Continuous municipal wastewater up-concentration by direct membrane filtration, considering the effect of intermittent gas scouring and threshold flux determination

Nascimento, Thiago A.; Miranda, Mar Peña

doi:10.1016/j.jwpe.2020.101733

Cited by 14 publications

(7 citation statements)

References 48 publications

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“…COD losses to the permeate were driven by sCOD concentrations, with COPAS having 16% of tCOD, while diluted WW had 23%. This compares well to the sCOD/tCOD fractions observed by Men et al of 12% (2023) and 18% in Nascimento and Miranda (2021) [7,17]. The slower solubilization rate of COPAS also influenced the permeate and concentrate qualities.…”

Section: Removal and Recoverysupporting

confidence: 88%

“…Even though slightly different concentration factors and fouling patterns were observed for both influents, the average organic recovery was similar, achieving 65.5% and 64.0% for COPAS and diluted WW, respectively. This compares to a recovery rate of 54% by Nascimento and Miranda (2021), 50% by Sugiyama et al ( 2022), 45-75% by Lateef et al (2013), and 45% by the control study presented in Yang et al (2023) [4,17,25]. Some DMF studies indicate higher organic recovery rates; however, these studies employ pretreatment strategies, such as flocculation, to aid in the recovery of sCOD [25,26].…”

Section: Removal and Recoverymentioning

confidence: 72%

“…The recovery rate of organics is dictated by the sCOD/tCOD ratio, CF, and extent to which organics pass unimpeded through the membrane, which is best described by the tCOD rejection rate. [7,17,27]. On average, the COPAS tCOD rejection rates were slightly higher than for the diluted WW batches, which increased the final tCOD concentrations in the concentrate.…”

Section: Removal and Recoverymentioning

confidence: 94%

“…From the extensive body of membrane bioreactor literature, which has parallels to the DMF literature, it is known that each of these testing parameters have profound effects on the membrane fouling rates observed in the corresponding trials [5,6,14,15]. Even for studies using the same experimental conditions, the natural variability of wastewater can obfuscate experimental results [6,16,17]. Domestic wastewater is also known to have large hourly, seasonal, and regional variability that can limit the universal applicability of the fouling mitigation strategies employed in individual studies [3].…”

Section: Introductionmentioning

confidence: 99%

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Direct Membrane Filtration of Wastewater: A Comparison between Real and Synthetic Wastewater

Uman,

Bair,

Yeh

2024

Water

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In this study, a lab scale direct membrane filtration (DMF) system using ultrafiltration membranes was operated to compare synthetic and real wastewater to evaluate their membrane fouling propensity and the partitioning of organics and nutrients during concentration. For fouling prevention, cyclic operation was used which consisted of 90 s of filtration followed by 15 s of relaxation and backwashing conducted every 15 min. The system was tested at a high initial flux of 80 LMH (L/m2·h), and the trials were run until a 90% volume reduction was achieved for each batch. Both the synthetic and real wastewater showed similar fouling propensities and organic and nutrient partitioning. The synthetic and real wastewater had an average flux of 46.3 LMH and 28.5 LMH and an average total chemical oxygen demand rejection of 90.3% and 83.1% after 30 h of operation, respectively. The recovery of organics was similar in both influents, resulting in 65.5% and 64.0% of the total chemical oxygen demand concentrations in the concentrate stream for synthetic and real wastewaters, respectively. The total phosphorous and nitrogen concentrations were also similar in terms of rejection rates resulting in 85% and 78% for the synthetic and 89% and 65% for the fresh WWs, respectively. The comparison revealed that synthetic wastewater, though not identical to real wastewater, can serve as a surrogate in DMF studies. This will help to remove one of the key sources of variability in current DMF studies and will allow for more rapid development of DMF technology.

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Section: Removal and Recoverysupporting

confidence: 88%

Section: Removal and Recoverymentioning

confidence: 72%

Section: Removal and Recoverymentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Direct Membrane Filtration of Wastewater: A Comparison between Real and Synthetic Wastewater

Uman,

Bair,

Yeh

2024

Water

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“…Current, state-of-the-art UF membranes can take the COD of raw wastewater to 20-55 gO 2 COD/L (2-5.5%) in the retentate [37]. Specific values of 46,882 gO 2 COD/L [38] and between 19,000 and 54,000 gO 2 COD/L [39] have been reported recently by using a hollow fiber membrane module with a nominal pore size of 0.04 microns, including all particulate COD. Some drawbacks of this technology include the high cost of equipment, and the aeration required to clean the membrane surface in order to avoid clogging problems.…”

Section: Ultrafiltrationmentioning

confidence: 99%

Analysis of the Energy Flow in a Municipal Wastewater Treatment Plant Based on a Supercritical Water Oxidation Reactor Coupled to a Gas Turbine

et al. 2021

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Biological municipal wastewater treatments lead to high sludge generation and long retention times, and the possibilities for recovery of the energy content of the input waste stream are very limited due to the low operating temperature. As an alternative, we propose a sequence of exclusively physicochemical, non-biological stages that avoid sludge production, while producing high-grade energy outflows favoring recovery, all in shorter times. Ultrafiltration and evaporation units provide a front-end concentration block, while a supercritical water oxidation reactor serves as the main treatment unit. A new approach for energy recovery from the effluent of the reactor is proposed, based on its injection in a gas turbine, which presents advantages over simpler direct utilization methods from operational and efficiency points of view. A process layout and a numerical simulation to assess this proposal have been developed. Results show that the model process, characterized with proven operating parameters, found a range of feasible solutions to the treatment problem with similar energy costs, at a fast speed, without sludge production, while co-generating the municipality’s average electricity consumption.

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Fouling control strategies for direct membrane ultrafiltration: Physical cleanings assisted by membrane rotational movement

Ruigómez

Cabrera

Gómez

et al. 2022

Chemical Engineering Journal

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Continuous municipal wastewater up-concentration by direct membrane filtration, considering the effect of intermittent gas scouring and threshold flux determination

Cited by 14 publications

References 48 publications

Direct Membrane Filtration of Wastewater: A Comparison between Real and Synthetic Wastewater

Direct Membrane Filtration of Wastewater: A Comparison between Real and Synthetic Wastewater

Analysis of the Energy Flow in a Municipal Wastewater Treatment Plant Based on a Supercritical Water Oxidation Reactor Coupled to a Gas Turbine

Fouling control strategies for direct membrane ultrafiltration: Physical cleanings assisted by membrane rotational movement

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