Orhei - Moldova - 20000 pe CWTP

Constructed Wetlands: Groundwater Treatment Plants (GWT)

Created at: 25 Aug 2016

Description

The city of Orhei was equipped with an old wastewater treatment plant, a high rate percolating filter, very expensive especially for its localisation on top of the hill where the city wastewater ha to be pumped up, and no longer sufficiently effective for the treatment itself of the whole city. For this reason the Moldovian government, under a World Bank programme and relative feasibility study, decided to replace it with a constructed wetland system at the service of about 26000 inhabitants, and few agro-industries. <br><br>The Orhei CWTP consists of screening, grit removal and equalization as a primary treatment; the primary sedimentation phase has been skipped, because it's carried out directly at the secondary treatment stage by the so-called French system. The system consists of 4 lines operating in parallel independently. Each line is composed of two stages in series:1st Stage - French system (vertical flow reed beds fed with raw wastewater where there's a formation of a sludge aerobic layer on the surface, removed every 10-12 years.2nd stage - vertical submerged flow reed beds.Total surface about 40000 m2 (4ha). Surely one the largest Constructed Wetlands for secondary treatment of municipal wastewater present worldwide!<br><br>Design Team: SWS Srl, IRIDRA Srl, HYDEA Srl, POSH&Partners GmbH<br><br>Realisation Works by: HEILIT Umwelttechnik GmbH in association with BioPlanta GmbH

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