Project Details:

Derg WWTW

Derg Water Treatment Works at Ardstraw, supplies high quality drinking water to a wide area, at a rate of 25 million litres per day (ML/D). Northern Ireland Water identified a requirement to dose sulphuric acid when water was being extracted from the River Strule in order to achieve the necessary pH for successful coagulation due to the higher alkalinity of the river water.

Enisca successfully tendered and was awarded the contract to design, construct and commission a new 96% Sulphuric Acid dosing facility at the Derg Works.

Enisca developed a design solution to deliver a modern chemical dosing system for the Derg Water Treatment Works in compliance with all applicable standards and specifications. The installation and commissioning works were carefully planned for the integration of the new process into the existing site control system. With the end user in mind, and prioritizing safety precautions, the new plant was designed within a dedicated building, with two plant rooms, one for tank storage, and one for dosing pumps and controls.

Both dry and wet commissioning was completed and demonstrated without any impact on the existing process. This was achieved through an agreed phasing period and proactive programming by Enisca ensuring the existing process was not compromised.

Enisca executed a robust commissioning plan that considered and detailed associated risks including COSHH and potential environmental impacts, which was understood and followed by Enisca and Site Operations at all times.

Associated works included:

  • Stainless Steel Storage Tank, all associated pipe work, dosing pumps, control valves & safety shower to provide a fully operational and maintainable system.
  • MCC/PLC and all associated/interconnecting cabling
  • All Instrumentation, automation and control systems to provide fully functional system.
  • Building Services

Project Details

  • Client:
    Northern Ireland Water
  • Scope:
    Design & Build
  • Capacity Of Plant
    21m3 Acid Storage / 0 – 60 l/hr Pumping
  • Start Date:
    July 2015
  • Completion Date:
    March 2016
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