Yaxley, RB Organic

Constructed Wetlands: Groundwater Treatment Plants (GWT)

Created at: 25 Aug 2016

Description

Need<br>RB Organic process and supply over 30,000 tonnesof organic vegetables every year. As part of the process soil is washed fromthe vegetables and the resulting dirty water requires treatment prior todischarge. Historically, the water was treated with chemicals and passed, bybatch process, through clarifiers where solids were settled out. Being faithfulto the philosophy and ideals of organic farming, RB Organic were keen toeliminate the use of chemicals and reduce the level of labour associated with desludgingand chemical dosing operations. The site produces 170m3 of wash water per daywhich has to meet a standard of less than 30mg/l Suspended Solids and 50 mg/lBOD prior to discharge.<br><br>Solution<br>ARM designed and constructed a 3 stage wetlandtreatment system to achieve the required removal of solids and BOD from thevegetable wash water. A settlement lagoon drops out the solids and is followedin series by two 800m wetland systems which provide further settlement ofsuspended solids and reduction of BOD. The first is a surface flow system witha soil substrate planted with Typha latifolia and thesecond a subsurface flow horizontal reed bed with a gravel substrate planted withPhragmites australis.

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