Successful Greenstream© filter pilot

  • Client Petrochemische industrie
  • Country The Netherlands
  • Location Rotterdam-Botlek
  • Status In Progress

Remediation of a spill benzene with own designed filter On a location near the flare on the premises of a petrochemical company in Rotterdam-Botlek, where a benzene spill occurred in the past (after 1987). This has contaminated the soil and the groundwater with benzene and, to a lesser extent, mineral oil and volatile aromatics. Strukton Milieutechniek looked after the design and realisation of the in-situ remediation using its own in-house developed Greenstream© filter, initially on the basis of a pilot. A single Greenstream© filter was installed at a final depth of approximately 4 m b.g.l.; the circulation flow of the pump used with the filter varied from 90 to 120 litres per hour. To prevent iron scaling, the circulated water was regularly acidified. In addition, two soil air extraction filters were installed.

With the Greenstream© filter the contamination is cleaned up faster and with less costs.


Work in progress Rotterdam-Botlek


Using a Greenstream© filter – which is similar to a traditional compressed air injection filter in terms of dimensions – the contamination was remediated much faster and at a lower cost. On the one hand, this result was achieved through infiltration with water with a higher (saturated) oxygen content and on the other hand through a larger area of influence.

The Greenstream© filter has been developed by to remediate more efficiently and sustainably.

How does the Greenstream© work ? The traditional approach to remediating this type of contamination often makes use of compressed air injection and soil air extraction systems. Strukton Milieutechniek proposed to use the Greenstream© filter. The Greenstream© filter was developed by Strukton Milieutechniek pursuant to its conviction that a ‘smart’ filter would provide for more efficient and more sustainable remediation. The filter was developed into what it is today on the basis of calculations, a computer model, a test filter, a laboratory set-up and finally, this pilot. The filter has a single pump and three different perforation depths (for extraction and infiltration), combined with suction pipes. The filter produces the same result as traditional compressed air injection systems faster (due to the infiltration of oxygen-rich water), while using fewer raw materials and less energy (due to the larger area of influence) and with reduced inconvenience and evaporation of contaminants. At the same time, it saves on costs. The filter can be used for aerobic as well anaerobic remediation. Furthermore, acids, nutrients and/or bacteria can be co-injected.

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