Biological sulfide oxidation in an airlift bioreactor

Lohwacharin, Jenyuk; Annachhatre, Ajit P.

doi:10.1016/j.biortech.2009.10.093

Cited by 85 publications

(57 citation statements)

References 22 publications

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“…They also showed that the habitat of the SOB should be confined to the lower part of the headspace so as to improve operating conditions. Lohwacharin and Annachhatre (2010) investigated the successful operation of the biological sulfide oxidation process in an airlift biological reactor under oxygen-limited conditions and showed that up to 90% of sulfide removed was converted to elemental sulfur (S 2 O 2− 3 was the main by-product). Fortuny et al (2008) studied biotrickling filters with two different packing materials for the removal of ultra-high concentrations of H 2 S from oxygen-poor gases as an interesting alternative for the treatment of off-gases containing high concentrations of H 2 S. They found that optimization of packing and operating conditions could improve the process.…”

Section: H 2 S Removalmentioning

confidence: 99%

Biogas Management: Advanced Utilization for Production of Renewable Energy and Added-value Chemicals

Yentekakis

Goula

2017

Front. Environ. Sci.

100

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Biogas is widely available as a product of anaerobic digestion of urban, industrial, animal and agricultural wastes. Its indigenous local-base production offers the promise of a dispersed renewable energy source that can significantly contribute to regional economic growth. Biogas composition typically consists of 35-75% methane, 25-65% carbon dioxide, 1-5% hydrogen along with minor quantities of water vapor, ammonia, hydrogen sulfide and halides. Current utilization for heating and lighting is inefficient and polluting, and, in the case of poor quality biogas (CH 4 /CO 2 < 1), exacerbated by detrimental venting to the atmosphere. Accordingly, innovative and efficient strategies for improving the management and utilization of biogas for the production of sustainable electrical power or high added-value chemicals are highly desirable. Utilization is the focus of the present review in which the scientific and technological basis underlying alternative routes to the efficient and eco-friendly exploitation of biogas are described and discussed. After concisely reviewing state-of-the-art purification and upgrading methods, in-depth consideration is given to the exploitation of biogas in the renewable energy, liquid fuels, transport and chemicals sectors along with an account of potential impediments to further progress.Keywords: biogas, upgrading, purification, utilization, SOFC, ethylene, reforming, siloxanes BIOGAS Efficient management of ever-increasing amounts of municipal, industrial and agricultural wastes in order to minimize their environmental impact is an urgent necessity. Biological treatment of wastes, which can be carried out either aerobically or anaerobically, is widely applied in this area. Due to their several advantages the anaerobic processes are to be preferred because they require considerably smaller installations, produce less sludge, operate at lower temperatures and are suited to periodic operation. Much more importantly, they generate biogas, which is an attractive potential source of renewable energy and/or added-value chemicals due to its high content of methane and CO 2 . Anaerobic digestion (AD) can proceed over a wide temperature range, from phychrophilic (ca. 10-20 • C) and mesophilic (ca. 20-45 • C) up to thermophilic (ca. 45-65 • C) and hyperthermophilic (ca. ∼70 • C) levels, by means of cooperation between anaerobes and facultative anaerobe microorganisms, which successively promote a sequence of hydrolysis-acidogenesis,

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Section: H 2 S Removalmentioning

confidence: 99%

Biogas Management: Advanced Utilization for Production of Renewable Energy and Added-value Chemicals

Yentekakis

Goula

2017

Front. Environ. Sci.

100

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“…Limited oxygen supply to anaerobic reactors has been confirmed to have significant effects on the improvement of overall S 0 conversion efficiencies of bioreactors (Lohwacharin and Annachhatre, 2010). However, the S 0 conversion efficiencies of bioreactors decreased with the continuous increase of DO levels (Xu et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

“…It has been demonstrated that the sulfide oxidation process is regulated by the oxygen availability, and S 0 is the major final product (Janssen et al, 1995;Kobayashi et al, 2011). Biological sulfide control by introduction of limited amounts of oxygen/air into anaerobic systems has been extensively investigated in various reactors (Lohwacharin and Annachhatre, 2010;Sahinkaya et al, 2011;van der Zee et al, 2007), showing a high conversion efficiency of sulfide to S 0 . A conceptual process which integrates SRB and SOB in a single expanded granular sludge bed (EGSB) reactor has been operated under different micro-aerobic conditions (Xu et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Microbial community functional structure in response to micro-aerobic conditions in sulfate-reducing sulfur-producing bioreactor

Chen

et al. 2014

Journal of Environmental Sciences

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a b s t r a c tLimited oxygen supply to anaerobic wastewater treatment systems had been demonstrated as an effective strategy to improve elemental sulfur (S 0 ) recovery, coupling sulfate reduction and sulfide oxidation. However, little is known about the impact of dissolved oxygen (DO) on the microbial functional structures in these systems. We used a high throughput tool (GeoChip) to evaluate the microbial community structures in a biological desulfurization reactor under micro-aerobic conditions (DO: 0.02-0.33 mg/L). The results indicated that the microbial community functional compositions and structures were dramatically altered with elevated DO levels. The abundances of dsrA/B genes involved in sulfate reduction processes significantly decreased (p < 0.05, LSD test) at relatively high DO concentration (DO: 0.33 mg/L). The abundances of sox and fccA/B genes involved in sulfur/sulfide oxidation processes significantly increased (p < 0.05, LSD test) in low DO concentration conditions (DO: 0.09 mg/L) and then gradually decreased with continuously elevated DO levels. Their abundances coincided with the change of sulfate removal efficiencies and elemental sulfur (S 0 ) conversion efficiencies in the bioreactor. In addition, the abundance of carbon degradation genes increased with the raising of DO levels, showing that the heterotrophic microorganisms (e.g., fermentative microorganisms) were thriving under micro-aerobic condition. This study provides new insights into the impacts of micro-aerobic conditions on the microbial functional structure of sulfatereducing sulfur-producing bioreactors, and revealed the potential linkage between functional microbial communities and reactor performance.

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“…6 Sulfides in spent caustic oxidize biologically to produce sulfate as a result of complete oxidation and sulfur under limited oxygen. These processes are shown in the reactions equations below via: 5,7 HS -+ 2O 2 Membrane bioreactors (MBR) are known as common type of treatment for low and medium range concentration wastewater. However, only little study has been conducted on MBR treatment of high strength wastewater.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Membrane Bioreactor in Treating Spent Sulfidic Caustic Wastewater: Effects of Organic Biomass Concentration and Solid Retention Time

Mutamim

Noor²

2017

Chem. Eng. Res. Bull.

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This paper presents a study on the performance of an Aerobic Submerged u-shaped membrane bioreactor (ASMBR) in treating sulfidic spent caustic (SSC) in terms of mixed liquor suspended solid (MLSS) concentration and solid retention time (SRT). SSC wastewater is categorized as high strength wastewater and consists of high inorganic and organic matter. U-shape membrane bioreactors have a higher tendency to foul compared to other types of MBR. MLSS concentration and SRT are the major parameters when operating membrane bioreactor. In this study, COD removal recorded reduction of more than 95% for average MLSS concentration runs and 90% for SRTs runs. Meanwhile, sulfide was removed 99%, and formed up to 79% of sulfate. The biofouling for MLSS concentration and SRTs were observed through TMP rate change and TMP average performance, TMP trend and SMP and EPS trends. Biocake layer and biolayer deposited on membrane surface was found influenced by biomass, the inert particulate biomass products accumulating in the reactor.

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Biological sulfide oxidation in an airlift bioreactor

Cited by 85 publications

References 22 publications

Biogas Management: Advanced Utilization for Production of Renewable Energy and Added-value Chemicals

Biogas Management: Advanced Utilization for Production of Renewable Energy and Added-value Chemicals

Microbial community functional structure in response to micro-aerobic conditions in sulfate-reducing sulfur-producing bioreactor

Assessment of Membrane Bioreactor in Treating Spent Sulfidic Caustic Wastewater: Effects of Organic Biomass Concentration and Solid Retention Time

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