Water Treatment Plant 1.1

Water Treatment Plant 1.1 is one of five industrial water treatment plants we delivered in Qatar. We treated groundwater drainage from a dewatering process to a controlled discharge standard, and operated and maintained the plant from 2018 through to handover in 2021.

Project scope (EPC)

• Engineering & design across process, mechanical, civil, electrical, and instrumentation disciplines, sizing the treatment train for the design hydraulic load.
• Procurement & construction of the treatment process, including reinforced-concrete foundations and slabs for the filtration trains and the associated mechanical and electrical installation.
• Commissioning and performance verification against the contracted treated-water specification.
• Operations & maintenance — manpower, laboratory testing, monthly reporting, chemical supply, filter-media replenishment, sludge removal, and power generation — 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 2018.
• Filtration upgrade works — new multimedia/sand filters installed on new reinforced-concrete slabs, with bypass pipework added to allow servicing without interrupting treatment.
• 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

• Upgrading the filtration system while keeping the plant in service — new filters were set on new concrete slabs and tied in through dedicated bypass pipework so treatment could continue during the works.
• Maintaining power resilience on independent diesel generation, including standby-generator management, inspection, and repair to protect uptime.
• Holding the treated-water specification against a variable inlet load up to TSS 1,000 mg/l through controlled coagulant and polymer dosing.
• Importing, clearing, and replenishing filter media (sand and activated carbon) into the Qatar site to sustain continuous operation.

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.