The impact of operational strategies on the performance of a photo-EBPR system

Carvalho, V.C.F.; Freitas, Elisabete B.; Silva, Paulo; Fradinho, Joana; Reis, Maria A.M.; Oehmen, Adrian

doi:10.1016/j.watres.2017.11.010

Cited by 28 publications

(10 citation statements)

References 31 publications

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“…where VSS (g m −2 ) represents the biomass of the suspended carriers, and V (m 3 m −2 ) denotes the biofilm volume on the surface area of the carriers (Alves et al, 2002;Shi et al, 2015). The specific denitrification rates were determined in accordance with the method described by Carvalho et al (2018). DO and pH were monitored using a portable multi-parameter meter (WTW 3430, Germany).…”

Section: Methodsmentioning

confidence: 99%

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Correlation of extracellular polymeric substances and microbial community structure in denitrification biofilm exposed to adverse conditions

Wang

Zhi

Shan

et al. 2020

Microbial Biotechnology

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Microbial community may respond to different adverse conditions and result in the variation of extracellular polymeric substances (EPS) in denitrification biofilm; this study discovered the role of EPS in accordance with the analysis of cyclic diguanylate (c-di-GMP) and electron equilibrium (EE) under low organic loading rate, shock organic loading rate and low temperature conditions. Good nitrate removal performance could be achieved under shock organic loading rate and low temperature conditions; however, owing to the low organic loading rate, the carbon source was preferentially utilized for biomass growth. Tightly bound EPS (TB-EPS) contents progressively increased and facilitated cell adhesion and biofilm formation. The stable TB protein (TB-PN) content in TB-EPS built a cross-linked network to maintain internal biofilm structure and led to the rapid biosynthesis of polysaccharides, which could further enhance microbial adhesion and improve nitrate removal. C-di-GMP played an important role in biomass retention and biofilm formation, based on the correlation analysis of c-di-GMP and EPS. TB polysaccharide (TB-PS) contents presented a significant positive correlation with c-di-GMP content, microbial adhesion and biofilm stabilization was further enhanced through c-di-GMP regulation. In addition, a remarkable negative correlation between electron deletion rate (EDR) and TB-PN and TB-PS was discovered, and TB-PS was required to serve as energy source to enhance denitrification according to EE analysis. Surprisingly, dynamic microbial community was observed due to the drastic community succession under low temperature conditions, and the discrepancy between the dominant species for denitrification was found under shock organic loading rate and low temperature conditions. The notable increase in bacterial strains Simlicispira, Pseudomonas and Chryseobacterium was conducive to biofilm formation and denitrification under shock organic loading rate, while Dechloromonas and Zoogloea dramatically enriched for nitrate removal under low temperature conditions. The high abundance of Dechloromonas improved the secretion of EPS through the downstream signal transduction, and the c-di-GMP conserved in Pseudomonas concurrently facilitated to enhance exopolysaccharide production to shock organic loading rate and low temperature conditions.

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Section: Methodsmentioning

confidence: 99%

“…The specific denitrification rates were determined in accordance with the method described by Carvalho et al . (2018). DO and pH were monitored using a portable multi‐parameter meter (WTW 3430, Germany).…”

Section: Methodsmentioning

confidence: 99%

Correlation of extracellular polymeric substances and microbial community structure in denitrification biofilm exposed to adverse conditions

Wang

Zhi

Shan

et al. 2020

Microbial Biotechnology

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“…The thickness of lines indicates the number of processes within a given category (e.g., biological processes or biological nitrogen processes), and the size of points indicates the number of processes within a given process group (e.g., microbial fuel cell). A full list of processes, as well as classification into process groups and by core attributes, is included in Table S3-1. − ...…”

Section: State Of the Artmentioning

confidence: 99%

Systematic Evaluation of Emerging Wastewater Nutrient Removal and Recovery Technologies to Inform Practice and Advance Resource Efficiency

et al. 2021

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Advancing nutrient recovery from idea to implementation requires reporting practices that facilitate comparison among diverse nutrient removal and recovery (NRR) technologies and enhance the translation of academic research to practice. We reviewed 157 technologies that treat nitrogen-and/or phosphorusladen wastewater across several underlying mechanisms, stages of development, and scales of operation. We outline a systematic reporting and analysis framework to characterize NRR technologies using quantitative performance metrics (i.e., removal and recovery efficiency, removal and recovery rate, energy consumption, cost, greenhouse gas emissions, effluent concentration) and qualitative attributes (e.g., technology readiness level). Comparing peerreviewed literature with practitioner needs reveals limited reporting of energy consumption and cost, indicating misalignment between research and practice. By synthesizing literature and practitioner input on anticipated benefits, barriers to adoption, and knowledge gaps, we identify opportunities for expanding benefits achieved by NRR technologies and aligning research with critical barriers. We propose a research agenda addressing the most reported gaps (e.g., underlying process mechanisms, scale-up) and emphasizing rigorous investigations of systems-level impacts and product-market fit. Results from this study will facilitate interdisciplinary research on NRR technologies, guide technology development by academics and practitioners, and accelerate implementation for resource-efficient nutrient management fit for 21 st century challenges.

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“…In addition, higher nutrient recovery can be achieved when compared with anaerobic technologies in WWTPs [9,10], and the good settling properties of the microalgal-bacterial flocs reduce the biomass harvesting costs associated with microalgal systems [11,12]. Recently, a photo-enhanced biological phosphorus removal (photo-EBPR) system composed of a consortium of microalgae and bacteria demonstrated a good capacity for P removal at a low chemical oxygen demand (COD) to P ratio (COD/P) and without external aeration requirements [13]. The photo-EBPR system was operated with dark-light cycles, simulating conventional anaerobic-aerobic EBPR cycles, resulting in a culture enriched with polyphosphate accumulating organisms (PAOs) and microalgae [13].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, a photo-enhanced biological phosphorus removal (photo-EBPR) system composed of a consortium of microalgae and bacteria demonstrated a good capacity for P removal at a low chemical oxygen demand (COD) to P ratio (COD/P) and without external aeration requirements [13]. The photo-EBPR system was operated with dark-light cycles, simulating conventional anaerobic-aerobic EBPR cycles, resulting in a culture enriched with polyphosphate accumulating organisms (PAOs) and microalgae [13].…”

Section: Introductionmentioning

confidence: 99%

Raman Spectrometry as a Tool for an Online Control of a Phototrophic Biological Nutrient Removal Process

et al. 2021

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Real-time bioprocess monitoring is crucial for efficient operation and effective bioprocess control. Aiming to develop an online monitoring strategy for facilitating optimization, fault detection and decision-making during wastewater treatment in a photo-biological nutrient removal (photo-BNR) process, this study investigated the application of Raman spectroscopy for the quantification of total organic content (TOC), volatile fatty acids (VFAs), carbon dioxide (CO2), ammonia (NH3), nitrate (NO3), phosphate (PO4), total phosphorus (total P), polyhydroxyalkanoates (PHAs), total carbohydrates, total and volatile suspended solids (TSSs and VSSs, respectively). Specifically, partial least squares (PLS) regression models were developed to predict these parameters based on Raman spectra, and evaluated based on a full cross-validation. Through the optimization of spectral pre-processing, Raman shift regions and latent variables, 8 out of the 11 parameters that were investigated—namely TOC, VFAs, CO2, NO3, total P, PHAs, TSSs and VSSs—could be predicted with good quality by the respective Raman-based PLS calibration models, as shown by the high coefficient of determination (R2 > 90.0%) and residual prediction deviation (RPD > 5.0), and relatively low root mean square error of cross-validation. This study showed for the first time the high potential of Raman spectroscopy for the online monitoring of TOC, VFAs, CO2, NO3, total P, PHAs, TSSs and VSSs in a photo-BNR reactor.

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The impact of operational strategies on the performance of a photo-EBPR system

Cited by 28 publications

References 31 publications

Correlation of extracellular polymeric substances and microbial community structure in denitrification biofilm exposed to adverse conditions

Correlation of extracellular polymeric substances and microbial community structure in denitrification biofilm exposed to adverse conditions

Systematic Evaluation of Emerging Wastewater Nutrient Removal and Recovery Technologies to Inform Practice and Advance Resource Efficiency

Raman Spectrometry as a Tool for an Online Control of a Phototrophic Biological Nutrient Removal Process

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