SUNXian-peng,MENGXue,LIUXu-yang,et al.Optimization for Uneven Water Distribution in MBBR with High Width-Length Ratio Based on Practical Engineering[J].China Water & Wastewater,2024,40(9):1-7.
高宽长比MBBR配水不均的运行优化工程实践
- Title:
- Optimization for Uneven Water Distribution in MBBR with High Width-Length Ratio Based on Practical Engineering
- Keywords:
- moving bed biofilm reactor (MBBR); hight width-length ratio; short circuit; aeration distribution; tracer
- 摘要:
- 高宽长比移动床膜生物反应器（MBBR）的出水口与进水配水渠距离较近，易产生配水不均问题，造成短流现象，从而影响工艺处理效率。为充分发挥该MBBR的高效处理能力，以青岛市某污水厂宽长比为2.3∶1的MBBR为研究对象，通过采取调整内回流比、封堵部分出水口、调整曝气系统运行工况、降低液位使配水渠形成跌水等措施，在确保系统氧转移效率的同时，缓解了MBBR内短流现象，并通过水质测试和示踪试验进行了验证。在常规运行条件（内回流比为200%、外回流比为100%）下，MBBR的出水氨氮浓度逐渐升高，示踪试验结果证实系统内存在短流现象。当保持外回流比不变、内回流比改为100%和300%时，尽管短流现象有所改善，但综合考虑处理效果和运行能耗等因素，这两种工况均不可取。采用封堵部分出水口和调整曝气系统运行工况的解决方案后，MBBR出水横断面的氧转移效率差距减小，但进水氧转移效率差距增加，因此进一步增加降低液位使配水渠形成跌水措施来保障配水渠进水均匀性。经示踪试验验证，所采用的工艺优化措施解决了进出水配水不均问题，有效缓解了MBBR在常规运行工况下的出水短流现象。
- Abstract:
- The outlet of moving bed biofilm reactor (MBBR) with high width-length ratio is closely located to the inflow distribution channel, which leads to uneven distribution of inflow and outflow, resulting in a short circuit phenomenon, thereby affecting the pollutants removal. To fully utilize the treatment capability of the MBBR, this study focused on a MBBR with width-length ratio of 2.3∶1 in a wastewater treatment plant in Qingdao. Measures such as adjusting the internal reflux ratio, partially blocking the outlet, altering the operating conditions of the aeration system, and lowering the water level to form a waterfall in the distribution channel were implemented. These measures, while ensuring the oxygen transfer efficiency of the system, alleviated the short circuit phenomenon within the MBBR. The effectiveness of these measures was verified through water quality tests and tracer experiments. The results showed that under conventional operating conditions (200% internal reflux, 100% external reflux), the effluent ammonia nitrogen concentration in the MBBR gradually increased. Tracer test results confirmed the presence of a short circuit phenomenon within the system. When the external reflux ratio was kept constant and the internal reflux ratio was adjusted to 100% and 300%, the short circuit phenomenon within the MBBR improved. However,considering factors such as treatment effectiveness and operational energy consumption, neither of these conditions was recommended for use. After implementing the solution of partially blocking the outlet and adjusting the operating conditions of the aeration system, the difference in the oxygen transfer efficiency between the inlet and outlet cross-sections of the MBBR decreased,but that of the inflow increased. Therefore, the measure of further lowering the water level to form a waterfall in the distribution channel was introduced to ensure the uniformity of inflow. Tracer experiments confirmed that the process optimization measures effectively mitigated the short circuit phenomenon of the effluent under conventional operating conditions by addressing the issue of uneven distribution of inflow and outflow.
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