Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze Ed. 8, 90128, Palermo, Italy.
Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze Ed. 8, 90128, Palermo, Italy.
Water Res. 2019 Jan 1;148:425-437. doi: 10.1016/j.watres.2018.10.086. Epub 2018 Oct 30.
Biological nutrient removal performances and kinetics of autochthonous marine biomass in forms of activated sludge and aerobic granular sludge were investigated under different salinity and sludge retention time (SRT). Both the biomasses, cultivated from a fish-canning wastewater, were subjected to stepwise increases in salinity (+2 gNaCl L), from 30 gNaCl L up to 50 gNaCl L with the aim to evaluate the maximum potential in withstanding salinity by the autochthonous marine biomass. Microbial marine species belonging to the genus of Cryomorphaceae and of Rhodobacteraceae were found dominant in both the systems at the maximum salinity tested (50 gNaCl L). The organic carbon was removed with a yield of approximately 98%, irrespective of the salinity. Similarly, nitrogen removal occurred via nitritation-denitritation and was not affected by salinity. The ammonium utilization rate and the nitrite utilization rate were approximately of 3.60 mgNH-N gVSSh and 10.0 mgNO-N gVSSh, respectively, indicating a high activity of nitrifying and denitrifying bacteria. The granulation process did not provide significant improvements in the nutrients removal process likely due to the stepwise salinity increase strategy. Biomass activity and performances resulted affected by long SRT (27 days) due to salt accumulation within the activated sludge flocs and granules. In contrast, a lower SRT (14 days) favoured the discharge of the granules and flocs with higher inert content, thereby enhancing the biomass renewing. The obtained results demonstrated that the use of autochthonous-halophilic bacteria represents a valuable solution for the treatment of high-strength carbon and nitrogen saline wastewater in a wide range of salinity. Besides, the stepwise increase in salinity and the operation at low SRT enabled high metabolic activity and to avoid excessive accumulation of salt within the biomass aggregates, limiting their physical destructuration due to the increase in loosely-bound exopolymers.
采用逐步提高盐度（从 30 gNaCl L 提高到 50 gNaCl L）的方法，研究了以活性污泥和好氧颗粒污泥形式存在的本土海洋生物量在不同盐度和污泥停留时间（SRT）下的生物营养去除性能和动力学。两种生物量均由鱼罐头废水培养而成，旨在评估本土海洋生物量耐受盐度的最大潜力。在测试的最高盐度（50 gNaCl L）下，发现属于 Cryomorphaceae 和 Rhodobacteraceae 属的微生物海洋物种在这两种系统中均占主导地位。无论盐度如何，有机碳的去除率均约为 98%。同样，氮的去除是通过硝化-反硝化作用发生的，不受盐度的影响。氨利用率和亚硝酸盐利用率分别约为 3.60 mgNH-N gVSSh 和 10.0 mgNO-N gVSSh，表明硝化和反硝化细菌具有很高的活性。颗粒化过程并没有显著改善营养物质去除过程，这可能是由于逐步提高盐度的策略。由于活性污泥絮体和颗粒内盐的积累，SRT 较长（27 天）会影响生物量的活性和性能。相比之下，较低的 SRT（14 天）有利于具有较高惰性含量的颗粒和絮体的排放，从而增强了生物量的更新。研究结果表明，利用本土嗜盐菌是处理高浓度碳氮含盐废水的一种有价值的方法，可以在很宽的盐度范围内使用。此外，逐步提高盐度和低 SRT 操作使代谢活性高，并避免生物量聚集体内盐的过度积累，限制了由于松散结合的胞外聚合物增加而导致的物理结构破坏。
