Research Center for Low Carbon Technology of Water Environment, School of Environment and Natural Resource, Renmin University of China, Beijing, 100872, China.
Sci Rep. 2021 Jan 12;11(1):691. doi: 10.1038/s41598-020-80700-8.
Wastewater characterization is the basis for process design and operation optimization of wastewater treatment plants (WWTPs). In this work, a comprehensive study of the respirometry method has been performed to evaluate the biodegradable organic matters of wastewater. First, the optimal initial substrate to biomass ratio (S/X) was confirmed. Second, under the optimal S/X, the degradation curves of wastewater carbon oxygen demand (COD) components rapidly biodegradable COD (RBCOD) and slowly biodegradable COD (SBCOD) were obtained. Third, the Mann-Kendall test was performed to confirm the time point (t) when endogenous respiration levels were reached, and the hydrolysis model was used to determine the time point (t) of the SBCOD degradation stage. Considering the results, an adequate wastewater COD characterization method for RBCOD and SBCOD has been proposed. This study provides strong support to carry out effective and feasible process design, process diagnosis and optimization capability, can help achieve refined and stable operational management of WWTPs.
废水特性分析是污水处理厂（WWTP）工艺设计和运行优化的基础。在这项工作中，对呼吸测量法进行了全面研究，以评估废水的可生物降解有机物。首先，确定了最佳初始基质与生物质比（S/X）。其次，在最佳 S/X 下，获得了废水化学需氧量（COD）成分的降解曲线，即快速生物降解 COD（RBCOD）和慢速生物降解 COD（SBCOD）。第三，进行了曼肯德尔检验以确认达到内源呼吸水平的时间点（t），并使用水解模型确定 SBCOD 降解阶段的时间点（t）。考虑到这些结果，提出了一种用于 RBCOD 和 SBCOD 的充分的废水 COD 特性分析方法。本研究为进行有效且可行的工艺设计、工艺诊断和优化能力提供了有力支持，有助于实现污水处理厂的精细化和稳定化运行管理。
