铝离子对低温好氧颗粒污泥颗粒化的强化作用

Enhanced Granulation of Aerobic Granular Sludge by Al3+ Augmentation at Low Temperature

摘要:

研究了低温条件下Al3+对好氧颗粒污泥颗粒化的强化作用.在Al3+质量浓度为30.0 mg·L-1条件下，经强化颗粒化作用的好氧颗粒污泥仅需40 d即可以培养成熟，其表面光滑，结构紧密，具有较好的沉淀性能和较高的生物量.培养成熟的低温好氧颗粒污泥对污水具有较高的处理效能，COD，NH4+ N和PO3-4 P去除率分别达到85.6%，88.8%和91.9%，较好地实现了碳氮磷的低温高效同步去除.低温好氧颗粒污泥形成过程中，胞外聚合物中蛋白质类的质量分数明显升高，达到9.25 mg·g-1，蛋白质类与多糖类的质量比（PN/PS）为1.10，说明较高含量的蛋白质类是好氧颗粒污泥形成的重要因素.同时，加入30 mg·L-1Al3+后，污泥zeta电位从-18.40 mV逐渐升高到-6.51 mV，表明污泥之间静电斥力减小有利于污泥聚集，形成颗粒.

Abstract:

A study was made of the enhanced granulation of aerobic granular sludge (AGS) by Al 3+ augmentation at low temperature. Rapid granulation was achieved since AGS formation time significantly decreased from 73 days to 40 days by adding 30.0 mg·L-1Al3+ at low temperature in a sequencing batch airlift reactor (SBAR). AGS with clear surface and compact structure possessed better settling property, higher biomass, and better simultaneously COD, NH4+ N and PO3-4 P removal efficiency, the respective removal rates were 85.6%, 88.8% and 91.9%. Compared with the conventional cultivation of AGS, the content of total protein was as high as 9.25 mg·g-1 and the total proteins to the total polysaccharide(PN/PS) ratio was 1.10, and the relatively high protein content presented an essential feature for AGS formation. In addition, zeta potential increased from -18.40 mV to -6.51 mV when AGS became mature by adding 30.0 mg·L-1 of Al3+, the higher zeta potential indicated the reduction of electrostatic repulsion was beneficial for granules aggregated.