Water Treatment Plant 1.2

Water Treatment Plant 1.2 is one of five industrial water treatment plants we delivered in Qatar. Under a full EPC and O&M scope, we treated groundwater drainage to discharge standard and maintained the plant in service from 2019 through to handover in 2021.

Project scope (EPC)

• Engineering & design of the physical–chemical treatment process and supporting civil, mechanical, electrical, and instrumentation works.
• Procurement & construction of the plant, including chemical dosing, filtration, and sludge-handling systems.
• Commissioning and performance testing to confirm compliance with the treated-water specification.
• Operations & maintenance covering staffing, laboratory analysis, monthly reporting, consumables, and sludge disposal through to handover.

Design & process

The plant treats groundwater drainage from a dewatering process, reducing the pollutant load before controlled discharge. It is designed for a hydraulic load of up to 6,000 m³/day (70 l/s). Designed for an inlet load of up to TSS 1,000 mg/l, the treatment train delivers a treated-water specification of TSS ≤10 mg/l, oil & grease ≤0.5 mg/l, BOD₅ ≤10 mg/l, COD ≤20 mg/l, E. coli ≤2.3 MPN/100 ml, and pH held between 6.5 and 7.5.

Technologies deployed

• Coagulation and flocculation using Polyaluminium Chloride and polymer dosing
• Sedimentation and clarification
• Multimedia / sand filtration
• Activated carbon adsorption
• Manganese and iron (Mn/Fe) reduction
• Sludge thickening and removal
• Independent diesel power generation with standby redundancy

Construction & commissioning timeline

• Operations and maintenance documented from January 2019.
• Ongoing maintenance of the filtration, dosing, and power systems to sustain treated-water quality.
• Continuous O&M maintained through to project handover in 2021.

Quality & HSE

Delivery was governed by our QA/QC approach — inspection, testing, and documentation against the treated-water specification — and by HSE management covering site safety, environmental control, and regulatory compliance. Laboratory testing and monthly operating reports tracked performance throughout the operations period.

Engineering challenges solved

• Sustaining a consistent treated-water specification from a variable inlet load through carefully controlled coagulant and flocculant dosing.
• Keeping the filtration train available through planned media servicing and replenishment.
• Operating reliably on independent diesel generation, including routine generator servicing and fault rectification.
• Coordinating cross-border supply of chemicals and filter media to the Qatar site.

Operations and maintenance were provided by SGS through to handover in 2021. The plant is no longer under our O&M; the experience, systems, and standards demonstrated here are directly transferable to our solar PV and civil infrastructure delivery.