Overview
M/s. iFluids Engineering & Consultancy WLL has been awarded the Safety & Operability Study (SAFOP) for the Waste Water Treatment Plant of the North Field East Onshore Project EPC-1. This project is sponsored by Qatar Gas (QG) and Qatar Energy – RLIC, with Chiyoda-Technip Joint Venture (CTJV) as the EPIC contractor and METITO Qatar WLL as the subcontractor for engineering works.
What is a SAFOP Study?
As part of EPC activities, the SAFOP study is conducted for the electrical facilities of the Waste Water Treatment Plant. This study focuses on modification works at the existing WSS-01 S/Stn No 1 A190/A310, and its extension to the new WWTP S/Stn A10/A20 and New WWTP S/Stn MCC Switchboard.
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Project Objectives
The Waste Water Treatment Plant (WWTP) is designed to treat domestic sewage with a total capacity of 15,830 m³/day. The organic loading parameters include:
- BOD Load: 4305.76 kg/day
- COD Load: 9323.87 kg/day
The plant is divided into three biological streams (each handling 5,277 m³/day) to enable phased operation. At the initial stages, each stream manages 30% of the total flow (1,585 m³/day) with the following treatment capacity:
- BOD: 431.12 kg/day
- COD: 933.57 kg/day
- TSS: 351.87 kg/day
- TKN: 63.4 kg/day
- Alkalinity: 396.25 kg/day
- TDS: 724.35 kg/day
Treatment Process
1. Pre-Treatment
The pressurized domestic sewage from the lift station is equalized in aerated balancing tanks to manage peak loads and regulate flow over 24 hours. The Compact Inlet Headworks include:
- Screening System
- Grit and Grease Removal System
2. Biological Treatment
Sewage is split into three secondary treatment streams, consisting of:
- Aeration Tanks
- Secondary Settling Tanks
3. Disinfection & Filtration
- Chlorine Contact Tanks for disinfection
- Pressure Sand Filters for water polishing
- Treated Sewage Effluent (TSE) Tanks for irrigation and tanker filling
4. Sludge Treatment & Disposal
- Excess sludge from secondary settling tanks is processed in aerated sludge holding tanks
- Dewatering using Belt Filter Press
- Stabilization using powdered lime
- Final disposal at a designated site in RLIC (with 18% solids content)
Importance of Wastewater Treatment
Key Objectives:
- Protect public health
- Preserve the environment
- Enable reuse of treated sewage
Sewage Contaminants Include:
- Organic Solids: Biodegradable materials
- Inorganic Solids: Suspended and dissolved particles
The Extended Aeration Process:
An activated sludge process that ensures complete biodegradation of organic matter into stable end products.
WWTP Facility Components

The Waste Water Treatment Plant (WWTP) includes:
- Balancing Tanks & Air Blowers
- Compact Inlet Headwork
- Distribution Chamber
- Aeration & Secondary Settling Tanks
- Sodium Bicarbonate & Sodium Hypochlorite Dosing Systems
- Pressure Sand Filters
- TSE Tanks & Tanker Filling Stations
- Sludge Holding Tanks & Belt Filter Press Units
- Lime System & Odor Control Unit
- Drain Pit, Drain Pumps, and Scum Drain Systems
Conclusion
The SAFOP study for the Waste Water Treatment Plant (WWTP) of the North Field East Onshore Project EPC-1 ensures safe operations, environmental sustainability, and optimized performance.