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Domestic and commercial waste sent to landfill

Monitoring landfill gasesLandfill sites containing domestic and commercial waste produce a variety of volatile organic compounds (VOCs), depending on both the materials they contain and the decomposition processes they undergo.

Many of these compounds can be toxic and/or odorous, and so need to be monitored regularly for negative impacts on local communities and the wider environment.

Reflecting this concern, the European Landfill Directive (1999/31/EC) says that all landfill sites (except those for ‘inert waste’) must be monitored at least annually for various priority pollutants, many of which are VOCs amenable to analysis by thermal desorption (TD)–gas chromatography (GC).
 

What Markes can offer

The UK Environment Agency has issued a standard sampling and analytical protocol for compliance with the monitoring requirements of the Landfill Directive. Other European countries are also in the process of drafting compliance protocols.

Siloxanes

Siloxanes are ubiquitous in personal hygiene, health care and industrial products, and as a consequence end up in landfill, where the volatile components are released into landfill gas. When this gas is used for power generation, the siloxanes are oxidised to solid silicon dioxide, which can cause failure of microturbines and catalysts. Fortunately, volatile siloxanes are easily monitored using thermal desorption – contact our specialists for more information.

The UK protocol specifies pumped sampling onto two-bed inert-coated stainless steel sorbent tubes (Tenax® TA–SulfiCarb) followed by analysis with thermal desorption (TD)–GC–MS. This is particularly well-suited to landfill gas monitoring because:

  • The choice of sorbents allows collection of analytes over a wide volatility range, while also avoiding decomposition of the more ‘labile’ analytes that are a feature of landfill gas streams.

  • The high humidity of landfill gas often results in water being collected on the strong sorbents that are needed to monitor landfill gas. However, modern TD systems, such as Markes’ UNITY-xr and TD100-xr, allow the sample to be dry-purged before it enters the gas chromatograph, minimising the amount of water injected into the GC.

 

 

As well as ‘spot-monitoring’ by pumped-tube monitoring using a single TD tube (e.g. with Markes’ ACTI-VOC low-flow pump), multiple-tube samplers such as Markes’ MTS-32 can be employed to assess emission profiles over a longer period.
 

Further information

 

UK
UK
Markes International Ltd
Gwaun Elai Medi-Science Campus
Llantrisant
RCT
CF72 8XL, UK
Tel: +44 (0)1443 230935
Germany
Germany
Markes International GmbH
Schleussnerstrasse 42
D-63263 Neu-Isenburg
Frankfurt
Germany
Tel: +49 (0)6102 8825569
USA (West)
USA
Markes International, Inc
2355 Gold Meadow Way
Gold River
California 95670
USA
Tel: 866-483-5684 (toll-free)
Part of Schauenburg International
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