Thermochemical digestate fertilizer from solid waste: Characterization, labile carbon dynamics, dehydrogenase activity, water holding capacity and biomass allocation in banana

Leno, Naveen; Sudharmaidevi, Cheruvelil Rajamma; Byju, G.; Thampatti, K.C. Manorama; Krishnaprasad, Priya Usha; Jacob, Geethu; Gopinath, Pratheesh P.

doi:10.1016/j.wasman.2021.01.002

Cited by 23 publications

(10 citation statements)

References 68 publications

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“…The pH and EC values of the end product were in conformity with the recommended value for organic fertiliser (FAI, 2019). Organic fertiliser having higher bulk density restricts aeration and root respiration in plants (Leno et al, 2021). The bulk density was also found within the acceptable limits, lower bulk density in the end product might be because of the increase in porosity and decrease in moisture content during the treatment (Kumar and Gupta, 2021).…”

Section: Characteristics Of the End Productmentioning

confidence: 99%

Optimisation of process parameters of a thermal digester for the rapid conversion of food waste into value-added soil conditioner

Kumar

Gupta

Yadav³

2023

Waste Manag Res

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A novel thermal digester for converting food waste (FW) into nutrient-rich soil conditioner was designed and explored. The process variables, that is, temperature, the volume of the digestion chamber and the rotational speed of the digester were optimised using response surface methodology (RSM). The study revealed that the digester temperature of 150°C and rotational speed of 40 RPM required minimum time (180 minutes) for attaining the equilibrium moisture with a minimum energy consumption of 0.218 kWh kg−1. The process resulted in 80 ± 2.5% reduction in total volume of the FW. Detailed characterisation revealed that the end product was comparable to the organic fertiliser as per the Fertiliser Association of India norms. The digestion helps in breakdown of cellulose content of FW into hemicellulose which supports formation of primary and secondary walls, seed storage carbohydrates, and facilitates plant growth. 1H-Nuclear magnetic resonance (1H-NMR) spectra of the end product revealed mineralisation of organics during digestion. Decrease in ultraviolet (UV) absorbance value at 280 nm also revealed the humification of the end product. X-ray diffraction (XRD) analysis disclosed extremely low crystallinity and non-recalcitrant nature of the end product. A low humification index value (HI-3.43), high fertilising index (FI-4.8), and clean index (CI-5.0) revealed that the end product could safely be utilised as an organic fertiliser. The cost–benefit analysis revealed that thermal digestion technique is profitable and economically viable with benefit–cost ratio (BCR) of 1.35. The study offers a unique approach for the rapid and hassle-free production of value-added soil conditioner from FW.

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Section: Characteristics Of the End Productmentioning

confidence: 99%

Optimisation of process parameters of a thermal digester for the rapid conversion of food waste into value-added soil conditioner

Kumar

Gupta

Yadav³

2023

Waste Manag Res

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“…On average, 88.88% of the water used to dilute the dung was recovered for the second generation biogas production. And the solid product is a good organic fertilizer [21,22]. It contains phosphorus (P 2 O 5 ) and potassium (K 2 O) [23][24]25].…”

Section: Filtration Of Digestatementioning

confidence: 99%

Effect of Recycling Digestate Filtrate for Cow Dung Dilution on Biogas Production

Abakaka

Joël²

2022

Preprint

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Biogas production in the Sahelian zone faces the problem of water shortage during the dry season. This study was initiated in the bioscience laboratory at the University of Maroua with the objective of improving the accessibility of households to biogas in water scarcity conditions. Also another aim is to recycle the filtrate of the digestate into a new dilution of the substrate for biogas production. Thus, the Cow Dung (CD) digestate from the biogas unit was filtered. Two types of filters were made: filter with sand and cotton and filter with sand, biochar and cotton. The filtrate obtained was used to make five treatments with CD to feed mini biodigesters (1st generation) of 1 liter each. After a HRT of 30 days, the digestate from the 1st generation was again filtered into the same treatments (2nd generation). During the anaerobic digestion; the production and pH of each treatment repeated three times were evaluated. The effect of water recycling and the type of filtration were analyzed. This study shows that the dilution of CD with the filtrate from the 1st generation significantly improves on the production of biogas by 47% compared to that of dung diluted with ordinary water. In the 2nd generation, dilution with ordinary water provided the best production which is 7% higher than that obtained from the filtrates without biochar. As the pH is concerned, it varies between 6 and 7.5 when filtrates are used. It was more acidic when water has been used.

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Section: Figure 2 Digestate Filtrate To Be Recycled For Biogas Produc...mentioning

confidence: 99%

Effect of recycling digestate filtrate for cow dung dilution on biogas production

Joël¹,

Abakaka²,

Tchombi³

et al. 2022

Int. J. Sci. Res. Arch.

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Biogas production in the Sahelian zone faces the problem of water shortage. This is one of the biggest obstacles encountered by projects to substitute firewood by biogas in this areas. The study aims to improve the accessibility of households to biogas in water shortage conditions by recycling the filtrate of the digestate into a new dilution of the substrate for biogas production. Thus, the Cow Dung (CD) digestate from the biogas unit was filtered. Filter with sand and cotton and filter with sand, biochar, and cotton were made. The filtrate obtained was used to make five treatments with CD to feed mini biodigesters (1st generation) of 1 liter each. After a HRT of 30 days, the digestate from the 1st generation was again filtered and reused to dilute five treatment (2nd generation). The biogas production and pH of each treatment repeated three times were evaluated. The results show that the dilution of CD with the filtrate from the 1st generation significantly improves the production of biogas by 47% compared to that of dung diluted with ordinary water. In the 2nd generation, dilution with OW provided the highest production which is 7% more than that obtained from the filtrates without biochar. As the pH is concerned, it varies between 6 and 7.5 when filtrates are used. It was more acidic when OW has been used. It appears that, the same quantity of water can be used three times for substrate dilution. This leads to less water demand for biogas unit running

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Thermochemical digestate fertilizer from solid waste: Characterization, labile carbon dynamics, dehydrogenase activity, water holding capacity and biomass allocation in banana

Cited by 23 publications

References 68 publications

Optimisation of process parameters of a thermal digester for the rapid conversion of food waste into value-added soil conditioner

Optimisation of process parameters of a thermal digester for the rapid conversion of food waste into value-added soil conditioner

Effect of Recycling Digestate Filtrate for Cow Dung Dilution on Biogas Production

Effect of recycling digestate filtrate for cow dung dilution on biogas production

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