HUANGJiang-long,GUANHuan-huan,LIUJiang-hui,et al.Optimization of Key Operating Parameters of Vibrating MBR System and Its Verification[J].China Water & Wastewater,2023,39(17):88-92.
Optimization of Key Operating Parameters of Vibrating MBR System and Its Verification
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第17期
Page:
88-92
Column:
Date of publication:
2023-09-01
- Keywords:
- MBR; vibration; membrane fouling; energy consumption; critical flux
- Abstract:
- MBR technology usually adopts air scouring method to control membrane fouling, which leads to high energy consumption in operation. The mechanical vibration method instead of air scouring has the outstanding advantages of good anti-fouling performance and low energy consumption, and has high practical value and research significance. The critical flux of vibrating MBR with different operating parameters was measured by flux step-up method, and the optimal flux on/off ratio of water production was determined to be 7 ∶1. On this basis, the critical flux model including vibration frequency, amplitude, sludge concentration and reflux ratio was established. Combined with the theoretical energy consumption calculation of vibrating membrane, the key operating parameters of the membrane system were optimized as follows: vibration frequency was 0.4-0.6 Hz, amplitude was 4-6 cm, sludge concentration was 10-16 g/L, and reflux ratio was 100%-300%. The optimized parameters were verified in a pilot-scale vibrating MBR with actual municipal wastewater as influent, and the results were compared with aerated MBR. The transmembrane pressure (TMP) of the pilot-scale vibrating MBR was less than 10 kPa, the average TMP growth rate in a single cleaning cycle was 0.1 kPa/d, and the average vibration energy consumption was 0.066 kW·h/m3. Compared with aerated MBR, the average TMP growth rate of vibrating MBR was reduced by 86%, and the membrane system saved 57% of energy consumption, indicating that it was a new MBR technology with distinct characteristics and good application prospect.
Last Update:
2023-09-01