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Time course of the offline measurements of the total COD (a), soluble COD (b), volatile solids (c), sulfate (d), soluble hydrogen sulfide (e) and inorganic nitrogen (f) in the digester. Experimental data (circles), model simulation (continuous line).
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Microaeration can be used to cost-effectively remove in-situ H2S from the biogas generated in anaerobic digesters. This study is aimed at developing and validating an extension of the Anaerobic Digestion Model n°1 capable of incorporating the main phenomena which occurs during microaeration. This innovative model was implemented and tested with dat...
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... was in agreement with the average empirical concentrations measured ( Fig. 2c and d). However, the model was not able to reproduce the random H 2 S peaks observed during the period evaluated. Interestingly, those H 2 S peaks did not match any sudden rise in the sulfate inlet concentration or in soluble H 2 S concentrations in the digester broth (Fig. 3). Previous works have hypothesized that the biological oxidation of H 2 S may also occur in the headspace of the digester and in the superior layer of the anaerobic broth based on the high abundance of SOB bacteria recorded by the DGGE analysis [23]. A simple consider- ation of biomass retention was consequently proposed to partially ...
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... decreasing trends in total organic matter (measured as total COD and VS concentrations) observed up to day 115th as well as the slight bounce back from this day onwards were both properly represented by the model (Fig. 3a, c). Likewise, the simulation of the evolution of the soluble COD concentration was in agreement with the empirical values throughout the entire operational time (Fig. 3b). Likewise, the inorganic nitrogen concentration was also properly predicted by the model, thus validating the calibration of the stoichiometric parameters conducted in ...
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... matter (measured as total COD and VS concentrations) observed up to day 115th as well as the slight bounce back from this day onwards were both properly represented by the model (Fig. 3a, c). Likewise, the simulation of the evolution of the soluble COD concentration was in agreement with the empirical values throughout the entire operational time (Fig. 3b). Likewise, the inorganic nitrogen concentration was also properly predicted by the model, thus validating the calibration of the stoichiometric parameters conducted in the previous section. Fig. 3e also confirmed the ability of the ADM1 extension to describe the soluble H 2 S concentration in the anaerobic broth. In contrast, the ...
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... the simulation of the evolution of the soluble COD concentration was in agreement with the empirical values throughout the entire operational time (Fig. 3b). Likewise, the inorganic nitrogen concentration was also properly predicted by the model, thus validating the calibration of the stoichiometric parameters conducted in the previous section. Fig. 3e also confirmed the ability of the ADM1 extension to describe the soluble H 2 S concentration in the anaerobic broth. In contrast, the soluble sulfate concentration in the anaerobic broth was overpredicted and only matched when values were above 0.3 kmol L À1 , which were in agreement with the results reported by ...
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Citations
... It is worth mentioning that there is one more article reporting a micro-aeration in the selected set, by Donoso-Bravo and collaborators [60]. They tested air dosing on a 200 L pilot-scale system with the digestion of sanitary sludge. ...
Desulfurization is a critical process for biogas upgrading to biomethane, because hydrogen sulfide is toxic and corrosive. In this paper, we conduct a systematic review to check the most recent studies on desulfurization technologies and find trends, potentials, and limitations of each technique. The information of 51 articles published since 2015 was extracted, highlighting the maximum H2S removal efficiency, the highest inlet H2S
concentration studied, and the duration of the experiment. Only 23 papers studied raw biogas, and just 10 reported full-scale tests. Other researchers performed their studies with commercial gases and laboratory or bench scales. In addition, it became clear that tests were performed in different conditions, which was an obstacle to comparing them in the same data visualization. However, it was still possible to get insights, and overall the
highest efficiencies were observed in experiments with lower H2S concentrations. About 92% of the articles of this set report H2S removal efficiencies over 80%. The following tests stand out: a trickling filter system, biodesulfurization and bioscrubbing processes, a photocatalytic desulfurizer, and micro-aeration tests. Therefore, the present study has an overview of the most recent studies. After this process, it seems relevant to sort the
papers by test scale and gas type in future studies.
... The modelling of the microaeration process in AD has been done by extending the ADM1 to incorporate the biological oxidation of H2S to elemental sulfur by SOB. The developed model was calibrated using lab-scale data from anaerobic treatment of sulfate-rich wastewater (Donoso-Bravo et al., 2018;Pokorna-Krayzelova et al., 2017). ...
Sulfur is an often-overlooked but key element in water resource recovery facilities (WRRFs). It undergoes biological and physicochemical conversions in the prevailing unit processes, while its emission as hydrogen sulfide (H2S) may cause odour nuisance, corrosion and have adverse effects on biogas production. Despite its importance, little information is available concerning the fate of sulfur in WRRFs, notably when it comes to full-scale and plant-wide characterization. This doctoral research work presents advancements in our understanding of characterization of total sulfur flow and sulfur transformation during wastewater treatment processes of municipal WRRFs. First, a comprehensive literature review was performed to identify potential sulfur transformations within individual unit processes of municipal WRRFs. Sulfur mass flows in a full-scale WRRF were quantified on a plant-wide level, assessing liquid, sludge and gas streams simultaneously. Besides showing the distribution of sulfur flows, this result specified key sulfur flows, process treatments, and enabled a comparison of process treatment units. Next, the transformations of sulfur species were studied in both water and sludge treatment lines. Particular attention was given to fate of sulfur species during anaerobic digestion process and the influence of thermal hydrolysis, as a sludge pretreatment process, on the fate of sulfur species during anaerobic digestion. Both full-scale and lab-scale data were used for this purpose. Overall, this work improves our understanding of sulfur transformation in WRRFs, and in particular highlights the important role of organic sulfur conversion during anaerobic digestion process, which has been widely over-looked in literature.
... With the successful operation of the reactor, the continuous sparging of toluene-contaminated air finally reached a removal efficiency of 100%. Additionally, the genera Rhizobium, Pseudomonas, Burkholderia, Rhodobacter, Gemmobacter, Chitinophaga, Vampirovibrio, Fodinicurvata, Hyphomicrobium, Mycobacterium, Xanthobacter in aqueous systems were reported as dichloromethane, toluene or other VOC degraders as well (Dobslaw and Engesser, 2015;Wu et al., 2017;Xu et al., 2019). ...
... The developed model helped to better understand the procedure of elemental sulfur formation and identify the importance of S 2À /S0 cycles. Currently, although there are a few modeling papers describing microaeration for biogas desulfurization and DSR process (Donoso-Bravo et al., 2018;Xu et al., 2016), detailed modeling of AS processes in odor control and wastewater treatment is still lacking. The model analysis of biochemical and chemical deodorization process as well as the associated microbial pathways under different circumstances remain an important research gap. ...
Odors from wastewater treatment plants (WWTPs) have attracted extensive attention and stringent environmental standards are more widely adopted to reduce odor emissions. Biological odor treatment methods have broader applications than the physical and chemical counterparts as they are environment-friendly, cost-effective and generate low secondary wastes. The aqueous activated sludge (AS) processes are among the most promising approaches for the prevention or end-of-pipe removal of odor emissions and have the potential to simultaneously treat odor and wastewater. However, AS deodorization biotechnologies in WWTPs still need to be further systematically summarized and categorized while in-depth discussions on the characteristics and underlying mechanisms of AS deodorization process are still lacking. Recently, considerable studies have been reported to elucidate the microbial metabolisms in odor control and wastewater treatment. This paper reviews the fundamentals, characteristics, advances and field experiences of three AS biotechnologies for odor treatment in WWTPs, i.e., AS recycling, microaeration in AS digester and AS diffusion. The underlying deodorization mechanisms of typical odors have been revealed through the summary of recent advances on multi-element conversions, metabolic interactions of bacteria, microscopic characterization and identification of functional microorganisms. Future research aspects to advance the emerging deodorization AS process, such as deodorization mechanisms, simultaneous odor and water treatment, synergistic treatment with other air emissions, are discussed.
With the increased use of biogas generated from anaerobic digestion (AD) as a source of renewable energy, economical methods of cleaning and upgrading the gas are of growing importance. The removal of hydrogen sulfide to varying degrees is required regardless of the end biogas use, as the presence of hydrogen sulfide contributes to operations and maintenance costs and reduction in the life of gas handling equipment. Micro-aeration, or the injection of small amounts of oxygen, into anaerobic digesters has been shown to affect reduction in gaseous hydrogen sulfide concentrations and is more economical than typical sulfide scrubbing systems. This review examines the existing data on micro-aeration applications, including biological kinetics and appropriate control strategies for full-scale micro-aeration applications. Knowledge gaps in research are also noted.
Microaeration (dosing small quantities of air or oxygen) is an effective approach to facilitate anaerobic digestion (AD) process and has gained increased attention in recent years. The underlying mechanisms of the facilitation effect of microaeration on AD process were reviewed in terms of accelerating hydrolysis, scavenging hydrogen sulfide, and affecting microbial diversity. Process parameters and control strategies were summarized to reveal considerable factors in implementing microaeration-based AD process. In addition, current applications, including lab-, pilot- and full-scale level cases, were summarized to provide guidance for further improvement in large-scale applications. The challenges and future perspectives were also highlighted to promote the development of AD process associated with microaeration.
