MBR工艺在污水处理厂提标扩建工程中的应用与优化建议

丹江口某污水处理厂提标扩建工程设计规模为3.0×104 m3/d,出水水质主要指标执行GB 3838—2002《地表水环境质量标准》Ⅳ类,其中ρ(TN)≤15 mg/L。二级处理单元采用A2/O+MBR工艺,处理效果良好,达到设计目标。结合本工程MBR膜池及设备间的设计,介绍了BIM(建筑信息模型)技术在MBR工艺设计中的应用,并根据分析结果对设计中潜在的问题给出优化建议。同时,针对现场实际运行中暴露的问题提出解决方法,如设备布置与起吊、污泥沉降与曝气、回流泵的汽蚀防护等,为其他类似工程提供参考。

APPLICATION OF MBR PROCESS IN UPGRADING AND EXTENSION OF WASTEWATER TREATMENT PLANT AND OPTIMIZATING PROPOSALS

The design capacity of the upgrading and extension of a wastewater treatment plant(WWTP) from Danjiangkou was 3.0×104 m3/d. Main indicators of the effluent quality met the class Ⅳ criteria in Environmental Quality Standard for Surface Water and TN concentration was less than 15 mg/L. A2/O(anaerobic/anoxic/oxic process)+MBR(membrane bioreactor) combined process served as the secondary treatment and realized the designed target with good treatment performance. The application of BIM(building information modeling) technology was introduced in combination with the design of MBR process, and the optimization proposal to the potential problems was provided based on the analysis results. Meanwhile, the solutions to some problems exposed during the practical operation were presented as well, such as the layout and lifting of the devices, sludge sedimentation and aeration, cavitation projection of reflux pumps, which could provide reference for the similar projects.