This follows to the General Procurement Notice published in the daily newspaper ""Le Soleil"" of 25 January 2018. 

The Government of the Republic of Senegal has obtained from the French Development Agency (AFD) and from the Dutch Agency for the enterprise (RVO) with the DRIVE program, and from the State of Senegal funding to carry out part of the project to clean up Hann Bay, Dakar, Senegal. The European Union is also instructing additional funding through a delegation of funds to AFD.

The National Office of Sanitation of Senegal (ONAS), Project Owner, intends to allocate part of this funding to the Sewage Treatment Plant component for the design and construction of a wastewater treatment plant ( STEP). 

As a reminder, as part of its investment program aimed at meeting the needs for sanitation and wastewater treatment dictated by the urban and socio-economic development of the city of Dakar, ONAS is carrying out the first phase of the project. remediation of the Bay of Hann consisting of: 

- the realization of sanitation networks aimed at strengthening the connection rates to the sewerage networks (Secondary industrial and household networks);
- the construction of a 15 km interceptor acting as a system for the transfer of raw wastewater to the proposed WWTP; 
- the realization of a STEP; 
- the realization of a system of discharge at sea (emissary at sea). 

The invitation to tender for the design / construction of the WWTP will be governed by the procedures and eligibility criteria of the aforementioned donors and the State of Senegal. 

The Client intends to pre-qualify companies for the design and construction of works and equipment that will allow the treatment of water, sludge and biogas sectors as follows:

- Water sector: pretreatment (screening, grit removal and deoiling), primary treatment (primary settling), secondary treatment (the latter component being conditional in implementation); 
- Sludge die: extraction, thickening, anaerobic sludge digestion and mechanical sludge dewatering, some of which is conditional in production; 
- Biogas sector: biogas treatment and recovery (heating and cogeneration systems), some of which is conditional on completion.

The completion of Tranche 1 of the treatment plant concerns a capacity of structures corresponding to the 2026 horizon. It includes pretreatment, primary treatment with anaerobic sludge treatment and energy recovery of biogas and also includes a conditional part. concerning secondary treatment and treatment of sludge / biogas generated by the corresponding secondary treatment. The completion of the conditional part is subject to obtaining funding for this component from the European Union.

Tranche 2 (expansion of capacity by 2036) is not part of this contract. In Tranche 1, the 2036 horizon will only be taken into account in the design and securing of the space required for the implementation of the works (obligation to leave sufficient free space on the site to receive future development) as well as the design and sizing of the raw water distributor at the entrance of the treatment plant. 

The breakdown of Tranche 1 into sub-lots is presented below, with a basic offer and a mandatory variant that are part of a single lot (the bidder must answer all sub-lots). The tables also mention the donors financing each sub-lot:

The BASIC OFFER includes the design and implementation of the following: 

Sub-lots Sources of Financing 
1. General site layout, pretreatment, primary treatment and primary sludge thickening 50% AFD 50% RVO 
3a. Digestion and dewatering of sludge - primary sludge only 50% AFD 
50% RVO 
4a. Biogas and cogeneration - primary sludge only 100% State of Senegal 

 Deadline of Submitting EOI: February 7, 2019 - 10:00

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