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    Thermogravimetric and Kinetic Analysis of Melon (Citrullus colocynthis L.) Seed Husk Using the Distributed Activation Energy Model

    Nyakuma Bemgba Bevan
    Environmental and Climate Technologies, 01 December 2015, Vol.15(1), pp.77-89 [Peer Reviewed Journal]
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    Title: Thermogravimetric and Kinetic Analysis of Melon (Citrullus colocynthis L.) Seed Husk Using the Distributed Activation Energy Model
    Author: Nyakuma Bemgba Bevan
    Subject: Activation Energy ; Husks ; Kinetics ; Melon ; Thermogravimetric ; Engineering ; Environmental Sciences
    Description: This study seeks to characterize the thermochemical fuel properties of melon seed husk (MSH) as a potential biomass feedstock for clean energy and power generation. It examined the ultimate analysis, proximate analysis, FTIR spectroscopy and thermal decomposition of MSH. Thermogravimetric (TG) analysis was examined at 5, 10, 20 °C/min from 30-800 °C under nitrogen atmosphere. Subsequently, the Distributed Activation Energy Model (DA) was applied to determine the activation energy, E, and frequency factor, A. The results revealed that thermal decomposition of MSH occurs in three (3) stages; drying (30-150 °C), devolatization (150-400 °C) and char degradation (400-800 °C). Kinetic analysis revealed that the E values fluctuated from 145.44-300 kJ/mol (Average E = 193 kJ/mol) while A ranged from 2.64 × 1010 to 9.18 × 1020 min-1 (Average E = 9.18 × 1019 min-1) highlighting the complexity of MSH pyrolysis. The fuel characterization and kinetics of MSH showed it is an environmentally...
    Is part of: Environmental and Climate Technologies, 01 December 2015, Vol.15(1), pp.77-89
    Identifier: 2255-8837 (E-ISSN); 10.1515/rtuect-2015-0007 (DOI)

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    Physicochemical characterization of low rank Nigerian coals

    Nyakuma, Bemgba Bevan
    Cornell University
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    Title: Physicochemical characterization of low rank Nigerian coals
    Author: Nyakuma, Bemgba Bevan
    Subject: Condensed Matter - Materials Science
    Description: This study is aimed at investigating the physicochemical properties of low rank Nigerian coals. The coal samples were examined using bomb calorimetry, ultimate and proximate analyses to determine the heating value, elemental composition and physicochemical properties. The calorific values of the coals were; 23.74 MJ/kg for GMG; 27.34 MJ/kg for SKJ and 30.52 MJ/kg for AFZ. The results of elemental analysis showed high C, H, O and low N, and S content for the coals. The GMG coal displayed the lowest N, and S values emphasizing its low pollutant emission potential. The highest VM (51.16 %) and M (5.28 %) content was observed for GMG; AFZ coal displayed the highest ash content at 30.99 %; and SKJ the highest FC content. Consequently, the reactivity and maturity of the low rank Nigerian coals investigated increases in the order; GMG > SKJ > AFZ. Keywords: Physicochemical, Characterization, Low rank, Nigeria, Coal, Energy Comment: 7 pages, 1 Figure, 2 Tables, 25 references
    Identifier: 1506.02068 (ARXIV ID)

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    Pyrolysis kinetics of Melon (Citrullus colocynthis L.) seed husk

    Nyakuma, Bemgba Bevan
    Cornell University
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    Title: Pyrolysis kinetics of Melon (Citrullus colocynthis L.) seed husk
    Author: Nyakuma, Bemgba Bevan
    Subject: Physics - Physics And Society
    Description: This study is aimed at investigating the thermochemical fuel characteristics and kinetic decomposition of melon seed husks (MSH) under inert (pyrolysis) conditions. The calorific value, elemental composition, proximate analyses and thermal kinetics of MSH was examined. The kinetic parameters; activation energy E and frequency factor A for MSH decomposition under pyrolysis conditions were determined using the Kissinger and isoconversional Flynn-Wall-Ozawa (FWO) methods. The values of E for MSH ranged from 146.81 to 296 kJ/mol at degrees of conversion {\alpha} = 0.15 to 0.60 for FWO. The decomposition of MSH process was fastest at {\alpha} = 0.15 and slowest at {\alpha} = 0.60 with average E and A values of 192.96 kJ/mol and 2.86 x 1026 min-1, respectively at correlation values of 0.9847. The kinetic values of MSH using the Kissinger method are E = 161.26 kJ/mol and frequency factor, A = 2.08 x 1010 min-1 with the correlation value, R2 = 0.9958. The results indicate that MSH possesses important characteristics of a potential solid biofuel (SBF) for future thermochemical applications in clean energy and power generation. Comment: 7 pages, 2 Figures, 2 Tables, 17 references
    Identifier: 1506.05419 (ARXIV ID)

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    Chemical and Pyrolytic Thermogravimetric Characterization of Nigerian Bituminous Coals

    Nyakuma Bemgba Bevan, Jauro Aliyu
    GeoScience Engineering, 01 December 2016, Vol.62(3), pp.1-5 [Peer Reviewed Journal]

    • Several versions

    Physicochemical Characterization and Thermal Decomposition of Garin Maiganga Coal

    Nyakuma Bemgba Bevan, Jauro Aliyu
    GeoScience Engineering, 01 December 2016, Vol.62(3), pp.6-11 [Peer Reviewed Journal]

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    Thermogravimetric Analysis of Char Waste from the Air Gasification of Empty Fruit Bunch Briquette

    Nyakuma Bemgba Bevan, Mazangi Mojtaba, Johari Anwar, Ahmad Arshad, Tuan Abdullah Tuan Amran
    MATEC web of conferences, 01 July 2014, Vol.13, p.02004 [Peer Reviewed Journal]
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    Title: Thermogravimetric Analysis of Char Waste from the Air Gasification of Empty Fruit Bunch Briquette
    Author: Nyakuma Bemgba Bevan; Mazangi Mojtaba; Johari Anwar; Ahmad Arshad; Tuan Abdullah Tuan Amran
    Subject: Engineering
    Description: The thermal decomposition behavior of char waste produced from the air gasification of Empty Fruit Bunch (EFB) briquette was examined using thermogravimetric analysis (TGA). A comparison between the thermal decomposition behavior of char waste and EFB briquette is also presented. The results indicate that the char waste produced decreased from 22 % to 18 % with increasing temperature from 600 °C to 700 °C during gasification. This is due to the effect of high temperatures on the primary char decomposition reactions. It was observed that char degradation occurs in two steps; char degradation I & II with weight losses of 17 % and 32 % respectively. This showed that only ~ 50 % char was decomposed during thermal analysis, hence higher temperatures are required to ensure complete decomposition. The TGA curve for EFB briquette showed that complete thermal decomposition of EFB briquette occurs in four stages namely; drying, devolatization, reduction and char degradation. The most...
    Is part of: MATEC web of conferences, 01 July 2014, Vol.13, p.02004
    Identifier: 2261-236X (E-ISSN); 10.1051/matecconf/20141302004 (DOI)

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    Current status, challenges, and prospects of biopesticide utilization in Nigeria

    Ivase Tertsegha John-Paul, Nyakuma Bemgba Bevan, Ogenyi Blessing Uwere, Balogun Adinoyi David, Hassan Muhammed Nuraddeen
    Acta Universitatis Sapientiae. Agriculture and environment, 01 December 2017, Vol.9(1), pp.95-106 [Peer Reviewed Journal]
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    Title: Current status, challenges, and prospects of biopesticide utilization in Nigeria
    Author: Ivase Tertsegha John-Paul; Nyakuma Bemgba Bevan; Ogenyi Blessing Uwere; Balogun Adinoyi David; Hassan Muhammed Nuraddeen
    Subject: Pesticides ; Food Security ; Pest Control ; Crop Disease ; Nigeria ; Agriculture
    Description: The toxicity, persistence, and non-biodegradability of chemical pesticides have increased calls for the adoption of sustainable and cost-effective pest control measures. Biopesticides present a sustainable alternative to synthetic pesticides. However, the biopesticide utilization in agrarian countries like Nigeria remains low, resulting in increased chemical pesticide utilization. Therefore, this paper seeks to examine the current status, challenges, and prospects of biopesticides in Nigeria. The findings revealed that biopesticide utilization in Nigeria is low due to high costs, poor infrastructure, skilled manpower alongside inconsistent field performance and government policies. The solution to these challenges will significantly boost crop protection, food security, and sustainable agriculture in Nigeria.
    Is part of: Acta Universitatis Sapientiae. Agriculture and environment, 01 December 2017, Vol.9(1), pp.95-106
    Identifier: 2068-2964 (E-ISSN); 10.1515/ausae-2017-0009 (DOI)

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    Torrefaction of Pelletized Oil Palm Empty Fruit Bunches

    Nyakuma, Bemgba Bevan, Ahmad, Arshad, Johari, Anwar, Abdullah, Tuan Amran Tuan, Oladokun, Olagoke
    Cornell University
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    Title: Torrefaction of Pelletized Oil Palm Empty Fruit Bunches
    Author: Nyakuma, Bemgba Bevan; Ahmad, Arshad; Johari, Anwar; Abdullah, Tuan Amran Tuan; Oladokun, Olagoke
    Subject: Physics - Physics And Society
    Description: The torrefaction of oil palm Empty Fruit Bunch (EFB) briquettes was examined in this study. The results indicate that temperature significantly influenced the mass yield, energy yield and heating value of oil palm empty fruit bunch (OPEFB) briquettes during torrefaction. The solid uniform compact nature of EFB briquettes ensured a slow rate of pyrolysis or devolatization which enhanced torrefaction. The mass yield decreased from 79.70 % to 43.03 %, energy yield from 89.44 % to 64.27 % during torrefaction from 250 {\deg}C to 300 {\deg}C. The heating value (HHV) of OPEFB briquettes improved significantly from 17.57 MJ/kg to 26.24 MJ/kg after torrefaction at 300 {\deg}C for 1 hour. Fundamentally, the study has highlighted the effects of pelletization and torrefaction on solid fuel properties of oil palm EFB briquettes and its potential as a solid fuel for future thermal applications. Comment: 5 pages, 2 Figures
    Identifier: 1505.05469 (ARXIV ID)

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    Emerging trends in municipal solid waste incineration ashes research: a bibliometric analysis from 1994 to 2018

    Wong, Syieluing, Mah, Angel Xin Yee, Nordin, Abu Hassan, Nyakuma, Bemgba Bevan, Ngadi, Norzita, Mat, Ramli, Amin, Nor Aishah Saidina, Ho, Wai Shin, Lee, Ting Hun
    Environmental science and pollution research international, March 2020, Vol.27(8), pp.7757-7784 [Peer Reviewed Journal]
    MEDLINE/PubMed (U.S. National Library of Medicine)
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    Title: Emerging trends in municipal solid waste incineration ashes research: a bibliometric analysis from 1994 to 2018
    Author: Wong, Syieluing; Mah, Angel Xin Yee; Nordin, Abu Hassan; Nyakuma, Bemgba Bevan; Ngadi, Norzita; Mat, Ramli; Amin, Nor Aishah Saidina; Ho, Wai Shin; Lee, Ting Hun
    Subject: Circular Economy ; Closed-Loop Recycling ; Microwave-Assisted Hydrothermal Treatment ; Polychlorinated Dibenzo-P-Dioxins ; Polychlorinated Dibenzofurans ; Resource Sustainability ; Refuse Disposal ; Solid Waste ; Coal Ash -- Chemistry
    Description: The rapidly increasing generation of municipal solid waste (MSW) threatens the environmental integrity and well-being of humans at a global level. Incineration is regarded as a technically sound technology for the management of MSW. However, the effective management of the municipal solid waste incineration (MSWI) ashes remains a challenge. This article presents the global dynamics of MSWI ashes research from 1994 to 2018 based on a bibliometric analysis of 1810 publications (research articles and conference proceedings) extracted from the Web of Science database, followed by a comprehensive summary on the research developments in the field. The results indicate the rapid growth of annual publications on MSWI ashes research, with China observed as the most productive country within the study period. Waste Management, Journal of Hazardous Materials, Chemosphere and Waste Management & Research, which accounted for 35.42% of documents on MSWI research, are the most prominent journals in the...
    Is part of: Environmental science and pollution research international, March 2020, Vol.27(8), pp.7757-7784
    Identifier: 1614-7499 (E-ISSN); 32020458 Version (PMID); 10.1007/s11356-020-07933-y (DOI)