State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Institute of Energy, Jiangxi Academy of Sciences, Nanchang 330096, Jiangxi Province, China.
Bioresour Technol. 2016 Mar;203:62-70. doi: 10.1016/j.biortech.2015.12.010. Epub 2015 Dec 17.
Control of organic loading rate (OLR) is essential for anaerobic digestion treating high COD wastewater, which would cause operation failure by overload or less efficiency by underload. A novel biogas-pH automation control strategy using the combined gas-liquor phase monitoring was developed for an anaerobic membrane bioreactor (AnMBR) treating high COD (27.53 g·L(-1)) starch wastewater. The biogas-pH strategy was proceeded with threshold between biogas production rate >98 Nml·h(-1) preventing overload and pH>7.4 preventing underload, which were determined by methane production kinetics and pH titration of methanogenesis slurry, respectively. The OLR and the effluent COD were doubled as 11.81 kgCOD·kgVSS(-1)·d(-1) and halved as 253.4 mg·L(-1), respectively, comparing with a constant OLR control strategy. Meanwhile COD removal rate, biogas yield and methane concentration were synchronously improved to 99.1%, 312 Nml·gCODin(-1) and 74%, respectively. Using the biogas-pH strategy, AnMBR formed a "pH self-regulation ternary buffer system" which seizes carbon dioxide and hence provides sufficient buffering capacity.
控制有机负荷率（OLR）对于处理高 COD 废水的厌氧消化至关重要，过高的负荷或过低的负荷都会导致运行失败。针对处理高 COD（27.53 g·L（-1））淀粉废水的厌氧膜生物反应器（AnMBR），开发了一种新型的沼气-pH 自动化控制策略，该策略结合了气液相间监测。沼气-pH 策略的阈值为沼气产率>98 Nml·h（-1）以防止过载和 pH>7.4 以防止欠载，这分别由甲烷生产动力学和沼气生成泥浆的 pH 滴定确定。OLR 和出水 COD 分别提高了一倍，达到 11.81 kgCOD·kgVSS（-1）·d（-1）和减半，达到 253.4 mg·L（-1），与恒 OLR 控制策略相比。同时，COD 去除率、沼气产率和甲烷浓度分别提高到 99.1%、312 Nml·gCODin（-1）和 74%。使用沼气-pH 策略，AnMBR 形成了“pH 自调节三元缓冲系统”，该系统可以捕获二氧化碳，并因此提供足够的缓冲能力。
