摘要
具有脱氮除磷功能的膜生物反应器(MBNR)本质上与传统的脱氮除磷活性污泥工艺(CBNR)相同,且工艺设计原理差别不大。然而,与传统CBNR工艺相比,MBNR工艺的设计必须考虑由于回流(污泥和混合液)和污水流量变化造成的污泥混合液浓度在不同反应器中的差别,以及不同反应器中MLSS分布的变化,其目的是保证系统运行中污泥在厌氧池、缺氧池和好氧池的合理分配。另外,由于污水流量的变化将导致反应器中污泥浓度随时间而变化,因此有必要进行工艺的动态性能分析。在MBNR工艺系统中,污泥混合液浓度高时曝气效率降低,不同的回流分配将导致膜池前端反应器中污泥浓度的变化,因此评价曝气效率和工艺容积之间的平衡很重要。
The membrane biological nutrient removal （MBNR） process is essentially the same as in conventional biological nutrient removal （CBNR） process, and the process design principles are no different. However, compared with CBNR process, the design of MBNR process must account for differences in MLSS between reactors due to recycle flows of sludge and mixed liquor and change in wastewater flow, and the variation of MLSS distribution in reactors, with a view to ensuring reasonable distribution of sludge in anaerobic, anoxic and aerobic zones. Also, the analysis of dynamic behaviour is important due to time-varying sludge concentrations under wastewater flow patterns. The aeration efficiency is reduced at the higher MLSS concentrations that can be achieved in MBNR process. Evaluating the balance between aeration efficiency and process volume requirements is important for different recycle arrangements resulting in lower/higher MLSS upstream of the membrane tank.
出处
《中国给水排水》
CAS
CSCD
北大核心
2010年第22期18-22,共5页
China Water & Wastewater
关键词
膜生物反应器
脱氮除磷
化学除磷
模拟
工艺设计
优化运行
MBR
nitrogen and phosphorus removal
chemical phosphorus removal
simulation
technological design
operation optimization
