Cemagref, UR HBAN, Parc de Tourvoie, BP 44, F-92163 Antony Cedex, France.
Water Sci Technol. 2010;62(3):630-9. doi: 10.2166/wst.2010.341.
The first objective of this work was to evaluate the ability of the long-term BOD tests to provide the total biodegradable COD (BCOD) for domestic wastewaters. Results show that the method is repeatable (using two different volume samples, 97 and 164 mL) and that the fractions of BCOD determined were not statistically different from the one obtained by respirometry (at low S/X ratio). Respirometric tests were also repeatable. They were shown to be sensitive to the origin of the sludge. The results obtained are in the range of literature data. But they later indicated that long-term bioassays (>20 days) give higher biodegradable fractions than the other methods (BOD and respirometry). The second objective was to compare soluble fractions obtained with raw and pre-flocculated samples. Flocculated filtered COD is significantly lower than filtered COD, even if a pore size of 0.1 microm is used. The comparison to literature values shows that physicochemical RBCOD fractions are significantly higher than the ones obtained using bioassays. Comparison with the fractions used in calibrated models would help the choice of the more suitable method for modelling purposes.
这项工作的首要目标是评估长期 BOD 测试对生活污水总可生物降解 COD（BCOD）的测定能力。结果表明，该方法具有可重复性（使用两种不同体积的样品，97 和 164mL），并且通过呼吸计法（在低 S/X 比时）测定的 BCOD 分数与呼吸计法没有统计学差异。呼吸计测试也具有可重复性。研究表明，呼吸计测试对污泥的来源敏感。获得的结果在文献数据范围内。但随后表明，长期生物测定（>20 天）比其他方法（BOD 和呼吸计法）给出更高的可生物降解分数。第二个目标是比较原样品和预絮凝样品的可溶分数。即使使用孔径为 0.1 微米的过滤器，絮凝过滤的 COD 也明显低于过滤 COD。与文献值的比较表明，物理化学 RBCOD 分数明显高于通过生物测定获得的分数。与校准模型中使用的分数进行比较将有助于为建模目的选择更合适的方法。
