Enrichment of salt-tolerant CO2–fixing communities in microbial electrosynthesis systems using porous ceramic hollow tube wrapped with carbon cloth as cathode and for CO2 supply

AlQahtani, Manal Faisal; Bajracharya, Suman; Katuri, Krishna P.; Ali, Muhammad; Xu, Jiajie; Alarawi, Mohammed; Saikaly, Pascal E.

doi:10.1016/j.scitotenv.2020.142668

Cited by 22 publications

(18 citation statements)

References 60 publications

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“…Genomic DNA extraction, DNA amplification, and sequencing were performed according to the protocol in a previous study (Alqahtani et al, 2021). Operational taxonomic unit (OTU) abundance was estimated at 97 identities using the usearch (v. 7.0.1090-usearch_global) (Bian et al, 2021).…”

Section: Microbial Community Analysismentioning

confidence: 99%

“…The composition of carboxylic acids and ethanol was determined with a gas chromatograph (GC) (6890A Series, Agilent Technologies Inc., United States) as described previously (Usack and Angenent, 2015). The concentrations of methane, carbon dioxide, and hydrogen in the biogas were measured weekly using a GC (module 310C; SRI Instruments, United States) as previously described (Alqahtani et al, 2021). Detailed information on the calculations is provided in the Supporting Information (Supplementary Eqs 1-4).…”

Section: Liquid Sampling Analytical Procedures and Calculationsmentioning

confidence: 99%

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Long-Term Continuous Extraction of Medium-Chain Carboxylates by Pertraction With Submerged Hollow-Fiber Membranes

Bian

Angenent

et al. 2021

Front. Bioeng. Biotechnol.

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Medium-chain carboxylic acids (MCCAs), which can be generated from organic waste and agro-industrial side streams through microbial chain elongation, are valuable chemicals with numerous industrial applications. Membrane-based liquid-liquid extraction (pertraction) as a downstream separation process to extract MCCAs has been applied successfully. Here, a novel pertraction system with submerged hollow-fiber membranes in the fermentation bioreactor was applied to increase the MCCA extraction rate and reduce the footprint. The highest average surface-corrected MCCA extraction rate of 655.2 ± 86.4 mmol C m−2 d−1 was obtained, which was higher than any other previous reports, albeit the relatively small surface area removed only 11.6% of the introduced carbon via pertraction. This submerged extraction system was able to continuously extract MCCAs with a high extraction rate for more than 8 months. The average extraction rate of MCCA by internal membrane was 3.0- to 4.7-fold higher than the external pertraction (traditional pertraction) in the same bioreactor. A broth upflow velocity of 7.6 m h−1 was more efficient to extract MCCAs when compared to periodic biogas recirculation operation as a means to prevent membrane fouling. An even higher broth upflow velocity of 40.5 m h−1 resulted in a significant increase in methane production, losing more than 30% of carbon conversion to methane due to a loss of H2, and a subsequent drop in the H2 partial pressure. This resulted in the shift from a microbial community with chain elongators as the key functional group to methanogens, because the drop in H2 partial pressure led to thermodynamic conditions that oxidizes ethanol and carboxylic acids to acetate and H2 with methanogens as the syntrophic partner. Thus, operators of chain elongating systems should monitor the H2 partial pressure when changes in operating conditions are made.

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Section: Microbial Community Analysismentioning

confidence: 99%

Section: Liquid Sampling Analytical Procedures and Calculationsmentioning

confidence: 99%

Long-Term Continuous Extraction of Medium-Chain Carboxylates by Pertraction With Submerged Hollow-Fiber Membranes

Bian

Angenent

et al. 2021

Front. Bioeng. Biotechnol.

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“…Marinobacter was assumed to consume fixed carbon in this system, thus relating to the low VFA production [ 19 ]. Another study further examined MES performance at the salinity of 3.5% using salt marshes and mangrove sediments as inocula together with synthetic red seawater as catholyte at the same cathode potential [ 20 ]. This prior work used a porous ceramic hollow tube wrapped with carbon cloth as the cathode with a large projected area of 110 cm 2 for direct CO 2 delivery and minimizing CO 2 mass transfer limitation.…”

Section: Introductionmentioning

confidence: 99%

“…This prior work used a porous ceramic hollow tube wrapped with carbon cloth as the cathode with a large projected area of 110 cm 2 for direct CO 2 delivery and minimizing CO 2 mass transfer limitation. A higher titer was subsequently obtained, but the production rates remained low at 1.69 g m −2 d −1 for acetic acid and 0.55 g m −2 d −1 for methane after a 10-day batch operation, while the reduction current also decreased over time [ 20 ]. During these trials, Acetobacterium belonging to the phylum Firmicutes exhibited unstable enrichment, which was likely related to the low acetate production rate [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Microbial electrosynthesis of acetate from CO2 under hypersaline conditions

Zhang

Arbour

Zhang

et al. 2023

Environmental Science and Ecotechnology

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“…Some countries in Southeast Asia including Indonesia have long coastlines which concrete structures located in a hot and humid climate zone tends to deteriorate from the corrosion of the reinforcement by airborne chloride [35][36][37]. Even the sacrificial anodes cathodic protection is considered as the most effective and widely used in controlling chlorideinduced reinforcement corrosion [28,38,39]; however, the sacrificial anodes cathodic protection can lose its effectiveness with time due to the anode consumption during repair period [1]. The anode life is dependent on the average current output that affected by temperature, oxygen content, humidity and chloride content [40].…”

Section: Introductionmentioning

confidence: 99%

Effective Use of Sacrificial Zinc Anode as a Suitable Repair Method for Severely Damaged RC Members Due to Chloride Attack

Astuti

Rafdinal²,

Yamamoto

et al. 2022

Civ Eng J

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In many cases, the repair strategy by using sacrificial anodes for cathodic protection in real RC structures requires additional zinc anodes after several years due to the decreasing protective area. This experimental study evaluates the effectiveness of time lag application of sacrificial anode cathodic protection applied to RC beam specimens that deteriorated severely due to chloride attack. In the experiment, sacrificial anodes and cathodic protection (SACP) were applied to 41-year-old RC beam specimens exposed to natural marine environments in which the embedded steel bars were significantly corroded. The repair work was performed in three stages. Instant-off and rest potential tests of steel bars were conducted periodically to demonstrate the time-dependent depolarization value. In the first stage, a polymer-modified mortar as a patch repair material was cast to replace the concrete in the middle tensile part with small sacrificial anodes embedded in the mortar. After the protective current reaches an equilibrium state, the sacrificial anodes are disconnected from the steel bars for a year, defined as the second stage. During the one year in the second stage, the steel bar in the patch repair area remained passive, without any sign of corrosion. As for the third stage, additional sacrificial anodes were installed in the existing concrete part to protect the steel in it. From one year of observation after applying sacrificial anodes to old concrete parts, the time lag SACP application of both in patch and non-patch repair parts was clarified to be effective in stopping the corrosion of steel bar in both parts until 20–30 years based on the service life prediction. Doi: 10.28991/CEJ-2022-08-07-015 Full Text: PDF

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Enrichment of salt-tolerant CO2–fixing communities in microbial electrosynthesis systems using porous ceramic hollow tube wrapped with carbon cloth as cathode and for CO2 supply

Cited by 22 publications

References 60 publications

Long-Term Continuous Extraction of Medium-Chain Carboxylates by Pertraction With Submerged Hollow-Fiber Membranes

Long-Term Continuous Extraction of Medium-Chain Carboxylates by Pertraction With Submerged Hollow-Fiber Membranes

Microbial electrosynthesis of acetate from CO2 under hypersaline conditions

Effective Use of Sacrificial Zinc Anode as a Suitable Repair Method for Severely Damaged RC Members Due to Chloride Attack

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