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  • 1.
    Mukesh Kumar, Awasthi
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Sarsaiya, Surendra
    Key Laboratory of Basic Pharmacology of Ministry of Education, Zunyi Medical University.
    Wainaina, Steven
    Rajendran, Karthik
    Department of Environmental Science, SRM University-AP.
    Kumar, Sumit
    College of Natural Resources and Environment, Northwest A&F University.
    Quan, Wang
    College of Natural Resources and Environment, Northwest A&F University.
    Awasthi, Sanjeev Kumar
    College of Natural Resources and Environment, Northwest A&F University.
    Chen, Hongyu
    College of Natural Resources and Environment, Northwest A&F University.
    Pandey, Ashok
    CSIR-Indian Institute of Toxicology Research, Vishvigyan Bhavan.
    Zhang, Zengqiang
    College of Natural Resources and Environment, Northwest A&F University.
    Jain, Archana
    Key Laboratory of Basic Pharmacology of Ministry of Education, Zunyi Medical University.
    A critical review of organic manure biorefinery models toward sustainable circular bioeconomy: Technological challenges, advancements, innovations, and future perspectives2019In: Renewable & sustainable energy reviews, ISSN 1364-0321, E-ISSN 1879-0690, p. 115-131Article in journal (Refereed)
    Abstract [en]

    Total livestock emissions account for up to 14.5% of man-made greenhouse gas emissions. Counteractive measures, such as circular economy concepts and negative emission technologies are necessary to limit global warming below 1.5 °C. Possible treatment options for organic manure include anaerobic digestion, combustion, gasification, hydrothermal liquefaction and composting. The choice of treatment varies depending on the economics, the requirement of a specific product, and sociocultural factors. Commercialization of these treatments needs a blend of appropriate technology, feasible economics, policy support and agreeable socio-cultural conditions. Key findings of this study include the following: 1. Increasing scientific awareness about manure management and treatment; 2. Building a sustainable cooperative model to commercialize technologies; 3. Creating a market for manure recycling products; 4. The role of policy in supporting technologies and consumers; and 5. The codigestion of substrates for better efficacy. Current trends show minimal actions in place as opposed to the high-rate of acceleration that is necessary.

  • 2. Wainaina, Steven
    et al.
    Lukitawesa, Lukitawesa
    University of Borås, Faculty of Textiles, Engineering and Business.
    Mukesh Kumar, Awasthi
    University of Borås, Faculty of Textiles, Engineering and Business.
    Taherzadeh, Mohammad J
    University of Borås, Faculty of Textiles, Engineering and Business.
    Bioengineering of anaerobic digestion for volatile fatty acids, hydrogen or methane production: A critical review2019In: Bioengineered, ISSN 2165-5979, E-ISSN 2165-5987, ISSN 2165-5979Article in journal (Refereed)
    Abstract [en]

    Anaerobic digestion (AD) is a well-established technology used for producing biogas or biomethane alongside the slurry used as biofertilizer. However, using a variety of wastes and residuals as substrate and mixed cultures in the bioreactor makes AD as one of the most complicated biochemical processes employing hydrolytic, acidogenic, hydrogen-producing, acetate-forming bacteria as well as acetoclastic and hydrogenoclastic methanogens. Hydrogen and volatile fatty acids (VFAs) including acetic, propionic, isobutyric, butyric, isovaleric, valeric and caproic acid and other carboxylic acids such as succinic and lactic acids are formed as intermediate products. As these acids are important precursors for various industries as mixed or purified chemicals, the AD process can be bioengineered to produce VFAs alongside hydrogen and therefore biogas plants can become biorefineries. The current critical review paper provides the theory and means to produce and accumulate VFAs and hydrogen, inhibit their conversion to methane and to extract them as the final products. The effects of pretreatment, pH, temperature, hydraulic retention time (HRT), organic loading rate (OLR), chemical methane inhibitions, and heat shocking of the inoculum on VFAs accumulation, hydrogen production, VFAs composition, and the microbial community were discussed. Furthermore, this paper highlights the possible techniques for recovery of VFAs from the fermentation media in order to minimize product inhibition as well as to supply the carboxylates for downstream procedures.

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  • 3. Wainaina, Steven
    et al.
    Mukesh Kumar, Awasthi
    University of Borås, Faculty of Textiles, Engineering and Business.
    Sarsaiya, Surendra
    Key Laboratory of Basic Pharmacology and Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi, Guizhou, PR China.
    Chen, Hongyu
    Institute of Biology, Freie Universität Berlin Altensteinstr. 6, 14195 Berlin, Germany.
    Singh, Ekta
    CSIR-National Environmental Engineering Research Institute, Nehru Marg, Nagpur 440 020, Maharashtra, India.
    Kumar, Aman
    CSIR-National Environmental Engineering Research Institute, Nehru Marg, Nagpur 440 020, Maharashtra, India.
    Ravindran, B.
    Department of Environmental Energy and Engineering, Kyonggi University Youngtong-Gu, Suwon, Gyeonggi-Do 16227, South Korea.
    Awasthi, Sanjeev Kumar
    College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China.
    Tao, Liu
    College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China.
    Duan, Yumin
    College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China.
    Kumar, Sunil
    CSIR-National Environmental Engineering Research Institute, Nehru Marg, Nagpur 440 020, Maharashtra, India.
    Zhang, Zengqiang
    College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China.
    Taherzadeh, Mohammad J
    University of Borås, Faculty of Textiles, Engineering and Business.
    Resource recovery and circular economy from organic solid waste using aerobic and anaerobic digestion technologies2020In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976Article in journal (Refereed)
    Abstract [en]

    With the inevitable rise in human population, resource recovery from waste stream is becoming important for a sustainable economy, conservation of the ecosystem as well as for reducing the dependence on the finite natural resources. In this regard, a bio-based circular economy considers organic wastes and residues as potential resources that can be utilized to supply chemicals, nutrients, and fuels needed by mankind. This review explored the role of aerobic and anaerobic digestion technologies for the advancement of a bio-based circular society. The developed routes within the anaerobic digestion domain, such as the production of biogas and other high-value chemicals (volatile fatty acids) were discussed. The potential to recover important nutrients, such as nitrogen through composting, was also addressed. An emphasis was made on the innovative models for improved economics and process performance, which include co-digestion of various organic solid wastes, recovery of multiple bio-products, and integrated bioprocesses.

  • 4.
    Wainaina, Steven
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Mukesh Kumar, Awasthi
    University of Borås, Faculty of Textiles, Engineering and Business.
    Sárvári Horváth, Ilona
    University of Borås, Faculty of Textiles, Engineering and Business.
    Taherzadeh, Mohammad J
    University of Borås, Faculty of Textiles, Engineering and Business.
    Anaerobic digestion of food waste to volatile fatty acids and hydrogen at high organic loading rates in immersed membrane bioreactors2020In: Renewable energy, ISSN 0960-1481, E-ISSN 1879-0682Article in journal (Refereed)
    Abstract [en]

    The organic loading rate (OLR) is an essential parameter that controls the anaerobic digestion process. This work investigated the performance of immersed membrane bioreactors operated at high OLRs of 4, 6, 8 and 10 g volatile solids (VS)/L/d regarding the fermentation behavior, product recovery and microbial dynamics during the acidogenic fermentation of food waste to volatile fatty acids (VFAs) and hydrogen. The highest yield of 0.52 g VFA/ gVSadded was attained at 6 g VS/L/d, while an optimal hydrogen yield of 14.7 NmL/ gVSadded was obtained at 8 g VS/L/d. The bacterial populations, analyzed using 16S rRNA gene amplicon sequencing, consisted mainly of Firmicutes and Actinobacteria at OLRs 4 and 8 g VS/L/d while Firmicutes, Actinobacteria and Proteobacteria phyla dominated at 6 and 10 g VS/L/d. Moreover, the presence of Clostridium and Lactobacillus genera correlated with the acetate, butyrate, caproate and lactate production.

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