Institute of Food Technology and Bioprocess Engineering, TU Dresden, Bergstraße 120, 01062 Dresden, Germany.
Bioprocess Biosyst Eng. 2011 Mar;34(3):287-95. doi: 10.1007/s00449-010-0470-2. Epub 2010 Sep 26.
Modelling of activated sludge processes is a commonly used technique to design and optimize wastewater treatment processes. Since wastewater and activated sludge is characterized by chemical oxygen demand (COD) measurements, units of state variables describing organic matter are expressed as equivalent amounts of COD. However, current procedures for measuring it have several drawbacks, including the production of hazardous wastes, so the utility of other variables for characterizing the organic load in modelling, such as total organic carbon (TOC), warrant re-evaluation. Other advantages of TOC over COD are that it provides matrix-independent analytical results and it can be readily measured online. Proposals for TOC-based models were made in the 1990s, but they seem to have sunk into obscurity. To re-assess the value of TOC for this purpose, we have recalculated the EAWAG module for Bio-P removal coupled to the Activated Sludge Model No. 3 on a TOC basis, and tested it against data acquired in batch experiments with four single carbon sources (acetate, glucose, citrate and casein). The batch test-based calibrations showed a good match with experimental data, following modifications of the model to account for the anaerobic volumes and retention times applied in the tests.
活性污泥工艺建模是设计和优化废水处理工艺的常用技术。由于废水和活性污泥的特点是化学需氧量（COD）测量，因此描述有机物的状态变量的单位表示为等效的 COD 量。然而，目前的 COD 测量方法存在几个缺点，包括产生危险废物，因此需要重新评估其他变量（如总有机碳（TOC））在建模中描述有机负荷的效用。TOC 相对于 COD 的其他优点是它提供了与基质无关的分析结果，并且可以在线进行测量。20 世纪 90 年代就提出了基于 TOC 的模型的建议，但它们似乎已经消失了。为了重新评估 TOC 在这方面的价值，我们重新基于 TOC 计算了与活性污泥模型 No.3 耦合的生物磷去除的 EAWAG 模块，并将其与通过四种单碳源（乙酸盐、葡萄糖、柠檬酸盐和酪蛋白）进行的批实验数据进行了测试。在对模型进行了修改以考虑到测试中应用的厌氧体积和停留时间之后，基于批实验的校准与实验数据很好地吻合。
