Effect of neem leaf inclusion rates on compost physico-chemical, thermal and spectroscopic stability

Smith, Bryan A.M.; Eudoxie, Gaius; Stein, Robin S.; Ramnarine, Ravindra; Raghavan, Vijaya

doi:10.1016/j.wasman.2020.06.026

Cited by 23 publications

(6 citation statements)

References 69 publications

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“…Among Neem biomasses, leaves showed the highest value. This behavior may be due to differences in organic fractions of the materials; according to Smith et al [83], Neem leaves have a low carbohydrate content (O-alkyl carbon), a high alkyl-C value, and in FTIR analysis showed pronounced signals at 2920, 2852, 1640, and 1512 cm −1 , indicating asymmetric C-H stretches, symmetric C-H stretches, amide I-aromatic ring modes, and aromatic skeletal vibration of lignin, respectively. Comparing the HHV results of reported biomasses, sugarcane bagasse presented an average value of 19.156 MJ/kg.…”

Section: Discussionmentioning

confidence: 99%

Analysis of the Fuel Properties of the Seed Shell of the Neem Plant (Azadirachta indica)

Neto,

Melo Neta,

Sousa

et al. 2023

Processes

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The energetic potential of the seed shell of the Neem plant (Azadirachta indica) was investigated using proximate analysis, Higher Heating Value (HHV), thermal analysis (TG-DTG and DSC) in inert and oxidative atmospheres, and X-ray fluorescence (XRF). The results of ash (3.80% ± 0.44), volatile matter (81.76% ± 1.30), fixed carbon (14.44% ± 1.74), and estimated HHV (18.791 MJ/kg: average value) are compatible with other biomasses already used as fuels in the bioenergy industry. Thermograms showed three main degradation events in synthetic air and two in nitrogen, attributed to the moisture, release of volatile materials, and decomposition of hemicellulose, cellulose, and lignin. The elements positively detected by the XRF were Ca, K, S, P, Fe, Ti, Zn, Rb, and Sr.

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Section: Discussionmentioning

confidence: 99%

Analysis of the Fuel Properties of the Seed Shell of the Neem Plant (Azadirachta indica)

Neto,

Melo Neta,

Sousa

et al. 2023

Processes

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“…Different researchers [18][19][20][21][22][23][24] exposed three main phases in the thermal degradation of compost: (i) the first phase is between an initial and final temperature of 25 and 120 °C; (ii) the second phase is between 200 °C and 350 °C; (iii) the third phase is between 350 °C and 700 °C ( Figure 1). In the first phase, first peak at DTG (<200 °C), this water content reduction is due to a thermal dehydration process of the compost samples [25].…”

Section: Composting Evolution Research By Thermogravimetrymentioning

confidence: 99%

“…Moreover, Ouaqoudi et al [55] demonstrated that the combined use of TGA with TMAH-thermochemolysis and FTIR in the study and characterization of the chemical structure of humic fractions in composts provides consistent and complementary results. Lastly, Smith et al [24] employed TGA, FTIR and 13 C NMR to prove the degradation of both labile organic matter and complex aromatic and lignin compounds during composting.…”

Section: Composting Evolution Research Studies By Combining Differentmentioning

confidence: 99%

Thermogravimetry Applicability in Compost and Composting Research: A Review

et al. 2021

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Composting could be a suitable solution to the correct treatment and hygienization of several organic waste, producing compost that can be used in agriculture. The evolution and maturity of this process has been studied using a variety of techniques. One very promising technique for these studies is thermogravimetric analysis. On the other hand, the compost can be used for a variety of purposes different to the agricultural one, such as direct energy by combustion or energy and products by pyrolysis and its suitability can be measured by thermogravimetric techniques. With these goals, a bibliographic analysis has been done, applying Preferred Reporting Items for Systematic Reviews and Meta-Analyses PRISMA methodology, to the use of thermogravimetric equipment applied to the study of composting and compost uses. According to the methodology for PRISMA systematic reviews, the following databases have been searched Google Scholar, Web of Science, Mendeley, Microsoft Academic, World Wide Science, Science Direct, IEEE Xplore, Springer Link, Scopus, and PubMed by using the terms “thermogravimetry AND (compost OR composting) AND NOT plastic”.

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“…The substrate temperature is one of the key parameters of aerobic solid-phase fermentation [11,12]. Temperature changes are directly related to the effectiveness of transformation of organic substrates by microorganisms, which are the basis of the fermented mixture.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…Our analysis of [11][12][13][14][15][16] reveals that understanding and studying the phenomena of energy generation and transmission during composting is an important parameter in monitoring, managing, and optimizing composting processes.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determining the thermal mode of bio-based raw materials composting process in a rotary-type chamber

Golub

Chuba²,

Грабар³

et al. 2021

EEJET

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One of the promising methods to dispose of agricultural bio-based raw materials is to produce compost by aerobic fermentation in rotary chambers. High efficiency of the composting process is achieved when a proper temperature mode is maintained at each phase of the process. Changes in temperature are directly related to the effective transformation of organic substrates by microorganisms and are the reason for the low quality of produced compost in terms of its agrochemical and microbiological parameters. It was established that a high-temperature regime is achieved on the condition that the amount of heat released during the biodegradation of raw materials by microorganisms is greater than the heat loss associated with the substrate aeration and surface cooling. Therefore, the time during which the fermented mass remains warm depends entirely on the substrate's physical-chemical characteristics, the parameters of the equipment, and the modes of its operation. To describe the established conditions, based on the equation of thermal balance, a mathematical model has been built. The model relates the thermal costs necessary to maintain the optimal temperature regime of the process to the substrate's moisture content and specific active heat generation, as well as to such an important thermal physical parameter of the chamber as the coefficient of heat transfer of the wall material. A rotary chamber was manufactured to investigate the thermal mode of the bio-based raw materials composting process. It has been experimentally established that the chamber walls' heat transfer coefficient of 1.6 W/(m2·°C), a value of the substrate's specific active heat generation of 9.2 W/kg, and a moisture content of 58 % provide for the thermal needs for the process with the release of 140 MJ of excess heat. The reported study could be the basis for the modernized methodology of thermal calculations of the bio-based raw materials composting process in closed fermentation chambers

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Effect of neem leaf inclusion rates on compost physico-chemical, thermal and spectroscopic stability

Cited by 23 publications

References 69 publications

Analysis of the Fuel Properties of the Seed Shell of the Neem Plant (Azadirachta indica)

Analysis of the Fuel Properties of the Seed Shell of the Neem Plant (Azadirachta indica)

Thermogravimetry Applicability in Compost and Composting Research: A Review

Determining the thermal mode of bio-based raw materials composting process in a rotary-type chamber

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