Water treatment projects in Algeria, Africa

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Project: Package sewage treatment plant
Client: Panaqua Process Ltd
To design and supply a 195 m3/day constant transfer sewage treatment plant and sewage pumping station.

Issues affecting algeria include: dumping of raw sewage, petroleum refining wastes, and other industrial effluents is leading to the pollution of rivers and coastal waters; Mediterranean Sea, in particular, becoming polluted from oil wastes, soil erosion, and fertilizer run off; inadequate water treatment.

The Constant Transfer process represents a significant advance in the biological treatment of raw sewage. The simple and efficient operation of these plants has been proven worldwide with the additional benefit of uncomplicated construction. Choice of the optimum plant configuration can be made to serve populations between 200 and 15000 people.




Operation
The raw sewage flows directly into the aeration tank where an automatically variable level ensures that the inevitable fluctuation of low does not affect the rate of treatment. The mixture of treated sewage and active bacteria is moved at a constant rate from aeration to gravity settlement and this is fundamental to the Constant Transfer system design.

Thus the plant works at a sure steady pace with obvious benefits in efficiency. All the power for aeration, mixing and airlift transfer pumping is provided by low pressure air from an electrically driven air blower in a machinery house, together with the control panel which provides fully automatic control of the plant.

Construction
Constant Transfer plants are constructed from prefabricated units and can be installed on the site with supervised, local unskilled labour. No on-site fabrication or welding is required. Construction can be from reinforced concrete tanks or glass coated steel panel tanks on reinforced concrete bases.

In addition to the basic plant comprising aeration tank(s), settlement hopper(s) and machinery house equipment, facilities can be provided for sludge consolidation, effluent storage, effluent disinfection and pumping. The plant may also require a separate pumping chamber to transfer raw sewage from existing drainage facilities.

Performance
The Constant Transfer plant provides treated effluent to a quality of at least 20 mg/l BOD and 20mg/l suspended solids. Higher quality standards can be achieved with the addition of tertiary equipment. The process is odour free and therefore there are no restrictions on the plant location and it is viable to install the plant inside buildings if required.

Modular design of the plant facilitates the addition of further treatment capacity as and when required to suit local development.