Department of Electrical Engineering, Electronics & Automation, University of Extremadura, Avda. Elvas s/n, 06006 Badajoz, Spain.
Bioresour Technol. 2012 Jun;114:160-7. doi: 10.1016/j.biortech.2012.03.039. Epub 2012 Mar 21.
Changes in the oxidation-reduction potential (ORP), pH and dissolved oxygen (DO), along with organic load and nutrient removal in a municipal wastewater treatment plant (WWTP) have been monitored throughout one year. The "nitrate knee" and the "nitrate break point" in ORP profiles, the "nitrate apex" and the "ammonia valley" in pH profiles and the "DO elbow" in DO profiles have been identified. Furthermore, these bending points have been correlated with the oxygen uptake rate (OUR), the temperature in the vessel and the aeration and non-aeration time profiles by using Principal Component Analysis (PCA). The data have been previously split up into wet and dry weather cycles by means of a K-means clustering algorithm. Finally, two new parameters have been defined: the "ORP Arrow", which is closely related to the inhibition of the denitrification process, and the "Oxygen Rise Average Slope" (ORAS), which shows the oxygen transfer rate.
在一年的时间里，监测了城市污水处理厂（WWTP）中氧化还原电位（ORP）、pH 值和溶解氧（DO）的变化，以及有机负荷和营养物质的去除情况。在 ORP 曲线中确定了“硝酸盐拐点”和“硝酸盐突破点”，在 pH 曲线中确定了“硝酸盐顶点”和“氨谷”，在 DO 曲线中确定了“DO 肘”。此外，通过使用主成分分析（PCA），将这些弯曲点与耗氧速率（OUR）、容器内温度以及曝气和非曝气时间曲线相关联。通过 K-均值聚类算法，将数据先前划分为湿天气和干天气周期。最后，定义了两个新参数：与反硝化过程抑制密切相关的“ORP 箭头”和表示氧气转移速率的“氧气上升平均斜率”（ORAS）。
