Department of Environmental Engineering, Suleyman Demirel University, Isparta 32260, Turkey.
Water Sci Technol. 2010;61(3):659-69. doi: 10.2166/wst.2010.869.
The main objective of this work was to investigate the filterability of MBR sludge and its mixture with conventional activated sludge (CAS). In addition, the impacts of type and dose of various polyelectrolytes, filter type and sludge properties on the filterability of both MBR and Mixed sludges were determined. Specific cake resistance (SCR) measured by the Buchner funnel filtration test apparatus and the solids content of the resulting sludge cake were used to assess the dewaterability of tested sludges. The type of filter paper used in Buchner tests affected the results of filterability for MBR, CAS and Mixed sludges. SCR values and optimum polyelectrolyte doses increased with increasing MLSS concentrations in the MBR, which suggested that increase in MLSS concentrations accompanied by increases in EPS and SMP concentrations and a shift toward smaller particles caused poorer dewaterability of the MBR sludge. The significant differences observed among the filterability of CAS and MBR sludges suggested that MLSS alone is not a good predictor of sludge dewaterability. Combining CAS and MBR sludges at different proportions generally improved their dewaterability. Combining MBR sludges having typically high MLSS and EPS concentrations with CAS having much lower MLSS concentrations may be an option for full-scale treatment plants experiencing sludge dewaterability problems. Better filterability and higher cake dry solids were achieved with cationic polyelectrolytes compared to anionic and non-ionic ones for all sludge types tested.
这项工作的主要目的是研究 MBR 污泥及其与传统活性污泥（CAS）混合物的过滤性能。此外，还确定了各种类型和剂量的聚电解质、过滤类型和污泥特性对 MBR 和混合污泥过滤性能的影响。通过布氏漏斗过滤试验装置测量的比滤饼阻力（SCR）和所得污泥饼的固体含量用于评估测试污泥的脱水性能。布氏漏斗试验中使用的滤纸类型会影响 MBR、CAS 和混合污泥的过滤性能结果。SCR 值和最佳聚电解质剂量随着 MBR 中 MLSS 浓度的增加而增加，这表明 MLSS 浓度的增加伴随着 EPS 和 SMP 浓度的增加以及较小颗粒的转移，导致 MBR 污泥的脱水性能变差。CAS 和 MBR 污泥过滤性能之间观察到的显著差异表明，MLSS 本身并不是污泥脱水性能的良好预测指标。将 CAS 和 MBR 污泥以不同比例混合通常可以改善其脱水性能。将 MLSS 和 EPS 浓度通常较高的 MBR 污泥与 MLSS 浓度低得多的 CAS 混合，可能是解决全规模处理厂污泥脱水性能问题的一种选择。与所有测试的污泥类型相比，阳离子聚电解质的过滤性能更好，饼干燥固体含量更高。
