A novel index of total oxygen demand for the comprehensive evaluation of energy consumption for urban wastewater treatment

Luo, Li; Dzakpasu, Mawuli; Yang, Baichuan; Zhang, Wu-Shou; Yang, Yue; Wang, Xiaochang C.

doi:10.1016/j.apenergy.2018.11.101

Cited by 63 publications

(31 citation statements)

References 33 publications

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“…However, the high energy consumption of aeration in the activated sludge system leads to an increase in operation costs. The mean energy consumption of a conventional wastewater treatment plant ranges between 0.1-1.89 kWh/m 3 (Hey et al, 2018;Kimura et al, 2017;L. Luo et al, 2019;Mizuta and Shimada, 2010;Plappally and Lienhard V, 2012;Wan et al, 2016;Zhang et al, 2016).…”

Section: Conventional Activated Sludge Methodsmentioning

confidence: 99%

Direct membrane filtration for wastewater treatment and resource recovery: A review

Hube

Eskafi

Hrafnkelsdóttir

et al. 2020

Science of The Total Environment

413

110

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Direct membrane filtration (DMF) of municipal wastewater offers an alternative solution for centralized and decentralized wastewater treatment in Iceland. The efficiency of biologicalbased wastewater treatment is restricted in Iceland, due to low temperatures and high wastewater inflow rates with extremely low concentration of organics. This study aims to investigate membrane fouling mechanisms and mitigation approaches during DMF of municipal wastewater. The DMF experiments were performed using a crossflow flat sheet membrane filtration cell integrated with an optical coherence tomography (OCT) imaging system. The effects of membrane material, operation conditions and cleaning protocol on DMF performance and foulant composition were examined. The threshold flux testing results indicated that a PVDF membrane (0.08 μm) was suitable for DMF of wastewater. Increasing crossflow velocity, physical flushing frequency and flushing water temperature contributed greatly to mitigate fouling. During a continuous DMF process, reversible fouling was predominant, while during intermittent DMF with periodical physical cleaning, irreversible/ irremovable fouling was dominant. A possible shift of tightly attached cake layer to irreversible/ irremovable fouling was revealed by the direct observation of fouling via OCT. The foulants autopsy indicated that a combination of organic and inorganic foulants was attributed to membrane fouling, instead of biological fouling. Under the optimized filtration condition, sustainable long-term DMF operation (~230 h) was achieved by employing a combination of periodical physical flushing with chemical-enhanced flushing. The water quality analysis showed that the DMF process could efficiently remove solids and greater-sized soluble organics, allowing the treated water to meet wastewater discharge standards.

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Section: Conventional Activated Sludge Methodsmentioning

confidence: 99%

Direct membrane filtration for wastewater treatment and resource recovery: A review

Hube

Eskafi

Hrafnkelsdóttir

et al. 2020

Science of The Total Environment

413

110

View full text Add to dashboard Cite

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“…Biological nutrient removal (BNR) is the most common process implemented for simultaneous P and N removal, typically through sequential zones in activated sludge systems: anaerobic for carbon uptake and P release; anoxic for heterotrophic denitrification and P uptake; and aerobic for nitrification and P uptake. Such BNR systems require intensive O 2 supply, often accounting for approximately 60% of WWTPs energy costs [4,5].…”

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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“…In municipal wastewater treatment plants (WWTPs) ammonium undergoes full nitrification, a process with a considerable effect on the design, footprint and costs (Jaramillo et al, 2018). In particular, very high electrical energy is required to supply a large amount of external oxygen for nitrification (Åmand et al, 2013;Luo et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

How suspended solids concentration affects nitrification rate in microalgal-bacterial photobioreactors without external aeration

Foladori

Petrini

Andreottola

2020

Heliyon

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The use of microalgae for the treatment of municipal wastewater makes possible to supply oxygen and save energy, but must be coupled with bacterial nitrification to obtain nitrogen removal efficiency above 90%. This paper explores how the concentration of Total Suspended Solids (TSS, from 0.2 to 3.9 g TSS/L) affects the nitrification kinetic in three microalgal-bacterial consortia treating real municipal wastewater. Two different behaviors were observed: (1) solid-limited kinetic at low TSS concentrations, (2) light-limited kinetic at higher concentrations. For each consortium, an optimal TSS concentration that produced the maximum volumetric ammonium removal rate (around 1.8-2.0 mg N L À1 h À1 ), was found. The relationship between ammonium removal rate and TSS concentration was then modelled considering bacteria growth, microalgae growth and limitation by dissolved oxygen and light intensity. Assessment of the optimal TSS concentrations makes possible to concentrate the microbial biomass in a photobioreactor while ensuring high kinetics and a low footprint.

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A novel index of total oxygen demand for the comprehensive evaluation of energy consumption for urban wastewater treatment

Cited by 63 publications

References 33 publications

Direct membrane filtration for wastewater treatment and resource recovery: A review

Direct membrane filtration for wastewater treatment and resource recovery: A review

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

How suspended solids concentration affects nitrification rate in microalgal-bacterial photobioreactors without external aeration

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