supported by the National Basic Research Program of China (Grant No. 2012CB719800), the National Natural Science Foundation of China (Grant Nos. 51708508, 41402249), and the Zhejiang Provincial Natural Science Foundation (Grant Nos. LY17E080021, LY15E080021).


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  • Figure 1

    (Color online) Synthetic fresh HKWC-MSW.

  • Figure 2

    Schematic profile of the degradation cylinders.

  • Figure 3

    Flow chart of the oven-drying and absorbent-paper combined method.

  • Figure 4

    (Color online) Weight change of KW specimens in the verification test.

  • Figure 5

    (Color online) Leachate properties. (a) pH; (b) BOD; (c) COD; (d) BOD/COD.

  • Figure 6

    (Color online) Weight change of intracellular water, dry KW and dry non-KW.

  • Figure 7

    Particle size distribution curves of KW (a), non-KW (b) and the whole MSW specimen (c).

  • Figure 8

    Grain specific gravity of KW, non-KW and the whole MSW specimen.

  • Figure 9

    (Color online) Settlement and leachate production of MSW specimen.

  • Figure 10

    (Color online) Total volumetric water content and water retention capacity of MSW specimen.

  • Table 1   Composition of synthetic fresh HKWC-MSW

    KW

    Vegetable leaves

    Fruit peel

    Meat & bones

    Rice

    Tree leaves & grass

    Composition (kg/kg, wet basis)

    41.35%

    20.55%

    3.50%

    1.20%

    0.70%

    Intracellular water content (kg/kg, wet basis)

    91.6%

    92%

    55%

    56%

    89%

    Non-KW

    Paper

    Plastic & rubber

    Textile

    Cinder & dust

    Metal & glass

    Composition (kg/kg, wet basis)

    6.66%

    8.20%

    0.60%

    15.14%

    1.50%

    Intracellular water content (kg/kg, wet basis)

    0

    0

    0

    0

    0

  • Table 2   Fresh KW specimens for the verification test

    Fresh KW specimen No.

    Initial wet weight at natural state (×10–3 kg)

    Weight of water added in fresh KW (×10–3 kg)

    K-1

    174.00

    35.00

    K-2

    183.00

    27.00

    K-3

    185.00

    0.00

  • Table 3   MSW specimens for the BOD/COD and phase relationship parameters tests

    MSW specimen No.

    Degradation time (d)

    M-1

    0

    M-2

    14

    M-3

    20

    M-4

    30

    M-5

    40

    M-6

    50

    M-7

    60

  • Table 4   Results of the verification test on KW

    Fresh KWspecimen No.

    Weight of intracellularwater (×10–3 kg)

    Intracellular water content(kg/kg, wet basis)

    Measured weight ofintracellular water (×10–3 kg)

    Measured intracellular watercontent (kg/kg, wet basis)

    K-1

    155.2

    89.2%

    166.2

    89.8%

    K-2

    163.2

    89.2%

    167.2

    89.4%

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