The stability of dolomite in landfill leachate-collection systems

2000 ◽  
Vol 37 (2) ◽  
pp. 371-378 ◽  
Author(s):  
Peter J Bennett ◽  
Frederick J Longstaffe ◽  
R Kerry Rowe
Keyword(s):  
Thermodynamic Stability ◽  
Landfill Leachate ◽  
Pore Space ◽  
Collection System ◽  
Southern Ontario ◽  
Leachate Collection ◽  
The United Kingdom ◽  
Landfill Sites ◽  
The Stability ◽  
Simulated Landfill

This study uses several approaches to examine whether calcium-containing aggregate such as dolostone is a suitable drainage material for landfill leachate-collection systems. The thermodynamic stability of carbonate drainage materials has been assessed using published leachate data from landfills in the United Kingdom and leachate sampled from four large landfill sites of variable age in southern Ontario. Electron-microbeam techniques have been used to check for dissolution in dolomitic stone exhumed from the drainage layer of the Keele Valley Landfill leachate-collection system and from experiments that simulated landfill conditions. The mineralogy of cover soils applied daily to the landfill has been compared to the drainage stone and detrital material occluding pore space in the leachate-collection system to evaluate their relative contributions to clogging. The data suggest that dissolution of dolomitic drainage stone is not significant and contributes little to the clogging of landfill leachate-collection systems. However, crystallization of secondary calcite occurs about the dolomitic stones and sizeable quantities of inorganic fines, including dolomite, were present within some samples of "clog material" exhumed from the Keele Valley collection system. Most of the dolomitic fines probably were generated during construction of the collection system; such creation of fines ought to be minimized in future landfill developments.Key words: leachate-collection system, landfills, clogging, mineralogy, leachate chemistry.

Clogging of unsaturated gravel permeated with landfill leachate

2008 ◽  
Vol 45 (8) ◽  
pp. 1045-1063 ◽  
Author(s):  
Reagan McIsaac ◽  
R. Kerry Rowe
Keyword(s):  
Experimental Investigation ◽  
Landfill Leachate ◽  
Retention Time ◽  
Total Surface Area ◽  
Collection System ◽  
Waste Landfill ◽  
Leachate Collection ◽  
Flow Pathways ◽  
Inorganic Constituents ◽  
Drainable Porosity

The results of an experimental investigation into the clogging of unsaturated, uniformly graded 50 mm gravel permeated with municipal solid waste landfill leachate are reported. The flow of leachate within the unsaturated gravel was heterogeneous and occurred in free-draining flow pathways. The leachate experienced reductions in the concentrations of both the organic and inorganic constituents after passing through the unsaturated gravel although there was very little clogging within the unsaturated gravel. The average drainable porosity was reduced by 8% after 8 years permeation. The biofilm was limited to areas on the gravel where leachate could be retained; predominantly on top of lateral gravel surfaces and near particle-to-particle contacts. As a result, only a small fraction of the total surface area of the unsaturated gravel was covered with biofilm. The short leachate retention time and the sporadic distribution of biofilm limited the degree of contact between the bacteria and the leachate and hence limited biologically induced clogging within the unsaturated gravel. The data suggest that leachate collection systems should be designed and operated such that the drainage material of the leachate collection system remains unsaturated for as long as possible.

scholarly journals Odorants and Their Contributions to Overall Odour Emission from a Landfill Leachate

2019 ◽  
Author(s):  
Xinguang Wang ◽  
Gavin Parcsi ◽  
Eric Sivret ◽  
Minh Le ◽  
Richard Stuetz
Keyword(s):  
Gas Chromatography ◽  
Gas Phase ◽  
Landfill Leachate ◽  
Measurement Techniques ◽  
Leachate Collection ◽  
Alpha Pinene ◽  
Odour Source ◽  
Landfill Sites ◽  
Odour Emissions ◽  
Sydney Australia

As one of the important odour sources, landfill sites have drawn more and more public attentions. Odour emissions from landfill sites depend on the waste buried, operation activities, running conditions, etc. A study for finding out all possible odorous compounds from a landfill was conducted by analysing of on-site gas phase samples and emission samples from a landfill leachate in Sydney, Australia using thermal desorber – gas chromatography – mass spectrometer (TD-GC-MS) and air server – thermal desorber – gas chromatography – sulfur chemiluminoscence detector (AS-TD-GC-SCD). 49 odorants were identified from emission gas samples collected from landfill leachate collection pipe and only 8 odorants were detected from flux hood emission samples of the collected leachate sample. This indicates that more sampling and measurement techniques are always better to acquire all possible pollutants from an unknown odour source. The contributions of these odorants to overall odour emissions were also calculated based on their concentrations and odour thresholds. The top 10 odorants from leachate transportation pipe include methyl mercaptan, ethyl mercaptan, m-xylene, H2S, CS2, 1,2,3,4-tetra-methylbenzene, p-xylene, 1,2,4-trimethylbenzene, ethylbenzene and α-pinene. They contributed more than 95% to the odour in the gas accumulated in the leachate collection pipe.

Unusual calcite stromatolites and pisoids from a landfill leachate collection system

Geology ◽  
2000 ◽  
Vol 28 (10) ◽  
pp. 931-934 ◽  
Author(s):  
Robert G. Maliva ◽  
Thomas M. Missimer ◽  
Kevin C. Leo ◽  
Richard A. Statom ◽  
Christophe Dupraz ◽  
...  
Keyword(s):  
Landfill Leachate ◽  
Collection System ◽  
Leachate Collection

Unusual calcite stromatolites and pisoids from a landfill leachate collection system

Geology ◽  
2000 ◽  
Vol 28 (10) ◽  
pp. 931 ◽  
Author(s):  
Robert G. Maliva ◽  
Thomas M. Missimer ◽  
Kevin C. Leo ◽  
Richard A. Statom ◽  
Christophe Dupraz ◽  
...  
Keyword(s):  
Landfill Leachate ◽  
Collection System ◽  
Leachate Collection

Field observations of clogging in a landfill leachate collection system

1999 ◽  
Vol 36 (4) ◽  
pp. 685-707 ◽  
Author(s):  
I R Fleming ◽  
R K Rowe ◽  
D R Cullimore
Keyword(s):  
Landfill Leachate ◽  
Hydraulic Properties ◽  
Dolomitic Limestone ◽  
Collection System ◽  
Anaerobic Conditions ◽  
Similar Material ◽  
Waste Landfill ◽  
Municipal Landfill ◽  
Leachate Collection ◽  
Rare Opportunity

The findings from a rare opportunity to exhume, examine, and sample a granular underdrain leachate collection system at a large municipal landfill site are reported. The "clear stone" drainage blanket was constructed from uniform, coarse gravel (with a nominal 50 mm particle size) obtained by crushing dolomitic limestone. After exposure to municipal landfill leachate for 1-4 years, the drainage stone was found to contain a considerable mass and volume of clog and slime materials. These were composed of mineral precipitates, fine granular particulate, and biofilm, growing under the ambient anaerobic conditions prevalent below the landfilled waste. The spatial distribution, physical and hydraulic properties, and chemical and microbiological composition of this material were examined and compared with similar material recovered from a laboratory mesocosm. The findings suggest a theoretical framework for a model of clogging behaviour of leachate collection drains at municipal solid waste landfill sites.Key words: municipal waste, leachate, clogging, drainage, biofilm, cementation.

scholarly journals Scale Deposition Inhibiting Composites by HDPE/Silicified Acrylate Polymer/Nano-Silica for Landfill Leachate Piping

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3497
Author(s):  
Min Li ◽  
Rui Zhao ◽  
Sude Ma ◽  
Tianxue Yang
Keyword(s):  
Landfill Leachate ◽  
Immersion Test ◽  
Pipe Material ◽  
Excellent Thermal Stability ◽  
Leachate Collection ◽  
Low Surface Energy ◽  
Prepared Composite ◽  
Design And Manufacture ◽  
Simulated Landfill ◽  
Acrylate Polymer

Scaling commonly occurs at pipe wall during landfill leachate collection and transportation, which may give rise to pipe rupture, thus posing harm to public health and environment. To prevent scaling, this study prepared a low surface energy nanocomposite by incorporating silicone-acrylate polymer and hydrophobically modified nano-SiO2 into the high-density polyethylene (HDPE) substrate. Through the characterization of contact angle, scanning electron microscopy and thermogravimetry, the results showed that the prepared composite has low wettability and surface free energy, excellent thermal stability and acid-base resistance. In addition, the prepared composite was compared with the commercial HDPE pipe material regarding their performance on anti-scaling by using an immersion test that places their samples into a simulated landfill leachate. It was apparent that the prepared composite shows better scaling resistance. The study further expects to provide insight into pipe materials design and manufacture, thus to improve landfill leachate collection and transportation.

Influence Factors in Clogging of Landfill Leachate Collection System

2014 ◽  
Vol 878 ◽  
pp. 631-637 ◽  
Author(s):  
Xiao Lin Bian ◽  
Jian Guo Liu
Keyword(s):  
Particle Size ◽  
Landfill Leachate ◽  
Granular Media ◽  
Influence Factors ◽  
Dry Mass ◽  
Mass Loading ◽  
Collection System ◽  
Inorganic Particles ◽  
Leachate Collection ◽  
Main Component

A common failure mode for landfills is clogging of the leachate collection system. Based on the studies of clogging about landfill leachate collection system, the influence factors about clog were comprehensively and systematically analyzed .The results show that calcium is the dominant mineral of the dry mass of clog material, and CaCO3 is the main component of the clog. The growth of biomass, minerals precipitation and deposition of suspend inorganic particles are the three major mechanisms for the clogging of LCSs. However, the clogging rate and extend of LCSs is affected by particle size of the granular media, pipe spacing and pipe diameter, filter-separator layer, mass loading, saturated or unsaturated conditions and temperature. These conclusions have profound guiding significance for the design and operation of landfill leachate collection system.

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