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Torres-Herrera S, Palomares-Cortés J, González-Cortés JJ, Cubides-Páez DF, Gamisans X, Cantero D, Ramírez M. Biodesulfurization of landfill biogas by a pilot-scale bioscrubber: Operational limits and microbial analysis. ENVIRONMENTAL RESEARCH 2024; 246:118164. [PMID: 38211717 DOI: 10.1016/j.envres.2024.118164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2023] [Revised: 01/07/2024] [Accepted: 01/08/2024] [Indexed: 01/13/2024]
Abstract
Biogas serves as a crucial renewable energy vector to ensure a more sustainable energy future. However, the presence of hydrogen sulfide (H2S) limits its application in various sectors, emphasizing the importance of effective H2S removal techniques for maximizing its potential. In the present study, the limits of a pilot-scale bioscrubber for biogas desulfurization was study in a real scenario. An increase in the superficial liquid velocity resulted in significant improvements in the H2S removal efficiency, increasing from 76 ± 8% (elimination capacity of 6.2 ± 0.5 gS-H2S m-3 h-1) to 97.7 ± 0.5% (elimination capacity of 8 ± 1 gS-H2S m-3 h-1) as the superficial liquid velocity increased from 50 ± 3 m h-1 to 200 ± 8 m h-1. A USL of 161.4 ± 0.5 m h-1 was able to achieve outlet H2S concentrations as low as 3 ± 1 ppmv (H2S removal efficiency of 97 ± 1%) for 7 days. High superficial liquid velocity favoured the aerobic H2S oxidation reducing the nitrate demand. The maximum EC reached throughout the operation was 50.8 ± 0.6 gS-H2S m-3 h-1 (H2S removal efficiency of 96 ± 1%) and a sulfur production of 60%. Studies in batch flocculation experiments showed sulfur removal rates up to 97.6 ± 0.9% with a cationic flocculant dose of 75 mg L-1. Microbial analysis revealed that the predominant genus with sulfo-oxidant capacity during periods of low H2S inlet load was Thioalkalispira-sulfurivermis (61-69%), while in periods of higher H2S inlet load, family Arcobacteraceae was the most prevalent (11%).
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Affiliation(s)
- S Torres-Herrera
- Department of Chemical Engineering and Food Technologies, Wine and Agrifood Research Institute (IVAGRO). Faculty of Sciences, University of Cadiz, Puerto Real, Cadiz, 11510, Spain
| | - J Palomares-Cortés
- Department of Chemical Engineering and Food Technologies, Wine and Agrifood Research Institute (IVAGRO). Faculty of Sciences, University of Cadiz, Puerto Real, Cadiz, 11510, Spain
| | - J J González-Cortés
- Department of Chemical Engineering and Food Technologies, Wine and Agrifood Research Institute (IVAGRO). Faculty of Sciences, University of Cadiz, Puerto Real, Cadiz, 11510, Spain
| | - D F Cubides-Páez
- Eurecat, Centre Tecnològic de Catalunya, Sustainability Area, Plaça de la Ciencia 2, Manresa, Barcelona, 08242, Spain
| | - X Gamisans
- Department of Mining, Industrial and ICT Engineering, Manresa School of Engineering, Universitat Politècnica de Catalunya, Manresa, Barcelona, 08242, Spain
| | - D Cantero
- Department of Chemical Engineering and Food Technologies, Wine and Agrifood Research Institute (IVAGRO). Faculty of Sciences, University of Cadiz, Puerto Real, Cadiz, 11510, Spain
| | - M Ramírez
- Department of Chemical Engineering and Food Technologies, Wine and Agrifood Research Institute (IVAGRO). Faculty of Sciences, University of Cadiz, Puerto Real, Cadiz, 11510, Spain.
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2
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Manikandan S, Vickram S, Subbaiya R, Karmegam N, Woong Chang S, Ravindran B, Kumar Awasthi M. Comprehensive review on recent production trends and applications of biochar for greener environment. BIORESOURCE TECHNOLOGY 2023; 388:129725. [PMID: 37683709 DOI: 10.1016/j.biortech.2023.129725] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 08/21/2023] [Accepted: 09/05/2023] [Indexed: 09/10/2023]
Abstract
The suitability of biochar as a supplement for environmental restoration varies significantly based on the type of feedstocks used and the parameters of the pyrolysis process. This study comprehensively examines several aspects of biochar's potential benefits, its capacity to enhance crop yields, improve nutrient availability, support the co-composting, water restoration and enhance overall usage efficiency. The supporting mechanistic evidence for these claims is also evaluated. Additionally, the analysis identifies various gaps in research and proposes potential directions for further exploration to enhance the understanding of biochar application. As a mutually advantageous approach, the integration of biochar into agricultural contexts not only contributes to environmental restoration but also advances ecological sustainability. The in-depth review underscores the diverse suitability of biochar as a supplement for environmental restoration, contingent upon the specific feedstock sources and pyrolysis conditions used. However, concerns have been raised regarding potential impacts on human health within agricultural sectors.
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Affiliation(s)
- Sivasubramanian Manikandan
- Department of Biotechnology, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences (SIMATS), Thandalam, Chennai 602 105. Tamil Nadu, India
| | - Sundaram Vickram
- Department of Biotechnology, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences (SIMATS), Thandalam, Chennai 602 105. Tamil Nadu, India
| | - Ramasamy Subbaiya
- Department of Biological Sciences, School of Mathematics and Natural Sciences, The Copperbelt University, Riverside, Jambo Drive, P O Box 21692 Kitwe, Zambia
| | - Natchimuthu Karmegam
- PG and Research Department of Botany, Government Arts College (Autonomous), Salem 636 007, Tamil Nadu, India
| | - Soon Woong Chang
- Department of Environmental Energy and Engineering, Kyonggi University Yeongtong-Gu, Suwon, Gyeonggi-Do 16227, Republic of Korea
| | - Balasubramani Ravindran
- Department of Medical Biotechnology and Integrative Physiology, Institute of Biotechnology, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Thandalam, Chennai, 602105, Tamil Nadu, India; Department of Environmental Energy and Engineering, Kyonggi University Yeongtong-Gu, Suwon, Gyeonggi-Do 16227, Republic of Korea
| | - Mukesh Kumar Awasthi
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, China.
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Ghosh P, Stauffer M, Ahmed ME, Bertke JA, Staples RJ, Warren TH. Thiol and H 2S-Mediated NO Generation from Nitrate at Copper(II). J Am Chem Soc 2023; 145:12007-12012. [PMID: 37224264 PMCID: PMC10367543 DOI: 10.1021/jacs.3c00394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Reduction of nitrate is an essential, yet challenging chemical task required to manage this relatively inert oxoanion in the environment and biology. We show that thiols, ubiquitous reductants in biology, convert nitrate to nitric oxide at a Cu(II) center under mild conditions. The β-diketiminato complex [Cl2NNF6]Cu(κ2-O2NO) engages in O-atom transfer with various thiols (RSH) to form the corresponding copper(II) nitrite [CuII](κ2-O2N) and sulfenic acid (RSOH). The copper(II) nitrite further reacts with RSH to give S-nitrosothiols RSNO and [CuII]2(μ-OH)2 en route to NO formation via [CuII]-SR intermediates. The gasotransmitter H2S also reduces nitrate at copper(II) to generate NO, providing a lens into NO3-/H2S crosstalk. The interaction of thiols with nitrate at copper(II) releases a cascade of N- and S-based signaling molecules in biology.
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Affiliation(s)
- Pokhraj Ghosh
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
- Department of Chemistry, Georgetown University, Box 571227-1227, Washington, D. C. 20057, United States
| | - Molly Stauffer
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
- Department of Chemistry, Georgetown University, Box 571227-1227, Washington, D. C. 20057, United States
| | - Md Estak Ahmed
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
- Department of Chemistry, Georgetown University, Box 571227-1227, Washington, D. C. 20057, United States
| | - Jeffery A Bertke
- Department of Chemistry, Georgetown University, Box 571227-1227, Washington, D. C. 20057, United States
| | - Richard J Staples
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Timothy H Warren
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
- Department of Chemistry, Georgetown University, Box 571227-1227, Washington, D. C. 20057, United States
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4
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Almenglo F, González-Cortés JJ, Ramírez M, Cantero D. Recent advances in biological technologies for anoxic biogas desulfurization. CHEMOSPHERE 2023; 321:138084. [PMID: 36775028 DOI: 10.1016/j.chemosphere.2023.138084] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 01/11/2023] [Accepted: 02/05/2023] [Indexed: 06/18/2023]
Abstract
Recovery of the energy contained in biogas will be essential in coming years to reduce greenhouse gas emissions and our current dependence on fossil fuels. The elimination of H2S is a priority to avoid equipment corrosion, poisoning of catalytic systems and SO2 emissions in combustion engines. This review describes the advances made in this technology using fixed biomass bioreactors (FBB) and suspended growth bioreactors (SGB) since the first studies in this field in 2008. Anoxic desulfurization has been studied mainly in biotrickling filters (BTF). Elimination capacities (EC) up to 287 gS m-3 h-1 have been achieved, with a removal efficiency (RE) of 99%. Both nitrate and nitrite have been successfully used as electron acceptor. SGBs can solve some operational problems present in FBBs, such as clogging or nutrient distribution issues. However, they present greater difficulties in gas-liquid mass transfer, although ECs of up to 194 gS m-3 h-1 have been reported in both gas-lift and stirred tank reactors. One of the major disadvantages of using anoxic biodesulfurization compared to aerobic biodesulfurization is the need to provide reagents (nitrates and/or nitrites), with the consequent increase in operating costs. A solution proposed in this respect is the use of nitrified effluents, some ammonium-rich effluents nitrified include landfill leachate and digested effluent from the anaerobic digester have been tested successfully. Among the microbial diversity found in the bioreactors, the genera Thiobacillus, Sulfurimonas and Sedimenticola play a key role in anoxic removal of H2S. Finally, a summary of future trends in technology is provided.
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Affiliation(s)
- F Almenglo
- Department of Chemical Engineering and Food Technologies, Wine and Agrifood Research Institute (IVAGRO), Faculty of Sciences, University of Cadiz, 11510, Puerto Real, Cádiz, Spain
| | - J J González-Cortés
- Department of Chemical Engineering and Food Technologies, Wine and Agrifood Research Institute (IVAGRO), Faculty of Sciences, University of Cadiz, 11510, Puerto Real, Cádiz, Spain
| | - M Ramírez
- Department of Chemical Engineering and Food Technologies, Wine and Agrifood Research Institute (IVAGRO), Faculty of Sciences, University of Cadiz, 11510, Puerto Real, Cádiz, Spain.
| | - D Cantero
- Department of Chemical Engineering and Food Technologies, Wine and Agrifood Research Institute (IVAGRO), Faculty of Sciences, University of Cadiz, 11510, Puerto Real, Cádiz, Spain
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Sempere F, Sánchez C, Baeza-Serrano Á, Montoya T. Anoxic desulphurisation of biogas from full-scale anaerobic digesters in suspended biomass bioreactors valorising previously nitrified digestate centrate. JOURNAL OF HAZARDOUS MATERIALS 2022; 439:129641. [PMID: 35882172 DOI: 10.1016/j.jhazmat.2022.129641] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 07/06/2022] [Accepted: 07/18/2022] [Indexed: 06/15/2023]
Abstract
Nitrification of centrate from anaerobic sewage sludge digestion presents a major opportunity as an electron acceptor in anoxic biogas biodesulphurisation. Nitritation and nitrification inhibition by free ammonia was detected at laboratory scale, but was avoided during the scale-up operation in a 4 m3 reactor treating ammonium loads up to 19 gN m-3 h-1. This nitrate-rich stream was fed to two pilot-scale suspended biomass bioreactors (SBBs) treating real biogas for 220 days. After an adaptation period of 21 days, nitrate and alkalinity concentrations in the liquid medium below 10 mgN L-1 and 100 mgCaCO3 L-1 were found to limit hydrogen sulphide (H2S) oxidation. Once controlled, 95% of the H2S was removed in SBB1 and 90% in SBB2, at a gas residence time (GRT) of 5.9 min, treating average values of 321 ± 205 ppmv and 457 ± 205 ppmv, respectively. Outlet H2S concentrations of 16 ± 24 ppmv in SBB1 and 46 ± 39 ppmv in SBB2 were obtained, which are below the requirements of biogas combustion heat and power engines. Unlike H2S, siloxanes were not removed with these GRTs. The results demonstrate the feasibility of the combined process for H2S treatment, potential valorisation of precipitated elemental sulphur and a reduction in the reagents currently used to control H2S.
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Affiliation(s)
- Feliu Sempere
- Global Omnium Medioambiente, S.L., Gran Via Marqués del Túria 19, 46005 València, Spain.
| | - Camino Sánchez
- Global Omnium Medioambiente, S.L., Gran Via Marqués del Túria 19, 46005 València, Spain
| | - Ángela Baeza-Serrano
- Global Omnium Medioambiente, S.L., Gran Via Marqués del Túria 19, 46005 València, Spain
| | - Tatiana Montoya
- Global Omnium Medioambiente, S.L., Gran Via Marqués del Túria 19, 46005 València, Spain
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6
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Deena SR, Vickram AS, Manikandan S, Subbaiya R, Karmegam N, Ravindran B, Chang SW, Awasthi MK. Enhanced biogas production from food waste and activated sludge using advanced techniques - A review. BIORESOURCE TECHNOLOGY 2022; 355:127234. [PMID: 35489575 DOI: 10.1016/j.biortech.2022.127234] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 04/21/2022] [Accepted: 04/23/2022] [Indexed: 06/14/2023]
Abstract
Biogas generation using food waste anaerobic co-digestion with activated sludge provides a cleaner addressable system, an excellent solution to global challenges, the increasing energy demands, fuel charges, pollution and wastewater treatment. Regardless of the anaerobic digestate end product values, the technology lacks efficiency and process instability due to substrate irregularities. Process parameters and substrate composition, play a vital role in the efficiency and outcome of the system. Intrinsic biochar properties such as pore size, specific surface properties and cation exchange capacity make it an ideal additive that enriches microbial functions and enhances anaerobic digestion. The pretreatment and co-digestion of food waste and activated sludge are found to be significant for efficient biogas generation. The advantages, drawbacks, limitations, and technical improvements are covered extensively in the present review besides the recent advancement in the anaerobic digestion system.
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Affiliation(s)
- Santhana Raj Deena
- College of Natural Resources and Environment, Northwest A&F University, TaichengRoad3# Shaanxi, Yangling 712100, China; Department of Biotechnology, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha Nagar, Thandalam, Chennai 602 105. Tamil Nadu, India
| | - A S Vickram
- Department of Biotechnology, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha Nagar, Thandalam, Chennai 602 105. Tamil Nadu, India
| | - S Manikandan
- Department of Biotechnology, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha Nagar, Thandalam, Chennai 602 105. Tamil Nadu, India
| | - R Subbaiya
- Department of Biological Sciences, School of Mathematics and Natural Sciences, The Copperbelt University, Riverside, Jambo Drive, P O Box 21692, Kitwe, Zambia
| | - N Karmegam
- Department of Botany, Government Arts College (Autonomous), Salem 636007, Tamil Nadu, India
| | - Balasubramani Ravindran
- Department of Environmental Energy and Engineering, Kyonggi University, Youngtong-Gu, Suwon, Gyeonggi-Do 16227, South Korea
| | - Soon Woong Chang
- Department of Environmental Energy and Engineering, Kyonggi University, Youngtong-Gu, Suwon, Gyeonggi-Do 16227, South Korea
| | - Mukesh Kumar Awasthi
- College of Natural Resources and Environment, Northwest A&F University, TaichengRoad3# Shaanxi, Yangling 712100, China.
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7
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Peh S, Mu T, Zhong W, Yang M, Chen Z, Yang G, Zhao X, Sharshar MM, Samak NA, Xing J. Enhanced Biodesulfurization with a Microbubble Strategy in an Airlift Bioreactor with Haloalkaliphilic Bacterium Thioalkalivibrio versutus D306. ACS OMEGA 2022; 7:15518-15528. [PMID: 35571827 PMCID: PMC9096976 DOI: 10.1021/acsomega.2c00258] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 03/31/2022] [Indexed: 05/05/2023]
Abstract
Biodesulfurization under haloalkaline conditions requires limiting oxygen and additional energy in the system to deliver high mixing quality control. This study considers biodesulfurization in an airlift bioreactor with uniform microbubbles generated by a fluidic oscillation aeration system to enhance the biological desulfurization process and its hydrodynamics. Fluidic oscillation aeration in an airlift bioreactor requires minimal energy input for microbubble generation. This aeration system produced 81.87% smaller average microbubble size than the direct aeration system in a bubble column bioreactor. The biodesulfurization phase achieved a yield of 94.94% biological sulfur, 84.91% biological sulfur selectivity, and 5.06% sulfur oxidation performance in the airlift bioreactor with the microbubble strategy. The biodesulfurization conditions of thiosulfate via Thioalkalivibrio versutus D306 are revealed in this study. The biodesulfurization conditions in the airlift bioreactor with the fluidic oscillation aeration system resulted in the complete conversion of thiosulfate with 27.64% less sulfate production and 10.34% more biological sulfur production than in the bubble column bioreactor. Therefore, pleasant hydrodynamics via an airlift bioreactor mechanism with microbubbles is favored for biodesulfurization under haloalkaline conditions.
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Affiliation(s)
- Sumit Peh
- CAS
Key Laboratory of Green Process and Engineering, State Key Laboratory
of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences (CAS), Beijing 100190, China
- College
of Chemical Engineering, University of Chinese
Academy of Sciences, Beijing 100049, P.R. China
| | - Tingzhen Mu
- CAS
Key Laboratory of Green Process and Engineering, State Key Laboratory
of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences (CAS), Beijing 100190, China
| | - Wei Zhong
- CAS
Key Laboratory of Green Process and Engineering, State Key Laboratory
of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences (CAS), Beijing 100190, China
- College
of Chemical Engineering, University of Chinese
Academy of Sciences, Beijing 100049, P.R. China
| | - Maohua Yang
- CAS
Key Laboratory of Green Process and Engineering, State Key Laboratory
of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences (CAS), Beijing 100190, China
| | - Zheng Chen
- CAS
Key Laboratory of Green Process and Engineering, State Key Laboratory
of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences (CAS), Beijing 100190, China
- College
of Chemical Engineering, University of Chinese
Academy of Sciences, Beijing 100049, P.R. China
| | - Gama Yang
- CAS
Key Laboratory of Green Process and Engineering, State Key Laboratory
of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences (CAS), Beijing 100190, China
- College
of Chemical Engineering, University of Chinese
Academy of Sciences, Beijing 100049, P.R. China
| | - Xuhao Zhao
- CAS
Key Laboratory of Green Process and Engineering, State Key Laboratory
of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences (CAS), Beijing 100190, China
- College
of Chemical Engineering, University of Chinese
Academy of Sciences, Beijing 100049, P.R. China
| | - Moustafa Mohamed Sharshar
- CAS
Key Laboratory of Green Process and Engineering, State Key Laboratory
of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences (CAS), Beijing 100190, China
- College
of Chemical Engineering, University of Chinese
Academy of Sciences, Beijing 100049, P.R. China
| | - Nadia A. Samak
- CAS
Key Laboratory of Green Process and Engineering, State Key Laboratory
of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences (CAS), Beijing 100190, China
- College
of Chemical Engineering, University of Chinese
Academy of Sciences, Beijing 100049, P.R. China
- Processes
Design and Development Department, Egyptian
Petroleum Research Institute, Nasr
City 11727, Cairo, Egypt
| | - Jianmin Xing
- CAS
Key Laboratory of Green Process and Engineering, State Key Laboratory
of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences (CAS), Beijing 100190, China
- College
of Chemical Engineering, University of Chinese
Academy of Sciences, Beijing 100049, P.R. China
- Chemistry
and Chemical Engineering Guangdong Laboratory, Shantou 515031, P.R. China
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8
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Chan-Pacheco CR, Valenzuela EI, Cervantes FJ, Quijano G. Novel biotechnologies for nitrogen removal and their coupling with gas emissions abatement in wastewater treatment facilities. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 797:149228. [PMID: 34346385 DOI: 10.1016/j.scitotenv.2021.149228] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 07/16/2021] [Accepted: 07/20/2021] [Indexed: 06/13/2023]
Abstract
Wastewaters contaminated with nitrogenous pollutants, derived from anthropogenic activities, have exacerbated our ecosystems sparking environmental problems, such as eutrophication and acidification of water reservoirs, emission of greenhouse gases, death of aquatic organisms, among others. Wastewater treatment facilities (WWTF) combining nitrification and denitrification, and lately partial nitrification coupled to anaerobic ammonium oxidation (anammox), have traditionally been applied for the removal of nitrogen from wastewaters. The present work provides a comprehensive review of the recent biotechnologies developed in which nitrogen-removing processes are relevant for the treatment of both wastewaters and gas emissions. These novel processes include the anammox process with alternative electron acceptors, such as sulfate (sulfammox), ferric iron (feammox), and anodes in microbial electrolysis cells (anodic anammox). New technologies that couple nitrate/nitrite reduction with the oxidation of methane, H2S, volatile methyl siloxanes, and other volatile organic compounds are also described. The potential of these processes for (i) minimizing greenhouse gas emissions from WWTF, (ii) biogas purification, and (iii) air pollution control is critically discussed considering the factors that might trigger N2O release during nitrate/nitrite reduction. Moreover, this review provides a discussion on the main challenges to tackle towards the consolidation of these novel biotechnologies.
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Affiliation(s)
- Carlos R Chan-Pacheco
- Laboratory for Research on Advanced Processes for Water Treatment, Engineering Institute, Campus Juriquilla, Universidad Nacional Autónoma de México (UNAM), Blvd. Juriquilla 3001, 76230 Querétaro, Mexico
| | - Edgardo I Valenzuela
- Laboratory for Research on Advanced Processes for Water Treatment, Engineering Institute, Campus Juriquilla, Universidad Nacional Autónoma de México (UNAM), Blvd. Juriquilla 3001, 76230 Querétaro, Mexico
| | - Francisco J Cervantes
- Laboratory for Research on Advanced Processes for Water Treatment, Engineering Institute, Campus Juriquilla, Universidad Nacional Autónoma de México (UNAM), Blvd. Juriquilla 3001, 76230 Querétaro, Mexico.
| | - Guillermo Quijano
- Laboratory for Research on Advanced Processes for Water Treatment, Engineering Institute, Campus Juriquilla, Universidad Nacional Autónoma de México (UNAM), Blvd. Juriquilla 3001, 76230 Querétaro, Mexico.
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Zhang M, Xue Q, Zhang S, Zhou H, Xu T, Zhou J, Zheng Y, Li M, Kumar S, Zhao D, Xiang H. Development of whole-cell catalyst system for sulfide biotreatment based on the engineered haloalkaliphilic bacterium. AMB Express 2021; 11:142. [PMID: 34693461 PMCID: PMC8542531 DOI: 10.1186/s13568-021-01302-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 10/12/2021] [Indexed: 11/10/2022] Open
Abstract
Microorganisms play an essential role in sulfide removal. Alkaline absorption solution facilitates the sulfide’s dissolution and oxidative degradation, so haloalkaliphile is a prospective source for environmental-friendly and cost-effective biodesulfurization. In this research, 484 sulfide oxidation genes were identified from the metagenomes of the soda-saline lakes and a haloalkaliphilic heterotrophic bacterium Halomonas salifodinae IM328 (=CGMCC 22183) was isolated from the same habitat as the host for expression of a representative sequence. The genetic manipulation was successfully achieved through the conjugation transformation method, and sulfide: quinone oxidoreductase gene (sqr) was expressed via pBBR1MCS derivative plasmid. Furthermore, a whole-cell catalyst system was developed by using the engineered strain that exhibited a higher rate of sulfide oxidation under the optimal alkaline pH of 9.0. The whole-cell catalyst could be recycled six times to maintain the sulfide oxidation rates from 41.451 to 80.216 µmol·min−1·g−1 dry cell mass. To summarize, a whole-cell catalyst system based on the engineered haloalkaliphilic bacterium is potentiated to be applied in the sulfide treatment at a reduced cost.
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Janesch E, Pereira J, Neubauer P, Junne S. Phase Separation in Anaerobic Digestion: A Potential for Easier Process Combination? FRONTIERS IN CHEMICAL ENGINEERING 2021. [DOI: 10.3389/fceng.2021.711971] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The flexibilization of bioenergy production has the potential to counteract partly other fluctuating renewable energy sources (such as wind and solar power). As a weather-independent energy source, anaerobic digestion (AD) can offer on-demand energy supply through biogas production. Separation of the stages in anaerobic digestion represents a promising strategy for the flexibilization of the fermentative part of biogas production. Segregation in two reactor systems facilitates monitoring and control of the provision of educts to the second methanogenic stage, thus controlling biogas production. Two-stage operation has proven to reach similar or even higher methane yields and biogas purities than single-stage operation in many different fields of application. It furthermore allows methanation of green hydrogen and an easier combination of material and energy use of many biogenic raw and residual biomass sources. A lot of research has been conducted in recent years regarding the process phase separation in multi-stage AD operation, which includes more than two stages. Reliable monitoring tools, coupled with effluent recirculation, bioaugmentation and simulation have the potential to overcome the current drawbacks of a sophisticated and unstable operation. This review aims to summarize recent developments, new perspectives for coupling processes for energy and material use and a system integration of AD for power-to-gas applications. Thereby, cell physiological and engineering aspects as well as the basic economic feasibility are discussed. As conclusion, monitoring and control concepts as well as suitable separation technologies and finally the data basis for techno-economic and ecologic assessments have to be improved.
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