TIANHai-cheng,YANGHong-hong,JIAOWen-hai,et al.Key Points for Each Section Design of AAO and MBR Combined Process[J].China Water & Wastewater,2023,39(6):71-77.
AAO+MBR组合工艺各工段设计要点
- Title:
- Key Points for Each Section Design of AAO and MBR Combined Process
- Keywords:
- AAO; MBR; key points of design
- 摘要:
- 随着各地污水处理厂排放标准的日趋严格，工艺流程短、出水效果好的AAO+MBR组合工艺得以快速普及，尤其对于用地面积紧张、景观环境要求高的地下式污水处理厂，其更受青睐。然而AAO+MBR组合工艺并非是传统AAO和新型膜技术的简单叠加，其预处理、AAO、MBR等单元的设计与传统AAO均存在明显区别。结合国内众多工程案例，详细分析了AAO+MBR组合工艺的设计要点，如预处理工段需根据进水水质选择设置初沉池，同时应设置膜格栅以避免纤维、毛发等造成膜丝缠绕；AAO工段的特殊性在于三级回流比的确定、AAO各区设计污泥浓度的计算、AAO+MBR各区实际流量的计算、需氧量的计算以及强化脱氮措施的设计等；MBR工段的特殊性在于膜通量计算、膜区设计污泥浓度的确定、产水泵流量和扬程的计算、膜区底部吹扫设计以及膜清洗设计等。
- Abstract:
- With the increasingly stringent discharge standards of sewage treatment plants in China, the AAO and MBR combined process with short process flow and good effluent quality has been rapidly popularized, especially for underground sewage treatment plants with limited footprint area and high landscape environment requirements. However, the combined process is not a simple superposition of traditional AAO and new membrane technology, and the design of pretreatment, AAO, MBR and other units are obviously different from that of traditional AAO. Based on many domestic engineering cases, this paper analyzed the design points of AAO and MBR combined process in detail. For example, a primary sedimentation tank should be set according to the influent quality in the pretreatment section, and an ultrafine screen should be set to avoid the filament entanglement caused by fiber and hair. The particularity of AAO section lay in the determination of the three-stage reflux ratio, the calculation of the designed sludge concentration in each AAO section, the calculation of the actual flow of each section of AAO/MBR, the calculation of oxygen demand and the design of enhanced denitrification measures. The particularity of MBR section lay in the calculation of membrane flux, the determination of designed sludge concentration in membrane area, the calculation of pump flow and head, the design of the membrane air souring structure at the bottom of membrane area and the design of membrane cleaning method.
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