The use of pure oxygen for aeration in aerobic wastewater treatment: A review of its potential and limitations

Skouteris, George; Rodriguez-García, Gonzalo; Reinecke, Sebastian Felix; Hampel, Uwe

doi:10.1016/j.biortech.2020.123595

Cited by 75 publications

(35 citation statements)

References 59 publications

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“…In this study, SAD m increased from 1.5 m 3 m −2 h in R‐SMBR just to 2.5 m 3 m −2 h in A‐SMBR. Although the energy usage for aeration in MBRs accounts for about 50% of the whole energy consumption, 50 increasing SAD m by 1 m 3 m −2 h does not have any considerable effects on the energy expenses – while electricity prices vary widely among countries, an increase of SAD m will utilize only 8670 m 3 air m −2 in a year. However, it has enormous effects on improving the pure PVC/PC membrane flux (up to 55%) and the removal efficiency of A‐SMBR.…”

Section: Resultsmentioning

confidence: 99%

Membrane fouling and removal performance of submerged aerobic membrane bioreactors: a comparative study of optimizing operational conditions and membrane modification

Oghyanous

Etemadi

Yegani

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND The effects of sludge retention time, organic loading rate, specific aeration demand per membrane area (SADm) and exploiting poly(vinyl chloride)/polycarbonate/modified silver nanoparticles (PVC/PC/MAg) nanocomposite membrane in membrane fouling and removal performance of submerged membrane bioreactors (SMBRs) were compared. A reference membrane bioreactor (R‐SMBR) having a pure PVC/PC hollow fiber membrane module and no operational condition improvement was used as a reference for comparison. RESULTS The results revealed that all of the parameters had a considerable influence on improving membrane fouling, among which optimizing SADm and installing nanocomposite membranes in the SMBRs had comparable performances. Although the nanocomposite membrane had excellent potential to boost the membrane flux up to 62% in comparison with the R‐SMBR, it did not play any noticeable roles in rectifying the removal efficiency of the SMBR. On the other hand, not only did SADm increase the membrane flux up to 55%, but it also increased about 5% of COD and 3% of NH4+‐N removal. CONCLUSIONS Sludge characteristics were not affected by membrane modification since the concentration of extracellular polymeric substances, soluble microbial products and mean particle size were 110 ± 1 mg g−1 VSS, 54 ± 1 mg L−1 and 50 μm, respectively, for both the R‐SMBR and the SMBR in which the modified membrane was installed. However, the operational parameters could also modify the treatment performance of the SMBRs by positively impacting on sludge characteristics besides mitigating membrane fouling. © 2021 Society of Chemical Industry (SCI).

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Section: Resultsmentioning

confidence: 99%

Membrane fouling and removal performance of submerged aerobic membrane bioreactors: a comparative study of optimizing operational conditions and membrane modification

Oghyanous

Etemadi

Yegani

et al. 2021

J of Chemical Tech & Biotech

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“…Wastewater treatment 90 [15] Fish farming 95 -Biogas upgrading (microbial H2S oxidation) 92 [16] Paper industry (delignification & bleaching) 92 [17] Fluid catalytic cracking (catalyst regeneration) 95 [18] Sulfur recovery unit (O2-based Claus process) 28 [19] Glass and ceramic furnace (oxyfuel combustion) 90 [20] Nitrox I&II OEA mixtures for minimizing risk for diver's decompression illness 32 & 36 [2] Limestone flue gas desulfurization (CaSO3 to CaSO4 oxidation) [21] Plasma cleaning of organic contaminants on surfaces [22] Plasma surface modification of polymers [23] H2O2 production [24] O2 HNO3 production production (NH3 to NO & NO to NO2 oxidation in Ostwald process) [25] Inerting for food maintenance 98…”

Section: Metal Welding 992 -mentioning

confidence: 99%

Membranes Targeting Industrial O2 Production from Air – A Short Review

S.¹,

P.²

2022

Int. J. Membrane Sci. Techno.

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Some of the most promising membranes for O2/N2 gas separation (air separation) mentioned in literature so far are selected, in terms of meeting a O2-gas-production breakeven cost that is lower than that of competing air separation unit (ASU) technologies, based on latest reported technoeconomic studies. An overview regarding most important applications of O2 and N2 gases is first given, in respect with the demanded purity limits for each case, since the purity parameter is crucial in defining the minimum breakeven cost.

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“…Electricity is their main energy source [4] and accounts for 25-50% of the operating costs of traditional activated sludge plants [5]. It has been estimated that WWTPs represent around 1% of the European Union's electricity consumption and up to 4% of the USA's [5].…”

Section: Introductionmentioning

confidence: 99%

“…This objective is generally attained by implementing the aerobic oxidation of the organic matter in activated sludge units. Conventional activated sludge units are one of the most widely used secondary treatment technologies [4]. This technology is well-mastered and efficient, even at very large scale, but it suffers from the high cost of supplying oxygen, because intensive aeration of wastewater is required to maintain the sludge particles in suspension, to sustain microbial growth, and to supply the microorganisms with the dissolved oxygen necessary to degrade the organic matter [8].…”

Section: Introductionmentioning

confidence: 99%