Shanghai Chemical Industry Park (SCIP), located south of Shanghai and north of Hangzhou Bay, covers an area of 36.1 km2. It is Asia's largest, most advanced petrochemical base and operates at world class standards. SUEZ won the plan and design contract for the SCIP wetland renovation project in 2017. To date, it is the group's largest wetland project, employing SUEZ's "Zone Libellule” concept design. It is also the first to use wetland to treat industrial wastewater.
Using wetland to purify industrial wastewater
A wetland works to purify water quality, prevent flooding and drought, conserve water, and serve as a wildlife habitat. In recent years, some parks have constructed artificial wetlands to improve the ecological environment. One original aim of the SCIP wetland project design was to further purify the treated wastewater and minimize its impact on the environment. However, the treated industrial wastewater is still highly saline, thereby placing high demands on wetland design and operations. For this reason, multiple experiments are needed to customize solutions according to the characteristics of the industrial water, and to carry out management and maintenance to standards that ensure stable future operations.
SUEZ provides a solution for SCIP to partially renovate the first phase of the wetland and construct the new wetland for the second phase. This improves the wetland function of treating industrial wastewater naturally. The wetland, located downstream of a WWTP we operate, can achieve tertiary treatment of wastewater, effectively eliminate pollutants, and improve the quality of water discharged to the natural environment. The result is recycled water.
To cope with the high salinity of the park’s industrial water, the project design drew lessons from SUEZ's "Zone Libellule" pilot program, together with the outcomes of an artificial wetland research project (2012-2016). Based on these insights, coastal salinity-tolerant plants were introduced. The wetland design also incorporates water treatment and landscaping, integrating ecological and aesthetic features. It serves scientific, educational and sightseeing purposes too.
The SCIP wetland renovation project covers a total area of nearly 50 hectares, including 26 hectares of Phrase I and 24 hectares of Phrase II.
This ecological project can contribute to expanding the local biodiversity, raising the quality of treated wastewater, and significantly improving industrial wastewater pollutants, such as COD, metals, phosphorus, nitrogen and other indicators.