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.
振动MBR系统关键运行参数优选与验证
- Title:
- Optimization of Key Operating Parameters of Vibrating MBR System and Its Verification
- Keywords:
- MBR; vibration; membrane fouling; energy consumption; critical flux
- 摘要:
- MBR技术通常采用膜面曝气吹扫方式控制膜污染，导致运行能耗较高。以机械振动方式代替曝气吹扫具有抗污染效果好、能耗低的突出优势，实用价值和研究意义较高。采用通量阶梯递增法测定了不同参数条件下振动MBR临界通量，确定最优产水开停比为7∶1，在此基础上建立了包含振频、振幅、污泥浓度和回流比等因素的临界通量模型。结合膜振动理论能耗计算，优选膜系统关键运行参数如下：振频为0.4~0.6 Hz、振幅为4~6 cm、污泥浓度为10~16 g/L、回流比为100%~300%。以实际城镇污水为进水，对优选参数进行了中试验证，并与曝气MBR工程进行对比。振动MBR中试装置的运行跨膜压差（TMP）低于10 kPa，单个清洗周期内TMP增长速率的均值为0.1 kPa/d，振动能耗均值为0.066 kW·h/m3。与曝气MBR相比，振动MBR的TMP平均增长速率降低86%，膜系统节能57%，是一种特色鲜明、应用前景良好的新型MBR技术。
- 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.
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