Ever wondered just how much the moss filters in Hereford cost?
A freedom of information request has revealed all the key details.
The purchase price of each filter:
CT 309 (The Courtyard) – £40,374.54
CT 310 (Eign Gate) – £43,911.27
C 311 (Eign Street) – £34,291.35
‘Running/maintenance for all 3 units including labour, capital replacement parts, replacement of moss mats and reporting/monitoring data for 60 months = £61,048.’
What is the mass of carbon dioxide (NOT volume) removed by each filter each year?
‘The moss filter units utilise CO₂ (like any plant) and have been estimated to produce a reduction of approximately 342kg per year (on a moss filter footprint of 9m2).
‘The CO₂ is not removed and disposed of, but is used by the moss in the unit during photosynthesis producing O₂ as a by-product.
‘Air pollution can be caused by solid particles such as soot or gases like Nitrogen Dioxide (NO₂).
‘Particulate matter makes up a large part of air pollution in a city, it consist of particles of less than 10µm.
‘The moss filters up to 82% of fine particulate matter from the ambient air.
‘The total mass filtered out of the air volume since commissioning (calculated following DIN EN ISO 16890) is as follows.’
CT311 142.1g
CT 309 140.2g
CT 310 298.3g
Please see the following link to view the information in more detail on the Herefordshire Council website:
