Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil.
Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil.
Chemosphere. 2023 Jan;311(Pt 1):137006. doi: 10.1016/j.chemosphere.2022.137006. Epub 2022 Oct 27.
The influence of salt addition to stimulating biopolymers production in aerobic granular sludge (AGS) systems was evaluated. The control systems (R1: acetate and R2: propionate) initially obtained less accumulation of mixed liquor volatile suspended solids (MLVSS), indicating that the osmotic pressure in the salt-supplemented systems (R3: acetate and R4: propionate) contributed to biomass growth. However, the salt-supplemented systems collapsed between days 110 and 130 of operation. R3 and R4 showed better performance regarding nutrients removal due to the greater abundance of nitrifying and denitrifying bacteria and phosphate-accumulating organisms. Salt also contributed to the higher production of biopolymers such as alginate-like exopolymers (ALE) per gram of volatile suspended solids (VSS) (R1: 397 mgALE∙gVSS, R2: 140 mgALE∙gVSS, R3: 483 mgALE∙gVSS, R4: 311 mgALE∙gVSS). Amino acids like tyrosine and tryptophan were better identified in extracellular polymeric substances extract from salt-operated reactors. This study brings important results in the context of resource recovery by treating saline effluents.
评估了向需氧颗粒污泥（AGS）系统中添加盐来刺激生物聚合物生产的影响。对照系统（R1：乙酸盐和 R2：丙酸盐）最初获得的混合液挥发性悬浮固体（MLVSS）积累较少，表明添加盐的系统（R3：乙酸盐和 R4：丙酸盐）中的渗透压有助于生物量生长。然而，在运行第 110 天到第 130 天之间，添加盐的系统崩溃了。R3 和 R4 由于硝化菌和反硝化菌以及聚磷菌的丰度更高，在去除营养物质方面表现出更好的性能。盐的添加还促进了生物聚合物如藻酸盐样胞外聚合物（ALE）的更高产量（每克挥发性悬浮固体（VSS）产生的 ALE，R1：397mg ALE∙gVSS，R2：140mg ALE∙gVSS，R3：483mg ALE∙gVSS，R4：311mg ALE∙gVSS）。从盐操作反应器的胞外聚合物提取物中可以更好地鉴定出酪氨酸和色氨酸等氨基酸。本研究在处理含盐废水以实现资源回收方面带来了重要结果。
