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Landfill
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Leachate – something's brewing there
Landfill leachate results from permeating surface water and water pressed out during compaction of the waste mass. It can contain harmful substances such as various salts, ammonium and carbon compounds which are flushed out in the process and represent a serious threat to underground and surface water. For that reason, the leachate is gathered via a ground seal into drainage pools and wells and fed to a multistage treatment plant. Level measurement in the well controls a drainage pump and also gives the landfill operator important information on the status of the landfill.
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Level measurement in wells with VEGAWELL 52
Well galleries are used to systematically gather leachate. They are made of long steel tubes driven vertically through the cross section of the dump. Water collects at the bottom of the tube and is forwarded to the leachate treatment plant via special submersible pumps. The level in the individual tube is measured with a VEGAWELL 52 suspension pressure transmitter. With its PE coating, it has optimum protection against the corrosive leachate. The output signal controls the frequency converter of the pumps. By means of this measurement, the special pumps are protected from dry running, and the leachate level is prevented from getting too high.
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Leachate treatment
The free oils contained in the leachate are separated by gravity into plastic settling tanks. After further chemical treatment, the leachate arrives at a stripper column. This is a slender, approximately 3 m (10 ft) high reactor into which air is pumped from below and leachate from above. To facilitate the reaction, the middle zone of the column is packed with carrier material. Here, nitrogen compounds are converted and carbon compounds degraded with the help of microorganisms. This pre-treated leachate is finally cleaned and filtered in additional physical stages and then separated as distillate. To ensure the optimal operating conditions inside the stripper column, an accurate level measurement in the bottom area of the column is necessary.
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Level measurement in the stripper column with VEGAFLEX 63
Due to the influx of air, the surface of the medium is very agitated. Direct level measurement inside the column is impossible. A VEGAFLEX 63 with guided microwave in the bypass tube is used for this application. The bypass tube itself forms a coaxial system together with the probe rod. Reliable measurement is thus guaranteed also in case of welded seams, material deposits as well as overfilling up to the process fitting.
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VEGAWELL 52
- Front flush CERTEC ceramic measuring cell
- Suspension cable and measurig probe protection of high-resistance PE
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VEGAFLEX 63
- Optimal for bypass tubes
- Reliable measurement for all process conditions
- Chemically highly resistant material
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