Double-whammy sludge treatment contract for Cambi in Beijing

Beijing Drainage Construction Company has awarded a second contract for the use of Thermal Hydrolysis Process (THP), following an initial contract awarded in September...

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Beijing Drainage Construction Company has awarded a second contract for the use of Thermal Hydrolysis Process (THP), following an initial contract awarded in September.

The contract at Xiaohongmen Wastewater Treatment Plant (WWTP) follows the recent contract award to Cambi for Gaobeidian WWTP, Beijing’s largest (see WWi article).

Serving two million people, Xiaoghongmen is Beijing’s second largest wastewater treatment plant and is owned and operated by the Beijing Drainage Group.

Beijing Drainage Group will use the THP process to upgrade the Xiaohongmen WWTP’s five large egg-shaped digesters to advanced sludge treatment. The digesters are currently used to treat primary sludge only, with the secondary sludge treated by lime stabilization.

Now the full sludge amount will be treated in Cambi THP with subsequent advanced digestion in the existing digesters. The final dewatered cake will be used for land application.

The surplus biogas produced will be used in the digestion project for heat and green electricity for use in the WWTP plant.

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