Accra sewerage improvement project (ASIP)
Accra Sewerage Improvement Works
The Accra Metropolitan Assembly (AMA) wanted to upgrade the sewerage system in the city. Zutari was appointed as sub-contractor to CPP Botswana to design the sewage works and pump stations and also provide assistance during the construction supervision phase.
The Accra Metropolitan Assembly (AMA) engaged Lahmeyer to investigate the sanitation situation and develop a plan and programme to overcome the problems identified. They found that there were many isolated sewered areas in Accra, but the systems had fallen into disuse and needed to be rehabilitated. An expansion of the network was also suggested because many of the residents had septic tanks and could connect to it, reducing pollution.
AMA and the African Development Bank (AfDB) funded the study and proceeded to the construction stage. CPP from Botswana approached Zutari for the design of the sewage works and pump stations; for providing assistance during the supervision phase to ensure that the mechanical works were up to standard and for reviewing the designs, correcting shortcomings, putting them out to tender and supervising contracts.
The first contract dealt with sewage works to treat 7 ml/d, four pump stations and associated rising mains, two gravity sewers and a marine outfall to take treated sewage offshore. Contract 2 involved sewage works to treat 6 ml/d, four pump stations and associated rising mains and a gravity sewer and gravity outfall. Contract 3 rehabilitated and expanded the sewerage network, while Contract 4 entailed purchasing equipment so that the city could maintain its infrastructure. CPP provided most of the construction supervision.
This project will improve the city’s sewerage and sanitation system for the disposal of waste water in an environmentally sustainable manner.
An expansion of the network was also suggested because many of the residents had septic tanks and could connect to it, reducing pollution.
*The Aurecon Africa business has been officially renamed Zutari as at 21 July 2020. Zutari acquired Aurecon Middle East on 20 November 2020.