Earls Colne WwTW,

Constructed Wetlands: Groundwater Treatment Plants (GWT)

Created at: 25 Aug 2016

Description

Needs<br>Anglian water required a tertiary treatment solution for their site at Earls Colne in Essex. The discharge consents for the site were to be tightened by the Environment Agency. The site had no power available and the cost of introducing a power based tertiary treatment solution was prohibitive. The required improvements in the new discharge consent were focused on the solids and ammonia levels though some reduction in the BOD levels was also needed. The average flow through the works is 1,168m3/d.<br><br>Solution<br><br>The addition of ammonia to the discharge consentspecifies a system which will provide adequate oxygen transfer to achievenitrification of the ammonia to nitrate thus a vertical flow reed bed systemwas selected. The requirement for tight control of solids meant that twoseparate beds operated alternately would be the best technical solution as itwould allow each bed to ‘rest’ during which time organic solids on the surfacewill break down preventing clogging of the surface. The use of vertical bedsrequires batch feed so a siphon was installed to negate the need for batchpumping and power connection. Two beds of 20m x 40m were constructed totalling1,600m2. A stilling chamber between the siphon and the beds was alsoinstalled to allow for some solids settling reducing the solids load passingforward onto the beds.

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