Effects of substrate stress and light intensity on enhanced biological phosphorus removal in a photo-activated sludge system

Mohamed, A.Y.A.; Welles, Laurens; Siggins, Alma; Healy, Mark G.; Brdjanović, Damir; Rada-Ariza, A.M.; López-Vázquez, Carlos M.

doi:10.1016/j.watres.2020.116606

Cited by 20 publications

(9 citation statements)

References 35 publications

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“…In an SBR, a batch operation process follows the order of fill, react, settle and draw/decant, with the "react" stage incorporating a single non-aeration period, followed by a single aeration period. During the non-aeration period, anaerobic denitrifying bacteria reduce oxidised nitrogen to nitrogen gas, and phosphate accumulating organisms (PAOs) release PO 4 -P contained within their cells [16]. In the subsequent aeration period, aerobic nitrifying bacteria convert ammonium-nitrogen (NH 4 -N) to nitrite (NO 2 -N) and nitrate (NO 3 -N) [17].…”

Section: Introductionmentioning

confidence: 99%

“…In the subsequent aeration period, aerobic nitrifying bacteria convert ammonium-nitrogen (NH 4 -N) to nitrite (NO 2 -N) and nitrate (NO 3 -N) [17]. Concurrently, PAOs uptake PO 4 -P [16]. Due to the increased number of PAOs in the system resulting from rapid replication under aerobic conditions, PAOs uptake a greater mass of PO 4 -P than they release during the non-aeration period.…”

Section: Introductionmentioning

confidence: 99%

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Deployment and Optimisation of a Pilot-Scale IASBR System for Treatment of Dairy Processing Wastewater

et al. 2021

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Increased pressure is being applied to industrial wastewater treatment facilities to adhere to more stringent regulations for the discharge of treated wastewater and to improve energy efficiency of the process. Nitrogen and phosphorous removal can be challenging to achieve efficiently, and in the case of phosphorous removal, can often necessitate the use of chemicals. There is a major drive globally to improve wastewater treatment infrastructure, whilst simultaneously reducing the carbon footprint of the process. The intermittently aerated sequencing batch reactor offers a modification of the well-known sequencing batch reactor process that can enable lower energy requirements than conventional sequencing batch reactor processes and can facilitate enhanced nutrient removal capacities. However, to date much of the previous literature has focused on relatively short laboratory-scale trials (often with synthetic wastewater) which may not be representative of larger scale system performance. This study explored the intermittently aerated sequencing batch reactor technology via a case-study deployment at a dairy production facility, in terms of treatment efficiency and energy efficiency with a focus on optimisation between phases. High treatment capacity and operational flexibility was achieved with NH4-N removals averaging >89%, PO4-P removal averaging >90% and total suspended solids removal averaging >97%. This research demonstrates the characteristics of intermittently aerated sequencing batch reactor technology at scale to effectively achieve biological nutrient removal. In addition, this study demonstrated that when effectively managed, energy savings and reductions in carbon emissions in the region of 36–68% are achievable through optimisation of reactor operation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deployment and Optimisation of a Pilot-Scale IASBR System for Treatment of Dairy Processing Wastewater

et al. 2021

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“…Compared to previous photogranules and non-granular photoEBPR systems (Abouhend et al, 2018;Ji et al, 2020;Mohamed et al, 2021), COD and nitrogen removal were improved by 2-3x in PG+, expect for PG where similar N removal was found (Trebuch et al, 2020). P removal was enhanced by 3-6x due to integration of PAOs into the PG+.…”

Section: Pg+ Wastewater Treatment Performancementioning

confidence: 59%

“…The combination of phototrophs and PAOs has previously been investigated in nongranular systems as photoEBPR with promising results, showing improved phosphorus removal compared to other phototrophic systems (Carvalho et al, 2021(Carvalho et al, , 2018Mohamed et al, 2021;Oyserman et al, 2017). Due to the presence of phototrophs, in some studies all required oxygen for the EBPR process could be produced in-situ via photosynthesis, abolishing the need for mechanical aeration (Mohamed et al, 2021;Oyserman et al, 2017). The metabolic functions within the photoEBPR process are 1) photosynthesis, 2) polyphosphate accumulation, 3) chemoheterotrophy (COD removal), 4) nitrification and 5) denitrification.…”

Section: Introductionmentioning

confidence: 99%

“…Combining all functions together in one reactor system can be difficult as competition for nutrients and inhibition (e.g., by product accumulation) can adversely affect microorganisms. Competition between phototrophs, nitrifiers and PAOs for nutrients often led to suboptimal removal rates and a decrease in PAO abundance (Carvalho et al, 2018;Mohamed et al, 2021). Additionally, nitrite-oxidizing bacteria have been shown to be sensitive to light and compete with phototrophs for CO 2 (Wang et al, 2015), while PAOs are sensitive to high nitrite and oxygen concentration (Chen et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Photogranules for wastewater treatment : From community assembly to targeted microbial functions

Trebuch¹

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Photogranules are dense, spherical agglomerates of cyanobacteria, microalgae and non-phototrophic microorganisms that have considerable advantages in terms of harvesting and nutrient removal rates for light driven wastewater treatment processes. This ecosystem is poorly understood in terms of the microbial community structure and the response of the community to changing abiotic conditions. To get a better understanding, we investigated the effect of hydraulic retention time (HRT) on photogranule formation and community assembly over a period of 148 days. Three laboratory bioreactors were inoculated with field samples from various locations in the Netherlands and operated in sequencing batch mode. The bioreactors were operated at four different HRTs (2.00, 1.00, 0.67, 0.33 days), while retaining the same solid retention time of 7 days. A microbial community with excellent settling characteristics (95-99% separation efficiency) was established within 2 to 5 weeks. The observed nutrient uptake rates ranged from 24 to 90 mgN L -1 day -1 and from 3.1 to 5.4 mgP L -1 day -1 depending on the applied HRT. The transition from single-cell suspension culture to floccular agglomeration to granular sludge was monitored by microscopy and 16S and 18S rRNA gene amplicon sequencing. In particular, two important variables for driving aggregation and granulation, and for the structural integrity of photogranules were identified: 1. Extracellular polymeric substances (EPS) with high protein to polysaccharide ratio and 2. specific microorganisms. The key players were found to be the cyanobacteria Limnothrix and Cephalothrix, the colony forming photosynthetic eukaryotes within Chlamydomonadaceae, and the biofilm producing bacteria Zoogloea and Thauera. Knowing the makeup of the microbial community and the operational conditions influencing granulation and bioreactor function is crucial for successful operation of photogranular systems.

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Advances of high-throughput sequencing for unraveling biotechnological potential of microalgal-bacterial communities

Zaytsev,

Rodin,

Zaytseva

et al. 2024

J Appl Phycol

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Effects of substrate stress and light intensity on enhanced biological phosphorus removal in a photo-activated sludge system

Cited by 20 publications

References 35 publications

Deployment and Optimisation of a Pilot-Scale IASBR System for Treatment of Dairy Processing Wastewater

Deployment and Optimisation of a Pilot-Scale IASBR System for Treatment of Dairy Processing Wastewater

Photogranules for wastewater treatment : From community assembly to targeted microbial functions

Advances of high-throughput sequencing for unraveling biotechnological potential of microalgal-bacterial communities

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