Verified Certificate

Supported by the following organizations

This is to certify that Usoa Perez Ruiz successfully completed and received a passing grade in 40050455.2x: Water and Wastewater Treatment Engineering: Biochemical Technology | 水处理工程：生物化学方法 a course of study offered by TsinghuaX, an online learning initiative of Tsinghua University.

Noted by

Jian'e Zuo

Jian'e Zuo

Professor, School of Environment Tsinghua University

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An edX Verified Certificate signifies that the learner has agreed to abide by the edX honor code and completed all of the required tasks of this course under its guidelines, as well as having their photo ID checked to verify their identity.