{"id":114,"date":"2026-10-02T10:05:55","date_gmt":"2026-10-02T10:05:55","guid":{"rendered":"https:\/\/leachate.co.uk\/main\/?p=114"},"modified":"2026-10-02T23:24:12","modified_gmt":"2026-10-02T23:24:12","slug":"landfill-leachate-extraction","status":"publish","type":"post","link":"https:\/\/leachate.co.uk\/main\/leachate-extraction\/landfill-leachate-extraction\/","title":{"rendered":"Landfill Leachate Collection and Extraction"},"content":{"rendered":"<div class=\"soc_custom_post_ad soc_none\"><p><a title=\"Sewage design guide banner\" href=\"https:\/\/leachate.co.uk\/main\/product\/the-sewage-waste-treatment-design-guide\/\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/leachate.co.uk\/main\/wp-content\/uploads\/2022\/01\/Sewage-Treatment-pdf-banner-800x30-1.webp\" alt=\"Sewage Treatment pdf banner\" width=\"800\" height=\"130\" \/><\/a><\/p><\/div><p>The subject of <strong>landfill leachate collection and extraction<\/strong> embraces:<\/p>\n<ul>\n<li>the wells, sumps and boreholes within the landfill into which the leachate collection system conveys the leachate;<\/li>\n<li>the pump systems which extract the leachate from the wastes;<\/li>\n<li>the systems which deliver the motive force to the pumps;<\/li>\n<li>the pipes and pipelines which convey the leachate to a collection tank, sewer discharge point or leachate treatment plant;<\/li>\n<li>the monitoring and control systems; and<\/li>\n<li>increasingly, telemetry and automated controls used to demonstrate that permitted leachate levels are being maintained.<\/li>\n<\/ul>\n<p>These components together form one of the most important pieces of environmental protection infrastructure at a modern landfill.<\/p>\n<p>The purpose is not simply to pump out the leachate. <strong>A properly designed leachate collection and extraction system must maintain leachate levels within the limits established for the site, continue to operate despite waste settlement and ageing infrastructure, and remain accessible for inspection, maintenance and eventual replacement.<\/strong><\/p>\n<p>Given the breadth of skills required to successfully achieve the extraction of landfill leachate, it is not surprising that specialist leachate extraction contractors developed alongside the emergence of the fully engineered landfill.<\/p>\n<p>Existing technologies and products from closely allied fields have been refined over many years, and new products, instrumentation and monitoring techniques continue to be developed. There is now a recognised range of technologies available, but <strong>the correct landfill leachate extraction system remains highly site-specific<\/strong>.<\/p>\n<p>The depth of the landfill, waste settlement, leachate flow, suspended solids, scaling potential, landfill gas production, pumping head, accessibility and configuration of the basal drainage system all influence the most appropriate design.<\/p>\n<h2>Why Landfill Leachate Level Control Matters<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-115 size-thumbnail\" style=\"margin-left: 20px; margin-right: 20px;\" title=\"pcc-leachate-chamber\" src=\"https:\/\/leachate.co.uk\/main\/wp-content\/uploads\/2011\/01\/pcc-leachate-chamber-150x150.jpg\" alt=\"Leachate extraction\" width=\"150\" height=\"150\" \/>For contained hazardous and non-hazardous landfills, leachate must normally be actively managed. In England, the Environment Agency requires operators to extract and dispose of the leachate produced by the site and to maintain leachate levels within site-specific compliance limits established through the environmental permit.<\/p>\n<p>The leachate drainage system collects liquid reaching the base of the landfill and conveys it towards extraction points. Pumps, or where appropriate gravity drainage, then remove it so that the required leachate head can be maintained.<\/p>\n<p>Excessive leachate levels may:<\/p>\n<ul>\n<li>increase the hydraulic head acting across the landfill containment system;<\/li>\n<li>increase the potential for leachate migration;<\/li>\n<li>contribute to lateral seepages or outbreaks;<\/li>\n<li>interfere with landfill gas extraction;<\/li>\n<li>increase odour risks;<\/li>\n<li>contribute to elevated pore-water pressures and stability problems; and<\/li>\n<li>cause a site to exceed the leachate level limits specified in its environmental permit.<\/li>\n<\/ul>\n<p>It follows that <strong>leachate collection, extraction, monitoring and landfill gas control should not be regarded as completely separate systems<\/strong>. They interact throughout the operational and aftercare life of a landfill.<\/p>\n<p>A landfill gas extraction well flooded by elevated leachate cannot extract gas efficiently. Conversely, inadequately sealed leachate extraction infrastructure may provide a route for air to enter a landfill when the gas extraction system is operating under suction.<\/p>\n<p>The Environment Agency&#8217;s current guidance on the subject can be found in <a href=\"https:\/\/www.gov.uk\/guidance\/landfill-operators-environmental-permits\/manage-leachate\" target=\"_blank\" rel=\"noopener\">Landfill operators: manage leachate<\/a>.<\/p>\n<h2>Leachate Extraction Systems Under Difficult Conditions<\/h2>\n<p>Leachate extraction equipment is often really put to the test when landfill leachate levels have already risen and must be drawn down.<\/p>\n<p>Such was the case in 2002 when the Arpley Landfill was drawn down using pneumatic extraction pumping systems.<\/p>\n<p>The work was described in a paper by Howard Robinson presented at the CIWM Annual Waste Management Exhibition and Conference at Torbay in June 2003. The project demonstrated how a landfill experiencing difficulties with its leachate regime could be transformed through improved collection and extraction to achieve much better leachate level control.<\/p>\n<p>Although that example is now historic, the engineering lesson remains relevant.<\/p>\n<p><strong>When landfill leachate levels have risen substantially, simply installing more pumps is not necessarily the complete answer.<\/strong><\/p>\n<p>The engineer needs to establish why the leachate is not reaching the extraction points quickly enough and whether the drainage system, extraction wells, pumps, rising mains and control system together have sufficient capacity.<\/p>\n<p>Possible causes of poor performance include:<\/p>\n<ul>\n<li>clogging of drainage media or collection pipework;<\/li>\n<li>damaged or distorted extraction wells;<\/li>\n<li>mineral or biological scaling;<\/li>\n<li>unsuitable or undersized pumps;<\/li>\n<li>excessive landfill settlement;<\/li>\n<li>inadequate pumping capacity;<\/li>\n<li>failure of transfer pipework; or<\/li>\n<li>insufficient extraction points.<\/li>\n<\/ul>\n<h2>Leachate Extraction Wells and Boreholes<\/h2>\n<p>The types of wells regularly utilised in landfill leachate extraction systems can be characterised broadly as follows, listed in approximately the order in which they became established in UK landfill practice.<\/p>\n<figure id=\"attachment_1200\" aria-describedby=\"caption-attachment-1200\" style=\"width: 1076px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1200 size-full\" title=\"Active landfill cell filling with concrete manhole leachate extraction tower in foreground.\" src=\"https:\/\/leachate.co.uk\/main\/wp-content\/uploads\/2011\/01\/Active-landfill-cell-filling-with-concrete-manhole-leachate-extraction-tower-in-foreground.webp\" alt=\"Active landfill cell filling with concrete manhole leachate extraction tower in foreground.\" width=\"1076\" height=\"606\" srcset=\"https:\/\/leachate.co.uk\/main\/wp-content\/uploads\/2011\/01\/Active-landfill-cell-filling-with-concrete-manhole-leachate-extraction-tower-in-foreground.webp 1076w, https:\/\/leachate.co.uk\/main\/wp-content\/uploads\/2011\/01\/Active-landfill-cell-filling-with-concrete-manhole-leachate-extraction-tower-in-foreground-300x169.webp 300w, https:\/\/leachate.co.uk\/main\/wp-content\/uploads\/2011\/01\/Active-landfill-cell-filling-with-concrete-manhole-leachate-extraction-tower-in-foreground-1024x577.webp 1024w, https:\/\/leachate.co.uk\/main\/wp-content\/uploads\/2011\/01\/Active-landfill-cell-filling-with-concrete-manhole-leachate-extraction-tower-in-foreground-768x433.webp 768w\" sizes=\"auto, (max-width: 1076px) 100vw, 1076px\" \/><figcaption id=\"caption-attachment-1200\" class=\"wp-caption-text\">Active landfill cell filling with concrete manhole leachate extraction &#8220;tower&#8221; in foreground.<\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<h3>Large Engineered Leachate Towers<\/h3>\n<p>At some very deep landfill sites, massive engineering structures were constructed in the form of rigid towers extending from the base of the landfill towards the restored surface.<\/p>\n<p>These were particularly associated with the infilling of deep, vertical-sided quarries during the late 1980s and early 1990s, where continuous drainage by pumping was essential.<\/p>\n<p>A classic example is <strong>Enderby Warren Quarry Landfill in Leicestershire<\/strong>, which is approximately 80 metres deep and historically required substantial leachate pumping capacity.<\/p>\n<p>Such structures illustrate the fundamental problem faced by the landfill designer: equipment installed at the bottom of the landfill may need to remain operational and accessible when tens of metres of waste have subsequently been deposited around and above it.<\/p>\n<h3>Precast Concrete Leachate Chambers<\/h3>\n<p>For many years, one of the most commonly used methods was the <strong>precast concrete chamber-ring leachate well<\/strong>, generally ranging from about 600 mm to 1.8 m diameter and occasionally larger.<\/p>\n<p>The chamber was progressively raised as successive lifts of waste were deposited. Electric submersible pumps were commonly installed inside the chamber.<\/p>\n<p>Many examples remain in service.<\/p>\n<p>Their great advantage is their substantial internal diameter, which provides good access for pumps and maintenance. Their disadvantage is that landfill waste does not behave like conventional foundation material.<\/p>\n<p><strong>Settlement, lateral movement and differential loading can place substantial stresses on rigid structures extending through a waste mass.<\/strong><\/p>\n<p>For this reason, modern landfill design gives much more attention to the ability of extraction structures to withstand settlement and deformation throughout the site&#8217;s life.<\/p>\n<h3>Retrofitted Leachate Boreholes<\/h3>\n<p>Where an existing landfill develops inadequate leachate level control, it may be necessary to retrofit additional extraction points.<\/p>\n<p>One method is to install <strong>percussion-driven or drilled boreholes into the waste mass<\/strong>.<\/p>\n<p>These may be cased and surrounded, where appropriate, with drainage stone or other drainage media before an extraction pump is installed.<\/p>\n<p>Retrofitted boreholes can be extremely useful, particularly where an original extraction point has failed or where monitoring shows that leachate is accumulating in part of the waste mass.<\/p>\n<p>However, drilling into a completed landfill requires considerable care.<\/p>\n<p>The location of the basal and sidewall lining systems must be known, and drilling depths must be controlled so that the landfill containment system is not damaged.<\/p>\n<p>Modern Environment Agency guidance now requires provision for possible future failure by installing a suitable <strong>target pad<\/strong> close to leachate extraction and monitoring points so that replacement infrastructure can subsequently be drilled if necessary.<\/p>\n<h3>HDPE Leachate Extraction Wells<\/h3>\n<p>Proprietary <strong>HDPE leachate well systems<\/strong>, many based on designs initially developed in continental Europe, have now been used on UK landfills for decades.<\/p>\n<p>These systems can be progressively raised with the waste in much the same manner as traditional precast concrete wells.<\/p>\n<p>Their principal advantages include corrosion resistance and greater flexibility than rigid concrete structures.<\/p>\n<p>HDPE is resistant to many of the aggressive chemical conditions associated with landfill leachate and, if the system is properly designed, can accommodate a degree of landfill movement.<\/p>\n<p>However, flexibility does not eliminate the settlement problem.<\/p>\n<p>Vertical wells can still experience bending, lateral displacement, shear and buckling. Their position relative to waste placement and the way successive extensions are installed can have a major influence on their ultimate serviceability.<\/p>\n<p><strong>Well alignment and protection during filling are therefore just as important as the material from which the well is manufactured.<\/strong><\/p>\n<h2>Side-Slope or Upslope Leachate Risers<\/h2>\n<p>Upslope or side-slope risers are extraction pipes laid at an inclined angle to the battered side slopes of landfills.<\/p>\n<p>Such slopes are common features of modern landfill cells and are particularly important in steep-sided quarries, where the landfill lining system must extend up the sides of the excavation.<\/p>\n<p>Side-slope risers can provide useful access to the basal leachate drainage system without requiring a large vertical structure to extend upwards through the entire waste mass.<\/p>\n<p>There is also the possibility of providing access into the basal leachate collection pipework for inspection, CCTV surveying or jet cleaning.<\/p>\n<p>It was once sometimes assumed that side-slope risers would necessarily suffer less settlement damage than vertical wells. <strong>Experience has shown that this should not be taken for granted.<\/strong><\/p>\n<p>A side-slope riser must remain at a suitable continuous gradient and must accommodate movements of the waste and adjacent engineered slopes. Distortion, settlement or poorly designed changes in gradient can make pump removal, CCTV access and jetting difficult or impossible.<\/p>\n<p>The effect of the riser on the adjacent liner system must also be considered.<\/p>\n<p>The lesson is that neither vertical wells nor side-slope risers should be regarded as maintenance-free. <strong>The successful system is one designed from the outset for inspection, cleaning, pump replacement, settlement and eventual failure.<\/strong><\/p>\n<h2>Modern Landfill Leachate Extraction Well Design<\/h2>\n<p>Current UK landfill engineering requirements illustrate how far extraction-well design has progressed from simply placing a pump inside a chamber.<\/p>\n<p>Among the matters which now need to be considered are:<\/p>\n<ul>\n<li>adequate internal diameter to provide long-term access;<\/li>\n<li>sufficient structural strength to resist deformation and buckling;<\/li>\n<li>accommodation of waste settlement and well deflection;<\/li>\n<li>provision for temporary or permanent pumps;<\/li>\n<li>access for CCTV inspection and jetting of drainage pipework;<\/li>\n<li>gas-tight and secure well covers;<\/li>\n<li>sealing of the upper part of the structure against uncontrolled landfill gas emission and air ingress;<\/li>\n<li>suitable facilities for monitoring leachate levels;<\/li>\n<li>safe access for inspection and maintenance;<\/li>\n<li>protection of the underlying landfill liner; and<\/li>\n<li>the possibility that the extraction point may ultimately have to be replaced.<\/li>\n<\/ul>\n<p>For new landfill installations in England, current Environment Agency guidance specifies that leachate extraction wells should have an <strong>internal diameter of at least 600 mm<\/strong>. This provides space for secondary pipework or re-drilling within the existing well if failure occurs.<\/p>\n<p>The Environment Agency also requires wells to be capable of accommodating landfill settlement, to provide access for CCTV and jetting, and to avoid damaging the underlying liner.<\/p>\n<p>See the current <a href=\"https:\/\/www.gov.uk\/guidance\/landfill-operators-environmental-permits\/design-and-build-your-landfill-site\" target=\"_blank\" rel=\"noopener\">Environment Agency landfill design and construction guidance<\/a> for the detailed requirements.<\/p>\n<p>This highlights an important point for landfill designers and operators:<\/p>\n<p><strong>Leachate extraction infrastructure has to be designed for the life of the landfill, not simply for the period during which waste is being deposited.<\/strong><\/p>\n<p>For many sites, the aftercare period during which leachate continues to require management will be considerably longer than the active filling period.<\/p>\n<h2>Landfill Leachate Pumps<\/h2>\n<p>Both <strong>electric submersible pumps and pneumatic pumps<\/strong> have long been used for landfill leachate extraction.<\/p>\n<p>Neither should automatically be regarded as the best choice for every site.<\/p>\n<p>Electric pumps can provide relatively high flow rates and good pumping efficiency, but the equipment, electrical installation and controls must be suitable for the environment in which they operate.<\/p>\n<p>Pneumatic pumps can be useful in narrow extraction wells and applications where variable or intermittent flows occur. However, they require a reliable compressed-air supply and may suffer problems associated with solids, blockage, scale and maintenance if poorly matched to the duty.<\/p>\n<p>Pump selection therefore depends on factors including flow rate, pumping head, extraction-well diameter, leachate chemistry, solids loading, scaling potential, power availability and ease of maintenance.<\/p>\n<p>One practical consideration deserves particular attention:<\/p>\n<p><strong>Can the pump still be removed and replaced after years of landfill settlement?<\/strong><\/p>\n<p>A theoretically efficient pump is of little value if distortion of the extraction well prevents it from being recovered.<\/p>\n<p>For a more detailed discussion of pump types, pneumatic versus electric systems and pump selection, see our dedicated guide: <a href=\"https:\/\/leachate.co.uk\/main\/leachate-extraction\/leachate-pumps-leachate-pumping-systems\/\"><strong>Leachate Pumps \u2013 Leachate Pumping Systems<\/strong><\/a>.<\/p>\n<h2>Leachate Transfer Pipework<\/h2>\n<p>After extraction, the leachate normally has to be transferred to a storage tank, tanker loading point, sewer discharge connection or on-site leachate treatment plant.<\/p>\n<p>Transfer pipework therefore forms an essential part of the extraction system.<\/p>\n<p>The system should be designed to deal with the anticipated leachate flows and pumping pressures while allowing for inspection, isolation and maintenance.<\/p>\n<p>Pipe materials must be compatible with the expected leachate and suitable for the intended service life.<\/p>\n<p>Settlement remains important here as well. Connections between relatively rigid structures and pipework located within or above settling waste can be particularly vulnerable.<\/p>\n<p>Current Environment Agency guidance states that permanent buried pipework should be installed as soon as reasonably practicable to carry leachate from extraction points to the treatment or disposal facility.<\/p>\n<h2>Monitoring, Control and Telemetry<\/h2>\n<p>One of the biggest changes since many older landfill extraction systems were installed has been the development and falling cost of remote monitoring and control.<\/p>\n<p>At its simplest, monitoring determines whether the pump is operating and whether the landfill leachate level is within the required limit.<\/p>\n<p>More sophisticated systems may monitor:<\/p>\n<ul>\n<li>leachate level;<\/li>\n<li>pump operating hours;<\/li>\n<li>pump starts;<\/li>\n<li>extracted volumes or flow rates;<\/li>\n<li>high-level alarms;<\/li>\n<li>pump failure;<\/li>\n<li>compressed-air pressure for pneumatic installations;<\/li>\n<li>storage tank levels; and<\/li>\n<li>communications or power failure.<\/li>\n<\/ul>\n<p>Data can increasingly be transmitted remotely to site management systems, allowing abnormal trends to be recognised before an environmental permit limit is breached.<\/p>\n<p>However, telemetry is not a substitute for properly located monitoring points.<\/p>\n<p><strong>The leachate level adjacent to a working extraction pump may not represent the leachate level across the whole landfill cell.<\/strong><\/p>\n<p>Current Environment Agency guidance therefore requires leachate-level monitoring away from the extraction system. For each cell or hydraulically separated area, monitoring should demonstrate the leachate level across the wider catchment rather than merely beside the pump.<\/p>\n<p>See the Environment Agency guidance on <a href=\"https:\/\/www.gov.uk\/guidance\/landfill-operators-environmental-permits\/monitor-and-report-your-performance\" target=\"_blank\" rel=\"noopener\">monitoring and reporting landfill performance<\/a>.<\/p>\n<h2>Leachate Extraction and Environmental Permit Compliance<\/h2>\n<p>For regulated landfill sites, the performance of the extraction system has a direct relationship with environmental permit compliance.<\/p>\n<p>A leachate management plan should provide adequate extraction capacity to maintain the required levels and should establish action levels below the final compliance limit.<\/p>\n<p>This is good engineering as well as good environmental management.<\/p>\n<p><strong>Waiting until the permitted maximum leachate level has actually been exceeded before taking action provides too little margin for equipment failure, unusually wet weather or declining drainage performance.<\/strong><\/p>\n<p>The extraction system must also interact satisfactorily with the site&#8217;s landfill gas management system, drainage infrastructure and containment system.<\/p>\n<p>High leachate levels can flood landfill gas wells, while poorly sealed leachate wells can provide routes for gas escape or air ingress.<\/p>\n<h2>How Much Does a Leachate Collection and Extraction System Cost?<\/h2>\n<p>There is no meaningful single price for a landfill leachate collection and extraction system.<\/p>\n<p>Costs depend heavily upon site area, landfill depth, pipe diameter and SDR, drainage-layer configuration, the number and depth of sumps or extraction wells, pumping head, electrical or pneumatic infrastructure, instrumentation and the degree of integration required with the landfill liner.<\/p>\n<p>For this reason, costs should normally be developed from a site-specific design and bill or schedule of quantities rather than relying upon headline unit rates.<\/p>\n<p>We have covered the subject separately in our more detailed article: <a href=\"https:\/\/leachate.co.uk\/main\/leachate-general\/leachate-collection-system-pricing\/\"><strong>Leachate Collection System Pricing: HDPE Pipe, Pumps and Design Costs Explained<\/strong><\/a>.<\/p>\n<p>Keeping the detailed costing discussion there also allows this page to remain focused on the engineering principles of <strong>landfill leachate extraction and level control<\/strong>.<\/p>\n<h2>Designing for Failure, Not Just Normal Operation<\/h2>\n<p>Perhaps one of the biggest changes in landfill engineering thinking since the early generations of engineered sites is the recognition that <strong>individual components of landfill infrastructure will eventually fail<\/strong>.<\/p>\n<ul>\n<li>Pumps fail.<\/li>\n<li>Pipework scales and blocks.<\/li>\n<li>Wells distort.<\/li>\n<li>Connections separate.<\/li>\n<li>Drainage systems may gradually lose hydraulic performance.<\/li>\n<li>Instrumentation fails.<\/li>\n<li>Waste continues to settle for many years.<\/li>\n<\/ul>\n<p>A robust leachate extraction system is therefore not one designed on the assumption that none of these things will happen.<\/p>\n<p>It is one designed so that <strong>when they do happen they can be detected, accessed, maintained and, where necessary, replaced without losing control of the landfill leachate regime.<\/strong><\/p>\n<p>For new landfills this principle should influence the layout from the beginning.<\/p>\n<p>For older landfill sites it is often the starting point for investigating persistent high leachate levels.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1198 size-full\" title=\"Landfill leachate collection and extraction article featured image.\" src=\"https:\/\/leachate.co.uk\/main\/wp-content\/uploads\/2011\/01\/landfill-leachate-collection-and-extraction-article-featured-image.webp\" alt=\"Landfill leachate collection and extraction article featured image.\" width=\"1280\" height=\"720\" srcset=\"https:\/\/leachate.co.uk\/main\/wp-content\/uploads\/2011\/01\/landfill-leachate-collection-and-extraction-article-featured-image.webp 1280w, https:\/\/leachate.co.uk\/main\/wp-content\/uploads\/2011\/01\/landfill-leachate-collection-and-extraction-article-featured-image-300x169.webp 300w, https:\/\/leachate.co.uk\/main\/wp-content\/uploads\/2011\/01\/landfill-leachate-collection-and-extraction-article-featured-image-1024x576.webp 1024w, https:\/\/leachate.co.uk\/main\/wp-content\/uploads\/2011\/01\/landfill-leachate-collection-and-extraction-article-featured-image-768x432.webp 768w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<h2>Frequently Asked Questions About Landfill Leachate Extraction<\/h2>\n<h3>What is landfill leachate extraction?<\/h3>\n<p>Landfill leachate extraction is the removal of contaminated liquid from the landfill&#8217;s drainage and collection system using pumps, gravity drainage or a combination of both. Its principal purpose is to maintain leachate levels within the limits required by the landfill design and environmental permit.<\/p>\n<h3>Why must leachate levels be kept low in a landfill?<\/h3>\n<p>Controlling leachate levels limits the hydraulic head acting on the landfill lining system and reduces the risk of leakage, lateral seepage, odour and interference with landfill gas extraction. Excessive levels may also contribute to stability problems.<\/p>\n<h3>What types of leachate extraction wells are used?<\/h3>\n<p>Common arrangements include vertical extraction wells, large-diameter chambers, side-slope or upslope risers, retro-drilled boreholes and, at suitable sites, gravity drainage systems.<\/p>\n<h3>What size should a landfill leachate extraction well be?<\/h3>\n<p>For new installations in England, current Environment Agency guidance specifies a minimum internal diameter of 600 mm for leachate extraction wells. The well must also provide suitable pump, monitoring, CCTV and jetting access and accommodate landfill settlement.<\/p>\n<h3>Are pneumatic or electric leachate pumps better?<\/h3>\n<p>Neither pump type is universally better. Electric submersible pumps generally offer greater pumping capacity and efficiency, whereas pneumatic pumps can be advantageous in some restricted or intermittent pumping applications. Selection should be based on the required duty, well configuration, leachate characteristics, available utilities and maintenance requirements.<\/p>\n<h3>Can landfill settlement damage leachate extraction wells?<\/h3>\n<p>Yes. Landfill settlement can cause bending, shear, buckling or displacement of both vertical wells and side-slope risers. Modern systems should therefore be designed to accommodate settlement while retaining pump access and provision for inspection and eventual replacement.<\/p>\n<h3>How are landfill leachate levels monitored?<\/h3>\n<p>Leachate levels are measured at designated monitoring points within each landfill cell or hydraulically separated area. Monitoring points should include locations away from the active pumping system so that the recorded level represents conditions across the wider leachate catchment.<\/p>\n<h2>Conclusion<\/h2>\n<p>The fundamental principles of landfill leachate extraction have changed surprisingly little.<\/p>\n<p>Leachate must be collected, conveyed to suitable extraction points, removed reliably and transferred to storage, treatment or disposal.<\/p>\n<p>What has changed considerably is the level of engineering now expected around those basic functions.<\/p>\n<p>Modern landfill leachate extraction needs to take account of <strong>environmental permit compliance, landfill settlement, long-term maintainability, landfill gas interaction, drainage-system performance, monitoring, telemetry, redundancy and eventual infrastructure replacement<\/strong>.<\/p>\n<p>The most successful systems are consequently not necessarily those containing the most sophisticated pumps.<\/p>\n<p>They are the systems in which the <strong>drainage layer, extraction wells, pumps, transfer pipelines and monitoring equipment continue to function together throughout the operational and aftercare life of the landfill<\/strong>.<\/p>\n<h3>Further Reading<\/h3>\n<p><a href=\"https:\/\/leachate.co.uk\/main\/leachate-extraction\/leachate-collection-system-pricing\/\">Information about leachate extraction system prices.<\/a><\/p>\n<hr \/>\n<p><em>First published in January 2011 and substantially reviewed and updated for current landfill engineering and Environment Agency guidance in 2026.<\/em><\/p>\n<div class=\"soc_custom_post_ad soc_none\"><p><a title=\"Sewage design guide banner\" href=\"https:\/\/leachate.co.uk\/main\/product\/the-sewage-waste-treatment-design-guide\/\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/leachate.co.uk\/main\/wp-content\/uploads\/2022\/01\/Sewage-Treatment-pdf-banner-800x30-1.webp\" alt=\"Sewage Treatment pdf banner\" width=\"800\" height=\"130\" \/><\/a><\/p><\/div>","protected":false},"excerpt":{"rendered":"<p>Landfill leachate collection and extraction explained, including extraction wells, boreholes, side-slope risers, pumps, pipework, monitoring, settlement and modern Environment Agency requirements.<\/p>\n","protected":false},"author":1,"featured_media":1198,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","jetpack_post_was_ever_published":false},"categories":[28],"tags":[],"class_list":["post-114","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-leachate-extraction"],"jetpack_featured_media_url":"https:\/\/leachate.co.uk\/main\/wp-content\/uploads\/2011\/01\/landfill-leachate-collection-and-extraction-article-featured-image.webp","_links":{"self":[{"href":"https:\/\/leachate.co.uk\/main\/wp-json\/wp\/v2\/posts\/114","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/leachate.co.uk\/main\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/leachate.co.uk\/main\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/leachate.co.uk\/main\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/leachate.co.uk\/main\/wp-json\/wp\/v2\/comments?post=114"}],"version-history":[{"count":6,"href":"https:\/\/leachate.co.uk\/main\/wp-json\/wp\/v2\/posts\/114\/revisions"}],"predecessor-version":[{"id":1204,"href":"https:\/\/leachate.co.uk\/main\/wp-json\/wp\/v2\/posts\/114\/revisions\/1204"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/leachate.co.uk\/main\/wp-json\/wp\/v2\/media\/1198"}],"wp:attachment":[{"href":"https:\/\/leachate.co.uk\/main\/wp-json\/wp\/v2\/media?parent=114"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/leachate.co.uk\/main\/wp-json\/wp\/v2\/categories?post=114"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/leachate.co.uk\/main\/wp-json\/wp\/v2\/tags?post=114"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}