Numerical Model of Leachate Recirculation in Bioreactor Landfills with High Kitchen Waste Content
Abstract
:1. Introduction
2. Materials and Methods
2.1. Hydro–Biochem–Mechanical-Coupled Model
2.2. Numerical Cases of Leachate Recirculation in a Typical Kitchen-Waste-Rich Bioreactor Landfill Cell
3. Results and Discussion
3.1. Acceleration of Landfill Stabilization Process
3.2. Moisture Distribution in Landfill Cell and Removal of VFA in Leachate
3.3. Landfill Gas Generation
3.4. Settlement of Landfill Cells
4. Conclusions
- (1)
- The coupled model proposed in this study can well consider the hydraulic behaviors of LR in a BL by considering the fast hydrolysis of kitchen waste and leachate generation due to intraparticle water release at the early stage of the stabilization process. This model enables the investigation of the distribution of leachate and gas in a landfill, providing useful information for the design of the LR system in bioreactor landfills.
- (2)
- Recirculation of leachate has significant effects on accelerating the decomposition of MSW with high kitchen waste content, which can also remove VFA in leachate, promote landfill gas generation, and increase the early settlement in landfills. However, leachate recirculation may lead to a significant increase in pore gas pressure and obvious differential settlement in landfills. Active air extraction and reinforcement of landfill infrastructures are recommended to avoid the adverse effects of LR.
- (3)
- When the daily amount of leachate injection is certain, the vertical well can mitigate the rapid accumulation of pore gas pressure in the landfill during the stable period of landfill gas generation but has the fastest settlement rate, compared to the surface spraying and horizontal trench. The closer MSW is to the LR system, the more obvious the effect will be of the leachate injection.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Parameter | Values | Reference |
---|---|---|
mc (dry basis, wt/wt, %) | 21.4 | Chen et al. [40]; He et al. [45] |
ml (dry basis, wt/wt, %) | 13.9 | |
λiw (g/m3/d) | 60 | |
b (g/m3/d) | 250 (kitchen waste), 100 (other) | Meima et al. [46]; Chen et al. [47] |
kh (m3/g) | 0.1 | |
a | 2.8 | |
kmax (d–1) | 0.1 | |
km (m3/g) | 0.06 | Meima et al. [46]; Chen et al. [47] |
kd (d−1) | 0.01 | |
ks (g/m3) | 4 | |
Y | 0.08 | |
ki (m2) | 6 × 10−12 | Feng et al. [28]; Xu et al. [48] |
μ (kg/m/s) | 1 × 10−3 (μw), 1.4 × 10−5 (μg) | |
α | 0.88 | |
m | 1.6 | |
Ss | 0.95 | |
Sr | 0.2 | |
Dl,c1 (m2/s) | 1.19 × 10−9 | |
Dl,c2 (m2/s) | 1 × 10−9 | |
n0 | 0.75 | Li et al. [49] |
CC’ | 0.205 | Gao et al. [50] |
CC∞’ | 0.074 | |
sb∞ | 0.23 | Chen et al. [44] |
βs (d−1) | 0.2 | |
σ0 (kPa) | 13 | |
ρd (kN/m3) | 34 | Liu et al. [51] |
cm1 | 1.3 | - |
cm2 | 2.1 | |
Nm | 1.75 |
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Zhang, P.; Liu, H.; Jiang, X.; Lv, H.; Cui, C.; Huyan, Z. Numerical Model of Leachate Recirculation in Bioreactor Landfills with High Kitchen Waste Content. Water 2021, 13, 1750. https://doi.org/10.3390/w13131750
Zhang P, Liu H, Jiang X, Lv H, Cui C, Huyan Z. Numerical Model of Leachate Recirculation in Bioreactor Landfills with High Kitchen Waste Content. Water. 2021; 13(13):1750. https://doi.org/10.3390/w13131750
Chicago/Turabian StyleZhang, Peng, Hailong Liu, Xingyao Jiang, Hao Lv, Chunyi Cui, and Zhen Huyan. 2021. "Numerical Model of Leachate Recirculation in Bioreactor Landfills with High Kitchen Waste Content" Water 13, no. 13: 1750. https://doi.org/10.3390/w13131750