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組合工藝各工段設計要點
- Title:
- Key Points for Each Section Design of AAO and MBR Combined Process
- Keywords:
- AAO; MBR; key points of design
摘要:- 隨著各地污水處理廠排放標準的日趨嚴格，工藝流程短、出水效果好的AAO+MBR組合工藝得以快速普及，尤其對于用地面積緊張、
景觀環境要求高的地下式污水處理廠，其更受青睞。然而AAO+MBR組合工藝并非是傳統AAO和新型膜技術的簡單疊加，其預處理、AAO、MBR等單元的設計與傳統AAO均存在明顯區別。結合國內眾多工程案例，詳細分析了AAO+MBR組合工藝的設計要點，如預處理工段需根據進水水質選擇設置初沉池，同時應設置膜格柵以避免纖維、毛發等造成膜絲纏繞；AAO工段的特殊性在于三級回流比的確定、AAO各區設計污泥濃度的計算、AAO+MBR各區實際流量的計算、需氧量的計算以及強化脫氮措施的設計等；MBR工段的特殊性在于膜通量計算、膜區設計污泥濃度的確定、產水泵流量和揚程的計算、膜區底部吹掃設計以及膜清洗設計等。
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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