NSERC Chair in Water Treatment, University of Waterloo, 200 University Ave West Waterloo, ON N2L 3G1, Canada.
NSERC Chair in Water Treatment, University of Waterloo, 200 University Ave West Waterloo, ON N2L 3G1, Canada.
Water Res. 2015 Mar 1;70:224-34. doi: 10.1016/j.watres.2014.11.047. Epub 2014 Dec 5.
The focus of this full-scale study was to determine the effect of ozone on biopolymer concentrations in biofiltration and ultrafiltration (UF) processes treating surface water from Lake Ontario. Ozonation was out of service for maintenance for 9 months, hence, it was possible to investigate ozone's action on biologically active carbon contactors (BACCs) and UF, in terms of biopolymer removal. Given the importance of biopolymers for fouling, this fraction was quantified using a chromatographic technique. Ozone pre-treatment was observed to positively impact the active biomass in biofilters. However, since an increase of the active biomass did not result in higher biopolymer removal, active biomass concentration cannot be a surrogate for biofiltration performance. It was evident that increasing empty bed contact time (EBCT) from 4 to 19 min only had a positive effect on biopolymer removal through BACCs when ozone was out of service. However, as a mass balance experiment showed, ozone-free operation resulted in higher deposition of biopolymers on a UF membrane and slight deterioration in its performance.
本全面研究的重点是确定臭氧对处理安大略湖地表水的生物过滤和超滤（UF）工艺中生物聚合物浓度的影响。由于需要进行维护，臭氧系统已停用 9 个月，因此，有可能研究臭氧对生物活性炭接触器（BACCs）和 UF 的作用，以去除生物聚合物。鉴于生物聚合物对结垢的重要性，使用色谱技术对该部分进行了定量。臭氧预处理被观察到对生物过滤器中的活性生物量有积极影响。然而，由于活性生物量的增加并没有导致更高的生物聚合物去除率，因此活性生物量浓度不能作为生物过滤性能的替代指标。显然，当臭氧系统停用时，将空床接触时间（EBCT）从 4 分钟增加到 19 分钟仅对 BACCs 中的生物聚合物去除有积极影响。然而，正如质量平衡实验所示，无臭氧操作会导致更多的生物聚合物在 UF 膜上沉积，并使其性能略有恶化。
