Chorfech 24 - Tunisia

Constructed Wetlands: Groundwater Treatment Plants (GWT)

Created at: 25 Aug 2016

Description

The pilot plant planned in Chorfech (Tunisia) is a partnership between the project “Sustainable Concepts Towards a Zero Outflow Municipality (Zer0-M), mainly the Tunisian partner Centre de Recherches et des Technologies des Eaux (ex INRST, LEE), and the Office National d’Assainissement (ONAS). Zer0-M is a project in the Euro-Mediterranean Regional Programme for Local Water Management (MEDA Water programme), funded by the European Commission and the national partners of the project. ONAS participates with 20% of the cost of the pilot system as indicated in the agreement signed between CERTE and ONAS in June 2006.The pilot activity is mainly meant as a demonstration of sustainable water management solutions as suggested by Zer0-M (low-cost wastewater treatment), which shall prove that these solutions work under real conditions and ultimately allow the further spreading of the demonstrated techniques. The pilot activity will also help to gain experience with the techniques implemented under real conditions and improve them if necessary until they can be recommended for wide application in rural settlements in Tunisia.Last but not least they shall help to ease the difficulties in water and wastewater management faced by the fast growing community of Chorfech, a rural settlement in semi-arid climate with constantly increasing water consumption and very limited financial resources for the supply and sanitation services. Chorfech is a rural settlement of about 50 houses counting 345 inhabitants. It is located in the Northwest of Tunis about 24 Km (national road GP8) between Tunis and Bizerte. IRIDRA's specialists worked on this project from the design to the supervision of works.The WWTPP adopted at Chorfech consists of one Imhoff tank for pre-treatment, and three stages in series: a first, horizontal subsurface flow constructed wetland (CW) stage, a second subsurface vertical flow CW stage, and a third horizontal flow CW stage. The sludge of the Imhoff tank will be treated in a sludge composting bed. The mean overall removal rates performed by the WWTPP of Chorfech during the monitored period (May-June 2010) have been respectively 97% for TSS, 95% for COD and 97% for BOD5, 71% for total nitrogen and 82% for total phosphorus

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