Almomani Fares, Bohsale Rahul R
Department of Chemical Engineering, College of Engineering, Qatar University, P. O. Box 2713, Doha, Qatar.
Department of Chemical Engineering, College of Engineering, Qatar University, P. O. Box 2713, Doha, Qatar.
Bioresour Technol. 2020 Jun;305:123059. doi: 10.1016/j.biortech.2020.123059. Epub 2020 Feb 20.
The potential of 3-stages process (anaerobic, anoxic and moving bed biofilm reactor (MBBR)) for organic matter and nutrient removals from secondary WWTP effluents at various hydraulic retention time (HRT) and nitrate recycle ratio (R) was investigated. Percentage removals of total nitrogen (%TN) and phosphorous (%TP) were optimized using response surface methodology (RSM). Under optimized conditions (HRT = 12.8 hr and R = 1.5) significant chemical oxygen demand removal (%COD), %TN and %TP of 95.5%, 96.2%, 94.70% were attained. The MMBR effectively reduced organic matter and nutrient under low HRT and R. %TN was improved by increasing the HRT up to 1.5 h at R ≤ 2. Bio-uptake of phosphorus and nitrate is controlled by release of secondary phosphorous. Reactors demonstrated stable biofilm characteristics except for a slight decrease in biofilm thickness due to flow-shear stress. The 3-stages process performed four times higher than suspended growth process and similar to 5-stage Bardenpho-MBBR.
研究了三阶段工艺（厌氧、缺氧和移动床生物膜反应器（MBBR））在不同水力停留时间（HRT）和硝酸盐循环比（R）下从二级污水处理厂出水中去除有机物和营养物的潜力。使用响应面法（RSM）优化了总氮去除率（%TN）和磷去除率（%TP）。在优化条件下（HRT = 12.8小时，R = 1.5），化学需氧量去除率（%COD）、%TN和%TP分别达到了95.5%、96.2%、94.70%。MMBR在低HRT和R条件下能有效降低有机物和营养物含量。在R≤2时，将HRT延长至1.5小时可提高%TN。磷和硝酸盐的生物吸收受二级磷释放的控制。除了由于水流剪切应力导致生物膜厚度略有下降外，反应器表现出稳定的生物膜特性。三阶段工艺的处理效果比悬浮生长工艺高四倍，与五阶段巴登福 - MBBR工艺相似。
