Wang Qian, Miao Qianming, Huang Ke, Lin Yeqi, Wang Tong, Bai Xinyue, Xu Qiyong
School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen 518055, PR China.
School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen 518055, PR China.
Waste Manag. 2023 Aug 31;171:163-172. doi: 10.1016/j.wasman.2023.08.036.
The clogging of leachate collection systems (LCSs) is a typical challenge for landfills operation. Although clogging occurs in different LCS components, its spatial-temporal distributions remain unclear. This study aimed to systematically investigate the dynamic clogging development in simulated LCSs by monitoring changes in clogging characteristics over time. Results revealed that clogging accumulated in all components of the simulated LCS during a 215-day period, including chemical clogging and bio-clogging. Distinct spatial variations in clogging components were observed along the leachate flow of the simulated LCS, with the geotextile being severely clogged due to bio-clogging (70.1 ± 3.0%-80.0 ± 0.5%). Additionally, chemical clogging mainly occurred at the top (85.4 ± 0.8%-95.0 ± 0.9%) and middle (91.2 ± 0.8%-94.9 ± 1.1%) gravel layers. Nevertheless, the percentage of chemical clogging decreased from 72.0 ± 2.1% (day 42) to 42.5 ± 2.7% (day 215) at the bottom gravel layer. Chemical clogging was the main type in the pipe, accounting for 69.6 ± 0.5% (day 215). In addition, the ratios of bio-clogging to chemical clogging changed over time in all LCS components. The spatial-temporal characteristics of clogging across LCS components can enhance the understanding of clogging mechanisms, facilitate the design optimization of LCSs, and promote the formulation of effective control strategies.
渗滤液收集系统（LCSs）的堵塞是垃圾填埋场运营面临的一个典型挑战。尽管堵塞发生在不同的LCS组件中，但其时空分布仍不明确。本研究旨在通过监测堵塞特征随时间的变化，系统地研究模拟LCSs中的动态堵塞发展情况。结果表明，在215天的时间里，模拟LCS的所有组件中都积累了堵塞，包括化学堵塞和生物堵塞。沿着模拟LCS的渗滤液流动方向，观察到堵塞组件存在明显的空间变化，土工织物由于生物堵塞而严重堵塞（70.1±3.0%-80.0±0.5%）。此外，化学堵塞主要发生在顶部（85.4±0.8%-95.0±0.9%）和中部（91.2±0.8%-94.9±1.1%）的砾石层。然而，底部砾石层的化学堵塞百分比从第42天的72.0±2.1%降至第215天的42.5±2.7%。化学堵塞是管道中的主要堵塞类型，占第215天的69.6±0.5%。此外，所有LCS组件中生物堵塞与化学堵塞的比例随时间变化。LCS组件堵塞的时空特征有助于加深对堵塞机制的理解，促进LCS的设计优化，并推动有效控制策略的制定。
