HEQ Sewage Treatment – Routine Service in Dundee, Scotland

HEQ routine service Dundee carried out today for an existing customer. During the visit, we recorded an MLSS concentration above 70%, identified a blocked recycle pump, and found the 250 L/min airflow filter fully choked. Each issue was resolved as part of the service to bring the plant back to correct operation.

✅ Service findings

• MLSS concentration > 70% – This indicates excess sludge build-up. Emptying is required to restore headroom and maintain efficiency. While we don’t desludge, we test and advise so operators know when it’s due.
• Recycle pump blockage – One of the two pumps was blocked. Recycle pumps are vital for recirculating settled liquor to maintain MLSS balance. Without them, oxygen uptake falls and treatment destabilises. Pump was cleared and flow proved.
• Airflow filter replacement – The 250 L/min filter was fully choked. A blocked filter restricts air supply from the blower, starving bacteria of oxygen and collapsing the treatment process. Replaced with a new filter, airflow restored and blower readings logged.

🔧 Full service scope

• MLSS sampling, recording, and advice on emptying
• Recycle pump inspection, blockage removal, NRV checks, and proving flows
• Airflow filter replacement with performance check
• Blower voltage and current readings, airflow verification
• Airline integrity test and back-pressure monitoring
• Alarm and control panel function test
• General plant condition inspection and service report issued

With recycle restored and airflow confirmed, the HEQ is operating correctly again. Any odours will settle as the process stabilises.

📅 Service contracts across Dundee & Tayside

We provide annual HEQ service agreements covering MLSS testing, pump checks, airflow maintenance, and full system reports. Regular servicing prevents blockages, restores efficiency, and ensures plants remain reliable and compliant.