The existing domestic sewage treatment plant was undersized and unable to cope with the volumes of sewage coming into the plant. This resulted in frequent tankering from the plant to remove raw effluent. This task would have been ongoing for as long as the client was an active holiday village.
Jems Environmental was appointed the main contractor for the installation of upgrade works at the site. The client were looking to install a system that would be able to successfully treat the required volume of sewage from the park and that would meet the consent requirements of National Resources Wales. This would greatly reduce the tanker costs at the plant.
The system was upgraded from a membrane filtration system to a more traditional settlement system and additional biological treatment capacity was installed.
The system has proved successful in many ways: Firstly, tanker costs have reduced by around 75% as the plant is capable of treating greater flows.
Secondly the effluent quality is well within the consent limits at <7mg/l BOD, 5mg/l SS, 0.1mg/l NH4N 5mg/l Fe.
Thirdly, the O&M costs have reduced as the plant is no longer operating in crisis mode. These successes resulted in an overall cost saving of £200k per annum to the client.