Treated Water Sea Outfalls for Wastewater Treatment Plants

Employer

Ministry of Energy and Water

Role of BUTEC

Council for Development and Reconstruction (CDR)

Awarded

Main contractor in JV with Land & Marine for Tripoli’s Sea Outfall Main contractor for Civil and Sea Outfall Works for Jbeil, Batroun and Chekka

Completed

2005 – Chekka 2008 – Tripoli 2009 – Jbeil 2010 – Batroun

Scope of Work

EPC on turnkey basis including testing, commissioning and maintenance for 4 sea outfalls to discharge treated water offshore into the sea.

Although the UV tertiary treatment ensures the elimination of pathogenic agents, a model simulating the discharge dilution using CORMIX-GI was developed in order to protect the frontal coast from any risk of pollution. CORMIX-GI is a program approved by the US Environmental Protection Agency (EPA).

The simulation methodology was adopted in optimizing the proposed outfall to assure appropriate dilution rates that meet MED POL II seawater quality standards, which are consistent with the standards disseminated by the Ministry of Environment Decree (1/52).

Projects in Figures

	Chekka	Tripoli	Jbeil	Batroun
Length	1,200 m	1,475 m	910 m	760 m
Type	GRP SN 5000	HDPE, SDR 26PE100	HDPE, SDR 26PE100	HDPE, SDR 26PE100
DN	300 mm	1 600 mm	500 mm	350 mm
Under Seabed Submersion	1.5 m	1 m	2 m	2 m
End Suction Diffuser Length	20 m	175 m	75 m	17.5 m
Diffuser Risers	3, DN 200 mm	16, DN 700 mm	16, DN 500 mm	8, DN 110 mm
Reinforced Concrete Ballasts	Thrust block at each direction change	Collar every 2 m	Collar every 5 m	Collar every 5 m