Large-scale sewage treatment plant equipment engineering projects:

Project approval--basic investigation and demonstration--feasibility study report--engineering design--engineering construction--engineering commissioning and acceptance--project operation management

Small sewage treatment plant equipment engineering projects (many factories and enterprises):

Environmental Impact Assessment--Program Design--Engineering Design--Project Bidding--Project Construction--Project Acceptance--Project Commissioning and Trial Operation--Environmental Protection Acceptance--Operation and Operation Management--Monitoring and Monitoring