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Dr. Hailong Liu
Dalian Maritime University

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0 Geo-environmental Engineering
0 Geotechnical Engineering
0 Landfill
0 civil engineering
0 Coupled Model

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Journal article
Published: 24 June 2021 in Water
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Surface spraying, horizontal trenches, and vertical wells are the most common leachate recirculation system used at landfills in engineering practice. In order to quantify the efficiency of the three aforementioned recirculation systems, a hydro–biochem–mechanical-coupled model was developed in the present work, which can describe hydrodynamic and biochemical behaviors in food-waste-rich landfills. A typical landfill cell was modeled in COMSOL. The results indicate that leachate recirculation can accelerate the decomposition of municipal solid waste (MSW) with food-rich waste content, relieving acidification, improving gas generation efficiency, and consequently, increasing the early settlement in landfills.

ACS Style

Peng Zhang; Hailong Liu; Xingyao Jiang; Hao Lv; Chunyi Cui; Zhen Huyan. Numerical Model of Leachate Recirculation in Bioreactor Landfills with High Kitchen Waste Content. Water 2021, 13, 1750 .

AMA Style

Peng Zhang, Hailong Liu, Xingyao Jiang, Hao Lv, Chunyi Cui, Zhen Huyan. Numerical Model of Leachate Recirculation in Bioreactor Landfills with High Kitchen Waste Content. Water. 2021; 13 (13):1750.

Chicago/Turabian Style

Peng Zhang; Hailong Liu; Xingyao Jiang; Hao Lv; Chunyi Cui; Zhen Huyan. 2021. "Numerical Model of Leachate Recirculation in Bioreactor Landfills with High Kitchen Waste Content." Water 13, no. 13: 1750.

Research article
Published: 03 March 2021 in Advances in Civil Engineering
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Accelerating the waste mineralization is of great significance to control the settlement of transportation facilities nearby landfills. Mineralized waste can also be used as road construction materials to recycle waste resources and reduce the construction cost of transportation facilities. A biochem-hydro-mechanical-solute migration-coupled model for describing complex interactions in landfills with high kitchen waste content has been developed. The proposed model can consider large leachate production and landfill gas entrapment due to the fast degradation of kitchen waste. The quantitative effects of three leachate recirculation conditions are investigated in this article via a typical landfill cell. According to the simulation results, introducing methanogen into landfills with leachate recirculation can relieve acidification caused by fast hydrolysis of kitchen waste and speed up the mineralization process of landfills with high kitchen waste content significantly. Furthermore, landfill gas generation potential loss and fast degradation compression should be considered in the implementation of leachate recirculation in landfills with high kitchen waste content, which helps to maintain the operation of transportation facilities nearby landfills and improve the economic and environmental benefits of leachate treatment.

ACS Style

Hailong Liu; Zhen Huyan; Chunyi Cui; Xiang Luo; Xingyao Jiang. Evaluation of Leachate Recirculation Effect on the Acceleration of Waste Mineralization Process by Using a Coupled Numerical Model. Advances in Civil Engineering 2021, 2021, 1 -10.

AMA Style

Hailong Liu, Zhen Huyan, Chunyi Cui, Xiang Luo, Xingyao Jiang. Evaluation of Leachate Recirculation Effect on the Acceleration of Waste Mineralization Process by Using a Coupled Numerical Model. Advances in Civil Engineering. 2021; 2021 ():1-10.

Chicago/Turabian Style

Hailong Liu; Zhen Huyan; Chunyi Cui; Xiang Luo; Xingyao Jiang. 2021. "Evaluation of Leachate Recirculation Effect on the Acceleration of Waste Mineralization Process by Using a Coupled Numerical Model." Advances in Civil Engineering 2021, no. : 1-10.

Journal article
Published: 20 February 2021 in Sustainability
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Calcium sulfoaluminate cement (CSA) was used to stabilize a type of marine soft soil in Dalian China. Unconfined compressive strength (UCS) of CSA-stabilized soil was tested and compared to ordinary Portland cement (OPC); meanwhile the influence of amounts of gypsum in CSA and cement contents in stabilized soils on the strength of stabilized soils were investigated. X-ray diffraction (XRD) tests were employed to detect generated hydration products, and scanning electron microscopy (SEM) was conducted to analyze microstructures of CSA-stabilized soils. The results showed that UCS of CSA-stabilized soils at 1, 3, and 28 d firstly increased and then decreased with contents of gypsum increasing from 0 to 40 wt.%, and CSA-stabilized soils exhibited the highest UCS when the content of gypsum equaled 25 wt.%. When the mixing amounts of OPC and CSA were the same, CSA-stabilized soils had a significantly higher early strength (1 and 3 d) than OPC. For CSA-stabilized soil with 0 wt.% gypsum, monosulfate (AFm) was detected as a major hydration product. As for CSA-stabilized soil with certain amounts of gypsum, the intensity of ettringite (Aft) was significantly higher than that in the sample hydrating without gypsum, but a tiny peak of AFm also could be detected in the sample with 15 wt.% gypsum at 28 d. Additionally, the intensity of AFt increased with the contents of gypsum increasing from 0 to 25 wt.%. When contents of gypsum increased from 25 to 40 wt.%, the intensity of AFt tended to decrease slightly, and residual gypsum could be detected in the sample with 40 wt.% gypsum at 28 d. In the microstructure of OPC-stabilized soils, hexagonal plate-shaped calcium hydroxide (CH) constituted skeleton structures, and clusters of hydrated calcium silicates (C-S-H) gel adhered to particles of soils. In the microstructure of CSA-stabilized soils, AFt constituted skeleton structures, and the crystalline sizes of ettringite increased with contents of gypsum increasing; meanwhile, clusters of the aluminum hydroxide (AH3) phase could be observed to adhere to particles of soils and strengthen the interaction.

ACS Style

Hailong Liu; Jiuye Zhao; Yu Wang; Nangai Yi; Chunyi Cui. Strength Performance and Microstructure of Calcium Sulfoaluminate Cement-Stabilized Soft Soil. Sustainability 2021, 13, 2295 .

AMA Style

Hailong Liu, Jiuye Zhao, Yu Wang, Nangai Yi, Chunyi Cui. Strength Performance and Microstructure of Calcium Sulfoaluminate Cement-Stabilized Soft Soil. Sustainability. 2021; 13 (4):2295.

Chicago/Turabian Style

Hailong Liu; Jiuye Zhao; Yu Wang; Nangai Yi; Chunyi Cui. 2021. "Strength Performance and Microstructure of Calcium Sulfoaluminate Cement-Stabilized Soft Soil." Sustainability 13, no. 4: 2295.

Journal article
Published: 22 January 2021 in Sustainability
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Improving the understanding of the stabilization process is of great significance to guide the sustainable development of municipal solid waste (MSW) landfills. An evaluation system of the stabilization process of MSW landfills has been established. The indices of the evaluation system involve the degradation degree of MSW, the release of landfill gas production potential, and the settlement of landfills. Based on the biochemical-consolidation-solute migration coupled model, an evaluation method of the MSW landfill stabilization process is proposed by combining field tests with numerical simulation. The stabilization process of the Jiangcungou landfill in China is investigated by using the proposed method. The analyzed results show that the stabilization process of high kitchen waste content landfills can be divided into three stages, which is different from the stabilization process of landfills in developed countries. For the Jiangcungou landfill, the ratio of cellulose to lignin in MSW decreases rapidly during the fast degradation stage when obvious settlement occurs. During the slow degradation stage, the hydrolysis rate is slow and settlement develops slowly. When the landfill reaches the stabilization stage, the ratio of cellulose to lignin of MSW changes very slowly; most of the landfill gas potential has been released; the settlement stabilization is completed basically. The change processes of the three evaluation indices are different, of which the degradation stabilization index is the main one. According to the findings above, leachate recirculation is recommended to adjust the degradation environment in the landfill, which can be helpful to avoid acidification at the fast degradation stage. Temporary cover is suggested to improve landfill gas collection efficiency at the beginning of the stable methanogenic stage. The landfill site closure should be operated when the settlement rate is low.

ACS Style

Hailong Liu; Xiang Luo; Xingyao Jiang; Chunyi Cui; Zhen Huyan. The Evaluation System of the Sustainable Development of Municipal Solid Waste Landfills and Its Application. Sustainability 2021, 13, 1150 .

AMA Style

Hailong Liu, Xiang Luo, Xingyao Jiang, Chunyi Cui, Zhen Huyan. The Evaluation System of the Sustainable Development of Municipal Solid Waste Landfills and Its Application. Sustainability. 2021; 13 (3):1150.

Chicago/Turabian Style

Hailong Liu; Xiang Luo; Xingyao Jiang; Chunyi Cui; Zhen Huyan. 2021. "The Evaluation System of the Sustainable Development of Municipal Solid Waste Landfills and Its Application." Sustainability 13, no. 3: 1150.

Conference paper
Published: 11 October 2018 in Soil and Recycling Management in the Anthropocene Era
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The increase of municipal solid waste (MSW) and the reduction of available urban land lead to the development of large-scale landfill. The landfill foundation is assumed to be rigid in existing models for calculating landfill compression. The self-weight of MSW increases with landfill expansion, and the landfill foundation settlement should not be ignored anymore. The estimation of landfill foundation settlement is of great importance in predicting landfill storage capacity and for the design of effective long-term landfill facilities. The implemented model for calculating landfill compression displacement and storage capacity is able to consider increase in foundation settlement induced by landfilling process. A calculation program is developed base on this proposed model, which can estimate landfill storage capacity. The quantitative effects of initial compaction on MSW landfill settlement and storage capacity are investigated by using the program via consideration of a hypothetical case. According to the investigation, a significant increase in storage capacity can be achieved by rational use of landfill foundation compression and intensive initial compaction. The quantitative investigation presented aims to encourage landfill operators to improve management to enhance storage capacity. Furthermore, prediction of landfill foundation settlement is helpful to protect leachate and gas management infrastructure at bottom of modern landfills.

ACS Style

Hailong Liu; Zhuo-Fei Wu; Yu-Chao Li. Landfill Storage Capacity Analysis Method by Considering Foundation Settlement and Its Application. Soil and Recycling Management in the Anthropocene Era 2018, 154 -161.

AMA Style

Hailong Liu, Zhuo-Fei Wu, Yu-Chao Li. Landfill Storage Capacity Analysis Method by Considering Foundation Settlement and Its Application. Soil and Recycling Management in the Anthropocene Era. 2018; ():154-161.

Chicago/Turabian Style

Hailong Liu; Zhuo-Fei Wu; Yu-Chao Li. 2018. "Landfill Storage Capacity Analysis Method by Considering Foundation Settlement and Its Application." Soil and Recycling Management in the Anthropocene Era , no. : 154-161.

Journal article
Published: 04 February 2013 in Waste Management & Research: The Journal for a Sustainable Circular Economy
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The quantitative effects of three operational factors, that is initial compaction, decomposition condition and leachate level, on municipal solid waste (MSW) landfill settlement and storage capacity are investigated in this article via consideration of a hypothetical case. The implemented model for calculating landfill compression displacement is able to consider decreases in compressibility induced by biological decomposition and load dependence of decomposition compression for the MSW. According to the investigation, a significant increase in storage capacity can be achieved by intensive initial compaction, adjustment of decomposition condition and lowering of leachate levels. The quantitative investigation presented aims to encourage landfill operators to improve management to enhance storage capacity. Furthermore, improving initial compaction and creating a preferential decomposition condition can also significantly reduce operational and post-closure settlements, respectively, which helps protect leachate and gas management infrastructure and monitoring equipment in modern landfills.

ACS Style

Yu-Chao Li; Hai-Long Liu; Peter Cleall; Han Ke; Xuecheng Bian. Influences of operational practices on municipal solid waste landfill storage capacity. Waste Management & Research: The Journal for a Sustainable Circular Economy 2013, 31, 273 -282.

AMA Style

Yu-Chao Li, Hai-Long Liu, Peter Cleall, Han Ke, Xuecheng Bian. Influences of operational practices on municipal solid waste landfill storage capacity. Waste Management & Research: The Journal for a Sustainable Circular Economy. 2013; 31 (3):273-282.

Chicago/Turabian Style

Yu-Chao Li; Hai-Long Liu; Peter Cleall; Han Ke; Xuecheng Bian. 2013. "Influences of operational practices on municipal solid waste landfill storage capacity." Waste Management & Research: The Journal for a Sustainable Circular Economy 31, no. 3: 273-282.