Views: 3 Author: Site Editor Publish Time: 2020-06-11 Origin: Site
With the improvement of wastewater discharge standard and the reduction of membrane cost and energy consumption, MBR technology has entered a high-speed development period in wastewater treatment due to its advantages of excellent effluent quality, direct reuse and land saving. The action plan is about to come out for controlling of water pollution, which will leverage the investment of 2 trillion RMB in water market. The market fundamentals may be greatly improved. As the fastest-growing technology, membrane bioreactor (MBR) will undoubtedly bring great development opportunities. At the same time, large-scale MBRapplication is just starting in urban sewage treatment, and it is necessary to summarize the key technologies of MBR process biochemical system design for urban sewage treatment project, which based on the existing urban sewage MBR system, combined with the relevant engineering experience, and the successful cases and technical specifications at home and abroad.
1. Classification of membrane bioreactor (MBR) process systems
According to the relative position of biochemical system and membrane separation system, MBR can be divided into two types: Separated MBR and Integrated MBR.
Separated MBR is to place membrane components in a separate membrane tank outside the biochemical system, which is characterized by clear grouping of membrane components, good operation environment, and easy to operate independently, clean and repair. Integrated MBR is to place membrane components directly in biochemical system, which is characterized by saving land occupation. But it is not conducive to the grouping of membrane components and the laying of supporting pipelines.
2. Selection of MBR process system
For urban sewage treatment projects, due to the large scale, the operation environment of membrane components, sludge concentration control, the requirements for nitrogen and phosphorus removal, and energy consumption reduction requirements, negative pressure suction immersion MBR process is generally adopted.
