Decentralized treatment of domestic sewage in dynamic membrane bioreactor

Chimuca, Jacob Fortuna José; Sousa, José Tavares de; Lopes, Wilton Silva; Leite, Valderí Duarte; Canto, Catarina Simone Andrade do

doi:10.5004/dwt.2020.25981

Cited by 4 publications

(3 citation statements)

References 42 publications

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“…Despite having advantages, including economic ones, DMBRs present instability in their practical application. In addition, parameters such as cell retention time (CRT), hydraulic retention time (HRT), extracellular polymeric substances (EPS), permeate flow, and the sludge morphological properties (sedimentation, dehydration, flocculability, and hydrophobicity)-which are functions of feed, temperature, and concentration of dissolved oxygen in the medium-can negatively affect the bioprocess if not strictly controlled [28][29] . However, one of the main disadvantages observed in membrane systems is the phenomenon called fouling, defined as the unwanted deposition of particles, colloids, macromolecules, and salts on the membrane surface (external fouling) and/or inside its pores (internal fouling), which causes the reduction of flow through the membrane, and consequently, a reduction in performance of the process 2, 31-32 .…”

Section: Dynamic Membrane Bioreactorsmentioning

confidence: 99%

“…Most studies have been carried out at bench and pilot scale, and although these systems have shown promising results comparable to systems using synthetic membrane bioreactors (commercial), research has generally been aimed at optimizing the operating conditions of bioreactors. Therefore, studies aiming, for example, at the elimination of pathogens and the recovery of products still need to be better investigated 8,11,17,[27][28]42 .…”

Section: Dynamic Membrane Bioreactorsmentioning

confidence: 99%

“…In this way, AnDMBR operation would have greater control in the medium and long term, and problems such as fouling could be avoided. Moreover, there are very few studies that evaluate biological parameters such as helminth eggs 27,28 .…”

Section: Performance Of Dynamic Membrane Anaerobic Bioreactor In Wast...mentioning

confidence: 99%

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Anaerobic dynamic membrane bioreactor applied to wastewater treatment: a review

et al. 2023

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Membrane bioreactors have been widely used in biological wastewater treatment. The membranes used in this type of technology are produced from organic or inorganic materials. However, membranes can also be formed from the deposition of solid particles, colloids, and polymeric materials, as well as microbial cells and flocs, on an inert support during the filtration process. When coupled to a bioreactor, they establish a unique system called a dynamic membrane bioreactor (DMBR). This type of bioreactor, while retaining the solids and microorganisms present in the system, removes both easy and difficult-to-degrade organic material, which reduces treatment costs and makes it advantageous compared to conventional membrane bioreactors (MBRs). In Brazil, this technology is relatively new and still little explored. Therefore, the present study aims to evaluate the DMBR's performance in anaerobic wastewater treatment systems. In addition to the advantages and disadvantages presented by this type of system compared to conventional MBRs (micro and ultrafiltration), the fouling phenomenon, its implications, and the theories that explain the formation of the dynamic layer are described. Finally, some challenges that still need to be overcome in the use of this technology are pointed out in order to be affirmed as a safe and robust tool for the biological treatment of domestic and industrial wastewater.

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Section: Dynamic Membrane Bioreactorsmentioning

confidence: 99%

Section: Dynamic Membrane Bioreactorsmentioning

confidence: 99%

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Anaerobic dynamic membrane bioreactor applied to wastewater treatment: a review

et al. 2023

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Advancements and challenges in membrane bioreactor performance for decentralized and low-temperature applications: A comprehensive review

Boleydei,

Vaneeckhaute

2024

Journal of Water Process Engineering

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Alkaline and acid solubilisation of waste activated sludge

Sousa

Monte

Silva

et al. 2021

Water Science and Technology

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The influence of acidic and alkaline conditions on the solubilisation process of waste activated sludge (WAS) was investigated using HCl and NaOH at pH 2, 10, 11 and 12. The rise in concentration of solubilised compounds, the influence of reaction time, and the influence of the concentration of total solids (TS) during the solubilisation process were determined. Physical and chemical tests demonstrated that pre-treatment provided a release of compounds from the sludge floc matrix into the soluble fraction, characterising the solubilisation process. The highest degree of WAS solubilisation was observed when a pH of 12 was applied. Although largest effects were already attained after 0.25 h, WAS solubilisation continued reaching an increase in total dissolved solids by a factor 10.4 after 720 hrs. Under these conditions, the dissolved organic carbon (DOC), proteins, and carbohydrates resulted in releases up to 15, 40 and 41 times, respectively; and phosphorus increased 5.7 times. Results indicate that by applying alkaline pre-treatment, higher TS concentrations can be treated per reactor volume compared to non-pre-treated WAS. Aerobic and anaerobic biodegradability tests showed increased bioconversion potentials in full-scale treatment plants. The respirometry tests ratify the improvement in solubilisation, with O2 consumption rates increasing 1.4 times, concomitant with an additional 261 mg·L−1 of the COD used, which represents 90% bioconversion of waste activated sludge. Biomethanisation test indicated an increase of 3.6 times relative to the blank.

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Decentralized treatment of domestic sewage in dynamic membrane bioreactor

Cited by 4 publications

References 42 publications

Anaerobic dynamic membrane bioreactor applied to wastewater treatment: a review

Anaerobic dynamic membrane bioreactor applied to wastewater treatment: a review

Advancements and challenges in membrane bioreactor performance for decentralized and low-temperature applications: A comprehensive review

Alkaline and acid solubilisation of waste activated sludge

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