Tamar Renewable Power (Hoddesdon) Ltd has been granted a permit by the Environment Agency for its Hoddesdon Anaerobic Digestion Facility.
The facility, which will process up to 66,000 tonnes per annum of biodegradable waste, incorporates the following operations:
- anaerobic digestion (AD) plant – consisting of a waste reception building, digesters and storage tanks; and
- combustion plant – consisting of two combined heat and power (CHP) engines and an emergency flare.
Biogas drawn from the digesters will be used to generate electricity and heat from the two CHP engines with an aggregated thermal input of 7.5 MW. The majority of the electricity produced will be fed into the National Grid with a proportion used at the facility. The heat produced from the engines will be recovered via heat exchangers.
By-product from the process (whole digestate) will be separated and the liquid fraction will be transferred to two storage tanks and re-used in the digestion process or spread on land as a fertiliser. The environmental permit does not authorise the spreading of solid or liquid digestate on land.
There will be no process discharges to controlled waters. Uncontaminated site surface water run-off arising from rain will be re-used in the AD facility or discharged to the River Lee Navigation (via attenuation pond) after passing through an oil interceptor.
The site will be provided with hardstanding and secondary containment constructed in line with industry best practice standards to reduce the impact of pollution to surface water and groundwater.
There are three internationally designated ecological sites within 10 km of the Installation (Wormley-Hoddesdon Park Woods, Epping Forest and Lee Valley). Thirteen non-statutory sites and one Site of Special Scientific Interest (Rye Meads) are located within 2 km of the Installation.
Assessment by the Environment Agency shows that emissions from the installation are unlikely to have an adverse impact on interest features of the ecological sites.
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