Modeling of leachate recirculation using vertical wells in bioreactor landfills

Feng, Shi‐Jin; Cao, Benyi; Zhang, Xu; Xie, Haijian

doi:10.1007/s11356-014-4045-7

Cited by 15 publications

(7 citation statements)

References 21 publications

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“…Slimani et al (2017) conducted a leachate injection test using a vertical well with the injection flowrate of 3.5m 3 h −1 , and analyzed the leachate level using a mathematical model. In addition, the numerical simulation and mathematical calculation Temperature monitoring during a waterinjection test using a vertical well in a newly filled MSW layer of a landfill for leachate recirculation using a vertical well in a landfill have been carried out in various studies (Feng et al, 2015(Feng et al, , 2016a(Feng et al, , 2017a(Feng et al, , 2017bJain et al, 2010Jain et al, , 2014bKhire and Mukherjee, 2007;Reddy et al, 2013Reddy et al, , 2015; the injection flowrate of 0-55m³ d −1 was used among these works. From this literature, it is evident that leachate recirculation and liquid injection using a vertical well have been researched widely.…”

Section: Introductionmentioning

confidence: 99%

Temperature monitoring during a water-injection test using a vertical well in a newly filled MSW layer of a landfill

et al. 2019

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High temperature may adversely affect municipal solid waste (MSW) biodegradation and lead to an increase in the deformation of high-density polyethylene (HDPE) pipes used for the collection of leachate and landfill gas in landfills. The test in this study was to change the waste temperature around the vertical injection well by water injection using a vertical well. The test was conducted intermittently with two different flowrates in a newly filled MSW layer of a landfill. The temperature, gas pressure and leachate level in the test area were simultaneously monitored during this study. The results showed that the waste temperature around the vertical injection well was effectively changed by water injection, which did not result in a significant rise in the leachate level. During water injection, the waste temperature influence distance in the horizontal direction increased with depth from the leachate level to the bottom of the injection well. The bottom temperature of the injection well decreased to near the water-injection temperature. The range of influence of the waste temperature caused by intermittent water injections slightly increased in this test. After water injection was stopped, the waste temperature near the vertical injection well increased quickly initially, and then the increments became more gradual with time. When the leachate level recovered stably, there was still a temperature gradient around the injection well within the range of influence. The temperature and gas pressure in the waste above the leachate level and far away from the injection well were slightly influenced by water injection.

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Section: Introductionmentioning

confidence: 99%

Temperature monitoring during a water-injection test using a vertical well in a newly filled MSW layer of a landfill

et al. 2019

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“…We assessed the void volume with the bioreactor according to bed expansion. Void volume has previously been expressed as the dead volume in which there is no available access to cells [ 27 , 28 ], and a high void volume has an obvious effect on the mass transport between cells and the perfused solution [ 29 ]. We found that bed expansion in the DMFBB was significantly less than that in the conventional FBB, indicating the void volume was less in the DMFBB.…”

Section: Discussionmentioning

confidence: 99%

A New Fluidized Bed Bioreactor Based on Diversion-Type Microcapsule Suspension for Bioartificial Liver Systems

Lü¹,

Zhang²,

Li³

et al. 2016

PLoS ONE

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A fluidized bed bioreactor containing encapsulated hepatocytes may be a valuable alternative to a hollow fiber bioreactor for achieving the improved mass transfer and scale-up potential necessary for clinical use. However, a conventional fluidized bed bioreactor (FBB) operating under high perfusion velocity is incapable of providing the desired performance due to the resulting damage to cell-containing microcapsules and large void volume. In this study, we developed a novel diversion-type microcapsule-suspension fluidized bed bioreactor (DMFBB). The void volume in the bioreactor and stability of alginate/chitosan microcapsules were investigated under different flow rates. Cell viability, synthesis and metabolism functions, and expression of metabolizing enzymes at transcriptional levels in an encapsulated hepatocyte line (C3A cells) were determined. The void volume was significantly less in the novel bioreactor than in the conventional FBB. In addition, the microcapsules were less damaged in the DMFBB during the fluidization process as reflected by the results for microcapsule retention rates, swelling, and breakage. Encapsulated C3A cells exhibited greater viability and CYP1A2 and CYP3A4 activity in the DMFBB than in the FBB, although the increases in albumin and urea synthesis were less prominent. The transcription levels of several CYP450-related genes and an albumin-related gene were dramatically greater in cells in the DMFBB than in those in the FBB. Taken together, our results suggest that the DMFBB is a promising alternative for the design of a bioartificial liver system based on a fluidized bed bioreactor with encapsulated hepatocytes for treating patients with acute hepatic failure or other severe liver diseases.

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“…No DP, anomalous behaviour at the transition phases, IC. Feng et al (2013Feng et al ( , 2014Feng et al ( , 2015Feng et al ( , 2016Feng et al ( 2017a Investigate the hydrodynamic and biochemical behavior within a bioreactor landfill subjected to leachate recirculation.…”

Section: Slimani Et Al (2016)mentioning

confidence: 99%

The case for examining fluid flow in municipal solid waste at the pore-scale – A review

2019

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23In this paper, we discuss recent efforts from the last 20 years to describe transport in municipal 24 solid waste (MSW). We first discuss emerging themes in the field to draw the reader's attention to 25 a series of significant challenges. We then examine contributions regarding the modelling of 26 leachate flow to study transport via mechanistic and stochastic approaches, at a variety of scales. 27Since MSW is a multiphase, biogeochemically active porous medium, and with the aim of 28 providing a picture of transport phenomena in a wider context, we then discuss a selection of 29 studies on leachate flow incorporating some of the complex landfill processes (e.g. biodegradation, 30 settlement). It is clear from the literature survey that our understanding of transport phenomena 31 exhibited by landfilled waste is far from complete. Attempts to model transport have largely 32 consisted of applying representative elementary-scale models (the smallest volume which can be 33 considered representative of the entire waste mass). Due to our limited understanding of fluid flow 34 through landfilled waste, and the influence of simultaneously occurring biogeomechanical 35 processes within the waste mass, elementary-scale models have been unable to fully describe the 36 flow behaviour of MSW. Pore-scale modelling and experimental studies have proven to be a 37 promising approach to study fluid flow through complex porous media. Here, we suggest that pore-38 scale modelling and experimental work may provide valuable insights into transport phenomena 39 exhibited by MSW, which could then be used to revise elementary-scale models for improved 40 representation of field-scale problems. 41 42 43 44 4 KEYWORDS 45 municipal solid waste; modelling leachate transport; landfill; waste heterogeneity; preferential 46 flow. 47 6 2000; Rosqvist et al. , 2005) with some studies focusing on conceptual models of the pore structure 89 of MSW at the elementary scale Woodman et al., , 2015 Woodman et al., 90 2013). However, to date, our understanding of the flow of leachate, biogas and the impact of other 91 simultaneously occurring biogeochemical processes on flow and transport is incomplete, 92 especially at the pore-scale. This is particularly important to note since it is these pore-scale 93 processes, with the possibility of field-scale processes dominating particular facets at particular 94 times, that ultimately govern the overall behaviour in reactive porous media (Blunt, 2001; Blunt 95 et al., 2013;Menke et al., 2017;Xiong, 2015;Xiong et al., 2016). It is likely that processes average 96 over a wide range of different scales, which would explain the success of the widely used empirical 97 landfill gas models. The real challenge lies in the integration of modelling processes at all the 98 scales and understanding how averaging works. It is clear that one of the most difficult aspects to 99 model is the inherent heterogeneity of the waste mass, and the impact of different waste 100 components (e.g. their shapes, sizes and varyi...

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Modeling of leachate recirculation using vertical wells in bioreactor landfills

Cited by 15 publications

References 21 publications

Temperature monitoring during a water-injection test using a vertical well in a newly filled MSW layer of a landfill

Temperature monitoring during a water-injection test using a vertical well in a newly filled MSW layer of a landfill

A New Fluidized Bed Bioreactor Based on Diversion-Type Microcapsule Suspension for Bioartificial Liver Systems

The case for examining fluid flow in municipal solid waste at the pore-scale – A review

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