Side-stream phosphorus famine selectively strengthens glycogen accumulating organisms (GAOs) for advanced nutrient removal in an anaerobic-aerobic-anoxic system

Dan, Qiongpeng; Peng, Yongzhen; Wang, Bo; Wang, Qi; Sun, Tao

doi:10.1016/j.cej.2021.129554

Cited by 46 publications

(5 citation statements)

References 48 publications

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“…The difference of glycogen degradation trend was correspondent to the COD removal, confirming that the different carbon sources resulted in internal-to-external carbon transformation [1]. Additionally, it is worth noting that glycogen in SBR2 # increased significantly at 90~180 min, the possible reason being that GAOs could directly synthesize glycogen by using the glucose (40-50 mg/L) presented under condition [25].…”

Section: Characteristics Of Intracellular Carbons Transformations Via...mentioning

confidence: 57%

Effect of Carbon Source on Endogenous Partial Denitrification Process: Characteristics of Intracellular Carbon Transformation and Nitrite Accumulation

Xiang,

Li,

You

et al. 2024

Water

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This study focused on the start-up and operating characteristics of the endogenous partial denitrification (EPD) process with different carbon sources. Two sequencing batch reactors (SBRs) with sodium acetate (SBR1#) and glucose (SBR2#) as carbon sources were operated under anaerobic/oxic (A/O) and anaerobic/anoxic/oxic (A/A/O) modes successively for 240 d. The results showed that COD removal efficiency reached 85% and effluent COD concentrations were below 35 mg/L in both SBRs. The difference was that faster absorption and transformation of sodium acetate was achieved compared to glucose (COD removal rate (CRR) was 7.54 > 2.22 mgCOD/(L·min) in SBR1# compared to SBR2#). EPD could be started up with sodium acetate and glucose as carbon sources, respectively, and desirable high nitrite accumulations were both obtained at influent NO3−−N (NO3−-Ninf) increased from 20 to 40 mg/L with nitrate-to-nitrite transformation ratio (NTR) and specific NO3−-N deduction rate (rNa) of 88.4~90% and 2.41~2.38 mgN/(gVSS·h), respectively. However, at NO3−-N of 50~60 mg/L, both the NTR and rNa in SBR1# were higher compared to SBR2# (86.5% > 83.9% and 1.58 > 1.20 mgN/(gVSS·h), respectively). Hereafter, when NO3−-N was increased by 70~90 mg/L, lower NTR and rNa were observed in SBR1# than in SBR2# (72% and 78%, 1.16 and 1.32 mgN/(gVSS·h), respectively). Additionally, similar internal carbon transformations were observed to drive EPD for NO2−−N accumulation, especially for higher and faster carbon transformation with sodium acetate as carbon source compared to glucose. However, precise control of anoxic time as the peak point of nitrite (TNi,max) was still the key to achieve high NO2−−N accumulation.

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Section: Characteristics Of Intracellular Carbons Transformations Via...mentioning

confidence: 57%

Effect of Carbon Source on Endogenous Partial Denitrification Process: Characteristics of Intracellular Carbon Transformation and Nitrite Accumulation

Xiang,

Li,

You

et al. 2024

Water

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“…Previous research indicates that GAOs tend to become dominant microorganisms in a bioreactor system that is operated under sequential anaerobic storage and subsequent biomass exposure to air conditions [27]. A GAO's ability to synthesize PHAs from carbon sources during the anaerobic stage [16] suggests that the successful enrichment of GAOs is likely the primary factor underlying the superior COD removal capacity of biofilms in the P-RBC under anaerobic conditions.…”

Section: Evolution Of Anaerobic Cod Removal Capacity By Biofilm From ...mentioning

confidence: 99%

“…Recent studies have highlighted GAOs as especially effective in pollution removal. GAOs have unique biological capabilities as they use carbon sources to produce PHAs during the anaerobic stage and then use these PHAs for nitrogen removal in the aerobic stage [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Low-Energy Chemical Oxygen Demand (COD) Removal in Aeration-Free Conditions through Pulse-Rotating Bio-Contactors Enriched with Glycogen-Accumulating Organisms

Cheng,

Deng,

Zhang

et al. 2024

Water

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This study presents an innovative pulse-rotating biological contactor (P-RBC) designed to enrich glycogen-accumulating organisms (GAOs), thereby facilitating low-energy chemical oxygen demand (COD) removal. It then investigates the impact of rotational speed and hydraulic retention time (HRT) on GAO enrichment and COD removal efficiency. Optimized conditions at lower speeds and longer HRTs significantly enhance GAO proliferation and Polyhydroxyalkanoate (PHA) synthesis, the key to COD removal. Noteworthy findings include a maximum GAO abundance of 21.34% at a half round per hour (rph) rotating speed, which correlates with a 90.2% COD removal rate and an HRT of 6 h, yielding a 21.23% GAO abundance and 89.8% COD removal. This study also explores various carbon sources for PHA synthesis, with sodium acetate proving the most effective. Compared to other wastewater treatment methods, P-RBC demonstrates minimal energy consumption (0.09 kWh per ton of wastewater), highlighting its potential as a sustainable and effective approach for wastewater treatment.

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“…A laboratory-scale unsealed sequencing batch reactor (SBR) with a working volume of 8 L was operated. The seed sludge was collected from a SBR that was highly enriched with glycogenaccumulating organisms (GAOs) 32 and a pilot-scale nitritationanammox (PNA) reactor treating ammonium-rich wastewater at the Gaobeidian Wastewater Treatment Plant (Beijing, China). After mixing the two types of activated sludge (a mixing ratio of ∼1:1), the level of mixed liquor suspended solids (MLSS) was 2993.6 mg L −1 , and the mean particle size was 98.9 μm.…”

Section: Bioreactor Setup and Operationmentioning

confidence: 99%

Highly Enriched Anammox Bacteria with a Novel Granulation Model Regulated by Epistylis spp. in Domestic Wastewater Treatment

Dan

et al. 2023

Environ. Sci. Technol.

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Anammox granulation is an efficient solution proffered to enrich slow-growing anammox bacteria (AnAOB), but the lack of effective granulation strategies for low-strength domestic wastewater impedes its application. In this study, a novel granulation model regulated by Epistylis spp. for highly enriched AnAOB was revealed for the first time. Notably, anammox granulation was achieved within 65 d of domestic wastewater treatment. The stalks of Epistylis spp. were found to act as the skeleton of granules and provide attachment points for bacterial colonization, and the expanded biomass layer in turn provided more area for the unstalked free-swimming zooids. Additionally, Epistylis spp. exerted much less predation stress on AnAOB than on nitrifying bacteria, and AnAOB tended to grow in aggregates in the interior of granules, thus favoring the growth and retention of AnAOB. Ultimately, the relative abundance of AnAOB reached up to a maximum of 8.2% in granules (doubling time of 9.9 d) compared to 1.1% in flocs (doubling time of 23.1 d), representing the most substantial disparity between granules and flocs. Overall, our findings advance the current understanding of interactions involved in granulation between protozoa and microbial communities and offer new insight into the specific enrichment of AnAOB under the novel granulation model.

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Side-stream phosphorus famine selectively strengthens glycogen accumulating organisms (GAOs) for advanced nutrient removal in an anaerobic-aerobic-anoxic system

Cited by 46 publications

References 48 publications

Effect of Carbon Source on Endogenous Partial Denitrification Process: Characteristics of Intracellular Carbon Transformation and Nitrite Accumulation

Effect of Carbon Source on Endogenous Partial Denitrification Process: Characteristics of Intracellular Carbon Transformation and Nitrite Accumulation

Enhanced Low-Energy Chemical Oxygen Demand (COD) Removal in Aeration-Free Conditions through Pulse-Rotating Bio-Contactors Enriched with Glycogen-Accumulating Organisms

Highly Enriched Anammox Bacteria with a Novel Granulation Model Regulated by Epistylis spp. in Domestic Wastewater Treatment

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