Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Campus do Pici, Bloco 713. Pici., Fortaleza, CE, 60455-900, Brazil.
Bioprocess Biosyst Eng. 2021 Feb;44(2):259-270. doi: 10.1007/s00449-020-02439-w. Epub 2020 Sep 5.
The engineering and microbiological aspects involved in the production of alginate-like exopolysaccharides (ALE) and tryptophan (TRY) in aerobic granular sludge systems were evaluated. The inclusion of short anoxic phase (A/O/A cycle-anaerobic, oxic, and anoxic phase) and the control of sludge retention time (SRT ≈ 10 days) proved to be an important strategy to increase the content of these bioproducts in granules. The substrate concentration also has a relevant impact on the production of ALE and TRY. The results of the microbiological analysis showed that slow-growing heterotrophic microbial groups (i.e., PAOs and GAOs) might be associated with the production of ALE, and the EPS-producing fermentative bacteria might be associated with the TRY production. The preliminary economic evaluation indicated the potential of ALE recovery in AGS systems in decreasing the OPEX (operational expenditure) of the treatment, especially for larger sewage treatment plants or industrial wastewaters with a high organic load.
评估了好氧颗粒污泥系统中生产藻酸盐样胞外多糖（ALE）和色氨酸（TRY）的工程学和微生物学方面。事实证明，包括短缺氧阶段（A/O/A 循环-缺氧、好氧和缺氧阶段）和控制污泥停留时间（SRT≈10 天）是增加颗粒中这些生物产物含量的重要策略。基质浓度对 ALE 和 TRY 的生产也有相关影响。微生物分析的结果表明，生长缓慢的异养微生物群体（即 PAOs 和 GAOs）可能与 ALE 的生产有关，而产生 EPS 的发酵细菌可能与 TRY 的生产有关。初步的经济评估表明，在 AGS 系统中回收 ALE 有潜力降低处理的 OPEX（运营支出），特别是对于较大的污水处理厂或有机负荷较高的工业废水。
