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China: Wastewater Treatment "Dragonfly Zone" for Shanghai Chemical Industry Park to be Developed by Suez

Editor: Alexander Stark

The French company Suez has won a design contract for the rehabilitation and expansion of the discharge constructed wetland at the Shanghai Chemical Industry Park, the largest petrochemical platform in Asia

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Suez is in charge of industrial wastewater treatment and water supply for the Shanghai Chemical Industry Park since 2002.
Suez is in charge of industrial wastewater treatment and water supply for the Shanghai Chemical Industry Park since 2002.
(Source: Suez Environnement)

Shanghai/China — This contract, which represents an investment of € 18,5 million, is the company's first Zone Libellule (see below for more details) project in Asia and the largest for treating industrial wastewater.

Suez is in charge of industrial wastewater treatment and water supply for the Shanghai Chemical Industry Park since 2002. The industrial water and wastewater specialist also handles the treatment and recovery of hazardous waste since 2006. This new contract aims to rehabilitate the existing 13 hectares of discharge constructed wetland and to design a 23 hectares expansion. This zone is located downstream of the wastewater treatment plant operated by the company. It is designed not only to achieve the tertiary treatment of effluents, but also includes guarantees for the elimination of pollutants, improving the quality of the water discharged into the environment and allowing for its re-use. Construction will begin in mid-2017, and the zone will be launched in 2018.

What is a Zone Libellule (Dragonfly Zone) ?

This Zone Libellule uses the treatment capabilities of the natural environment. The design of the Scip project draws on feedback from the Zone Libellule pilot project — first put into operation in 2009 at the municipal wastewater treatment plant in Saint Just (Hérault, France) — as well as insights from the Zhart R&D project (2012–2016) managed by the Cirsee, the main research centre at Suez. Five years of research have allowed to enhance the Zone Libellule concept, by optimizing its design based on the micro- and macropollutants treatment goals and the local context, the company said, adding that this ecological engineering innovation would help improve the quality of Scip’s treated wastewater, as measured by several industrial effluent pollution parameters: Chemical Oxygen Demand (COD), metals, phosphorus, nitrogen, etc. Several hundreds plant species will be chosen based on their treatment capabilities, their salinity tolerance (owing to the high level of salinity in the park’s effluents) and their ecological characteristics. The diversity of habitats created would allow for colonisation by local plant and animal species adapted to live in wetlands.

The Zone Libellule is an artificial wet area able to be placed downstream of the wastewater treatment plant and in which the development of biodiversity contributes towards combatting micro-pollutants, limiting their diffusion into fresh or salt water sources.

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