Simultaneous removal of ammonium from landfill leachate and hydrogen sulfide from biogas using a novel two-stage oxic-anoxic system

González-Cortés, José Joaquín; Almenglo, Fernando; Ramírez, Martín; Cantero, Domingo

doi:10.1016/j.scitotenv.2020.141664

Cited by 47 publications

(10 citation statements)

References 53 publications

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“…Its relative abundance increased to 13 ± 1% and 10 ± 1% in the MES reactor bulk phase and biocathode, respectively. It is a genus of strict anaerobic bacterium previously reported in biogas upgradation studies (González-Cortés et al, 2021). It has also been reported for acetic acid production under certain conditions (Sun et al, 2016).…”

Section: Microbial Community Datamentioning

confidence: 87%

Biogas Upgradation Through CO2 Conversion Into Acetic Acid via Microbial Electrosynthesis

2021

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Biogas is one of the promising futuristic renewable energy sources with enormous market potential. However, the presence of CO2 lowers down the calorific value of biogas. Hence, various biogas upgradation technologies are under intense investigation to increase the methane content to the desired level. This study reports on enhancing methane content in biogas through CO2 sequestration into acetic acid via microbial electrosynthesis (MES) process. The previously enriched mixed chemolithoautotrophic microbial culture dominated by Acetobacterium spp. used CO2 present in the biogas as the sole carbon source. After establishing a stable performing biocathode at a fixed cathodic potential of −1 V (vs. Ag/AgCl) through batch mode operation, biogas was fed continuously at different feed rates, viz., 0.5, 0.3, and 0.2 ml/min to the cathode chamber. The highest feed rate of 0.5 ml/min was least effective both for methane content increment (from 61 ± 3% to 86 ± 2%) and acetic acid titer (1.5 ± 0.5 g/L; 0.107 ± 0.02 g/L/d.). In comparison, the lowest flow rate of 0.2 ml/min was the most effective for the intended process (methane upgradation from 62 ± 7% to 93 ± 3% and acetic acid titer 3.4 ± 0.6 g/L produced at 0.24 ± 0.04 g/L/d rate). Both acetic acid bioproduction and biogas upgradation occurred best at an Ecell of 3.3 ± 0.35 V at the low feed rate. A maximum of 84 ± 7%, 57 ± 10% and 29 ± 2% coulombic, carbon and energetic efficiencies, respectively, were achieved in acetic acid. Cyclic voltammograms of biocathodes revealed the decrease in hydrogen evolution potential and increased bioelectrocatalysis, thereby suggesting the contribution of microbes in the process. Acetobacterium, which is known for CO2 fixation, was found to be the dominant microbial genus in biogas fed reactors. The demonstrated approach not only offers the advantage of obtaining two products, one in the bulk phase and the other in the off-gas, it also validates the applicability of the bioelectrochemical biogas upgradation technology.

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Section: Microbial Community Datamentioning

confidence: 87%

Biogas Upgradation Through CO2 Conversion Into Acetic Acid via Microbial Electrosynthesis

2021

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“…In experiment 4, a nitrifying bacterial culture was used. This culture was obtained from a laboratory continuous stirred tank bioreactor (CSTBR) operated for 354 days with a synthetic eluent (ammonium-rich water) [28].Two inoculation procedures were carried out:…”

Section: Experimental Conditionsmentioning

confidence: 99%

Influence of Leachate and Nitrifying Bacteria on Photosynthetic Biogas Upgrading in a Two-Stage System

et al. 2021

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Photosynthetic biogas upgrading using two-stage systems allows the absorption of carbon dioxide (CO2) in an absorption unit and its subsequent assimilation by microalgae. The production of microalgae requires large amounts of nutrients, thus making scale-up difficult and reducing economic feasibility. The photosynthetic process produces oxygen (O2) (1 mol per mol of CO2 consumed), which can be desorbed into purified biogas. Two-stage systems reduce its impact but do not eliminate it. In this study, we test the use of landfill leachate as a nutrient source and propose a viable and economical strategy for reducing the O2 concentration. First, the liquid/gas (L/G) ratio and flow mode of the absorber were optimized for 20% and 40% CO2 with COMBO medium, then landfill leachate was used as a nutrient source. Finally, the system was inoculated with nitrifying bacteria. Leachate was found to be suitable as a nutrient source and to result in a significant improvement in CO2 absorption, with outlet concentrations of 0.01% and 0.6% for 20% and 40% CO2, respectively, being obtained. The use of nitrifying bacteria allowed a reduction in dissolved oxygen (DO) concentration, although it also resulted in a lower pH, thus making CO2 uptake slightly more difficult.

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“…(M. Li et al, 2020) In addition to heavy metals, the toxicity of landfill leachate can be attributed to a wide variety of compounds present and high concentrations of ammoniacal nitrogen. This is an important pollutant, mainly due to the different oxidation states in which nitrogen is found and the favoring of the eutrophication process, which results in a decrease in dissolved oxygen in water (González-Cortés et al, 2021;Miranda et al, 2021). The high content of ammonia nitrogen makes water treatment more difficult.…”

Section: Removal Of Iron and Ammoniacalmentioning

confidence: 99%

“…In the literature, several methods are presented for the removal of ammoniacal nitrogen in leachate samples, for example, biological treatments with activated aerobic sludge, anaerobic digestion, air purging, ion exchange, coagulationflocculation, precipitation and adsorption techniques (González-Cortés et al, 2021;Miranda et al, 2021). However, there are no reports of the use of melamine-formaldehyde-silica-based composites, nor the use of cellulose from Mangifera indica pruning.…”

Section: Removal Of Iron and Ammoniacalmentioning

confidence: 99%

Melamine-formaldehyde-silica and melamine-silica-cellulose composites in removing Iron and N-ammonia from landfill leachate

Santos

Junior

Silva

et al. 2021

RSD

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Melamine-formaldehyde based composites are versatile and can be applied in the treatment of contaminated effluents such as landfill leachate that have a high pollutant load, as they are rich in nitrogen atoms, the sites allow interaction with molecules, atoms or ions of interest. Aiming compares the efficiency of two materials based on the same precursors, evaluating the efficiency of two composites, melamine-silica (PMF-Si) and melamine-silica-cellulose (Cel-M-Si) in removing iron and ammonia nitrogen in landfill leachate. Adsorption kinetics showed that PMF-Si and Cel-M-Si composites adsorb iron from 30 min, with an average removal of ~ 93.4%. Application of Cel-M-Si to removed leachate ca. 75.7% iron and 76.6% ammonia nitrogen. In contrast, it was observed that PMF-Si had a removal efficiency of 70.9% for iron and 55.0% for ammonia nitrogen. The comparative tests allowed to conclude that the composites PMF-Si and Cel-M-Si have potential for the treatment of landfill leachate, being low cost materials and easy synthesis.

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Simultaneous removal of ammonium from landfill leachate and hydrogen sulfide from biogas using a novel two-stage oxic-anoxic system

Cited by 47 publications

References 53 publications

Biogas Upgradation Through CO2 Conversion Into Acetic Acid via Microbial Electrosynthesis

Biogas Upgradation Through CO2 Conversion Into Acetic Acid via Microbial Electrosynthesis

Influence of Leachate and Nitrifying Bacteria on Photosynthetic Biogas Upgrading in a Two-Stage System

Melamine-formaldehyde-silica and melamine-silica-cellulose composites in removing Iron and N-ammonia from landfill leachate

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