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Project Rasgas - RAS LAFFAN | QATAR

Capacity in IE : 3 x 4500
Capacity in m³ per day : 3 x 1440
Year of construction : 2006
Project owner : CTJV
Consultant : Technip

TYPE OF TREATMENT

Water treatment
For each unit :
- Screening 2 mm
- Buffer tank 600 m³
- Aeration tank 2000 m³ with air diffusers
- 2 blowers 74 kW
- Phosphate removal
- Deaerator
- Floating matters storage tank
- Settling tank Ø 14,50 m
- Sand filter 80 m³/h
- Sludge thickener with picket fence

Sludge treatment
Common equipments for the 3 units :
- Anaerobic sludge digestion
- 2 sludge centrifuge decanters
- Mobile sludge storage skip

Smells treatment
- Deodorizing of the waste water lifting station

TECHNICAL DATA OF PLANT

	Capacity of treatment	Treated water discharge standards
Capacity of treatment	13 500 IE
Daily volume	4 320 m³/d
Peak flow	750 m³/h

Biological oxygen demand (BOD5)	1 728 kg/d	50 mg/l
Chemical oxygen demand (COD)	2 970 kg/d	150 mg/l
Suspended solids	1 728 kg/d	50 mg/l
Total Kjeldahl nitrogen	192 kg/d	75 mg/l
Total nitrogen	192 kg/d
Total phosphorus	48 kg/d	9,87 mg/l

The Inhabitant Equivalent (IE) is a notion used in sanitation to evaluate the size of waste water treatment plants, it corresponds to an estimate of pollution caused by the "inhabitant equivalent" defined thus :
- 60 g/inhabitant/day for DBO5
- 90 g/inhabitant/day for suspended matter
- 15 g/inhabitant/day for total nitrogen
- 4 g/inhabitant/day for total phosphor

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