In October 2009, SUEZ signed a contract with PetroChina for the design and build of a wastewater treatment plant with two main objectives: bring petrochemical industrial effluents into compliance with the most demanding standards; and recycle part of these effluents.
In 2010, SUEZ began built on the petrochemical site of a treatment plant combining the best available technologies, with several benefits:
The Chengdu refinery discharges its treated wastewater into the Tuo River, a tributary of the Yangtze. It is therefore vital that PetroChina comply with all sanitary and environmental standards in force, in particular the level of Chemical Oxygen Demand (COD). Thanks to the combination of ozonation and biofiltration, SUEZ obtains high quality treated wastewater.
The new treatment plant comprises no fewer than five treatment processes on the same site, two of which concern the recycling of effluents and stormwater. This is the first installation of this size in China to use a wastewater and stormwater recycling system. It allows PetroChina to conserve water resources, the recycled water produced on site being used for the operational requirements of its refinery.
In operation since end of 2013, the Chengdu water treatment plant is a benchmark for the implementation of the treatment and recycling of wastewater in China.
SUEZ implemented state-of-the-art technology, Oxyblue®, which requires much less ozone and consumes less energy than traditional treatment processes. The plant produces treated wastewater of optimal quality thanks to the combination of two techniques:
The treatment process removes more than 65% of non-biodegradable COD and allows the reuse of more than two thirds of the treated wastewater.
When you browse our site, data may be saved or read from your browser or device. Certain technical cookies are necessary to ensure the site works correctly. These are used for areas such as security, ergonomics and language choice, and are therefore always active. They do not contain any personal data. You can deactivate them using your browser's cookie settings.
Only the "SC_ANALYTICS_GLOBAL_COOKIE" may store personal details (your IP address). SUEZ uses this cookie to analyse your browsing and measure the website's audience. The button below allows you to deactivate or reactivate this cookie at any time.