WwTP Llandewi Brefi, UK
Tertiary Solids Removal
Client: DCWW, UK
Keywords: Wastewater, tertiary treatment, continuous sand filter, solids removal, Fe, P
WwTP Llandewi Brefi (operated by DCWW) in the UK is a small unattended site with a capacity of 8,000 PE. Early 2020 a continuous tertiary sand filter has been implemented to initially remove suspended solids.
The system is running in a continuous mode, which means that – irrespective of the actual feed flow to the WwTP – the tertiary filter is in operation by introducing reliable recycling feature. The continuously released wash water is routed by gravity into the head of the works. This helps in keeping the upstream works wetted in low influent flows. This allows the plant to run 24/7 with a minimum of site supervision.
If required a tertiary dosage of coagulants onto the sand filter feed pipeline may be added for further removal of soluble phosphorus.
By remotely monitoring the tertiary filter using Sand-Cycle the continuous uninterrupted proper functioning is easily checked without the need of a site visit. Anomalies, if any, are directly reported and focused actions may be taken if and when required.
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