Aldbrough, Gas Storage

Constructed Wetlands: Groundwater Treatment Plants (GWT)

Created at: 25 Aug 2016

Description

Needs<br>AMEC were contracted to Scottish and Southern Energyto construct and commission an underground gas storage facility at Aldbrough inthe East Riding of Yorkshire. Methanol is used as a part of the process and aMethanol Recovery Unit (MRU) allows it to be recycled. The MRU generates a lowvolume of effluent which is blended with other treated effluents and dischargedfrom site. The effluent carries a relative low level of Methanol and Benzenewhich needs to be removed from the effluent stream prior to discharge. A numberof options were considered for methanol removal but ultimately a reed bedtreatment system was selected as the most suitable for the site, however therewas little room available on the site.<br><br><br>SolutionMethanol is commonly usedas a source of carbon in biological wastewater treatment systems which have anutrient limited influent. So the reduction in methanol would not be an issue.Benzene also can be relatively easily degraded in wetland systems. The mainchallenge with this project was to design and install a system that would fitin the limited area available. A vertical flow system was selected as itrequired a much smaller footprint to achieve the required treatment compared toa horizontal flow system solution. Required land take was further reduced bythe use of pre-cast concrete wall sections. Thus a 210m2 gravel based vertical flowbed was installed planted with Phragmitesaustralis.

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