Field observations of clogging in a landfill leachate collection system

The potential of enhanced weathering in the UK

“…Approximately 4.1 Gt of C and D waste may have been produced since the early 1950s (Renforth et al, 2011), the majority of which since the Environment Act, has been disposed of in landfill. Chemical analysis of landfill leachate suggests that this material has, at least, partially carbonated and sequestered CO 2 as carbonate minerals (Fleming et al, 1999;Manning, 2001). Similarly, analysis of soils in brownfield sites that have been mixed with demolition waste also show substantial carbonate formation (Renforth et al, 2009).…”

Precipitates in landfill leachate mediated by dissolved organic matters

“…An alternative approach to such modeling is to consider the most prominent and abundant types of these organics while omitting the effects of the negligible in terms of concentration and binding capacity. These efforts are exemplified by the experimental design of Rowe et al [2,3,6], in which the COD, BOD and concentration of small molecule organics are frequently tested. In a recent study [20], we proposed to model the precipitation behavior of calcium in landfill leachate by assuming that humic acids are representative of the composition of DOC in landfill leachate.…”

Fines migration from soil daily covers in Hong Kong landfills

“…Soils are the traditional materials for MSW landfill daily covers, but their use is controversial, particularly in consumption of valuable landfill space (Aivaliotis et al, 1995(Aivaliotis et al, , 2004Greedy, 1995;Haughey, 2001;Panagiotakopoulos and Dokas, 2001), contribution to waste mass instability and hydraulic heterogeneity (Hancook et al, 1999;Jang, 2000;Dixon and Jones, 2005), and reduction in drainage efficiency in the drainage layer due to fines migration and clog formation (Wiles and Hare, 1997;Fleming et al, 1999;Manning and Robinson, 1999;Bennett et al, 2000). In this paper, fines migration from typical Hong Kong soil daily covers by means of water permeation was investigated and quantified using column experiments.…”

“…In the last decade, LCS clogging was investigated extensively using field and laboratory column studies due to its practical significance (Fleming et al, 1999;Bennett et al, 2000;Rowe et al, 2000aRowe et al, ,b, 2002Cooke et al, 2001;Bouchez et al, 2003;Fleming and Rowe, 2004;VanGulck and Rowe, 2004a,b). In a previous field study conducted by Fleming et al (1999), a 4-year-old landfill drainage blanket was exhumed and a considerable amount of void space was found occupied by the clog materials. The clog samples collected contained a significant amount of fine inorganic particles that were not present in the original gravel drainage layer.…”

“…Compositional analyses of the clog material collected from landfills in Germany and Canada have confirmed that silica is one of the key constituents, representing about 16-21% of the clog by mass (Brune et al, 1991;Fleming et al, 1999). Despite many valuable works reported in literature on clog formation, the possible contribution of soil daily covers to LCS clogging has not been addressed adequately.…”