Organic Waste Conversion Via Continuous Anaerobic Co-Digestion of Oil Palm Empty Fruit Bunches and Cow Manure: Evaluation of Feeding Regime on Methane Production

Darwin, Darwin; Pratama, Atmadian; Mardhotillah,

doi:10.2478/ata-2021-0002

Cited by 7 publications

(8 citation statements)

References 31 publications

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“…This could be seen on the culture pH during the decomposition process in which the pH was stable at the level of 7.06. This indicated that the culture pH was still in the range of an ideal pH for running anaerobic digestion and/or anaerobic composting process [23,28]. The current study was in agreement with the study by Zorpas et al [29] revealing that the optimum pH values for the bacterial development on the processing of anaerobic compost production are from 6 to 7.5.…”

Section: Resultssupporting

confidence: 91%

Anaerobic Co-Digestion of Cow Manure and Palm Oil Mill Effluent (POME): Assessment of Methane Production and Biodegradation Efficiency

Darwin¹,

Diana²,

Mardhotillah³

et al. 2021

IJDNE

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The performance of anaerobic co-digestion of cow manure and POME was evaluated. The anaerobic composting process was carried out by using semi-continuous reactors under the mesophilic condition (35 ± 1℃). The addition of POME to the on-going anaerobic composting of cow manure was applied stepwise within a cycle of HRT (20 days). Results showed that the anaerobic co-digestion reactor could produce methane at about six times higher (7.2 L CH4) than the control reactor (1.3 L CH4). An increasing of POME loaded to the on-going anaerobic composting cow manure culture (4% to 64%) did not affect pH of the culture in which pH was still stable between 7.11 and 7.5. Assessment of biodegradation efficiency revealed that nitrogen removal of the anaerobic co-digestion reactor was six times higher (21%) than the nitrogen removal of the control reactor (3.4%). This suggested that the anaerobic co-digestion reactor performed sufficiently well in which no organic acid as well as ammonia accumulated in the reactor that could be effective to decompose the organic matters.

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Section: Resultssupporting

confidence: 91%

Anaerobic Co-Digestion of Cow Manure and Palm Oil Mill Effluent (POME): Assessment of Methane Production and Biodegradation Efficiency

Darwin¹,

Diana²,

Mardhotillah³

et al. 2021

IJDNE

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“…The water content was measured by a laboratory heating and drying oven, in which the sample was heated for approx. 24 h at 105 °C (Rice et al 2017;Darwin et al 2019b;Darwin et al 2021b). The flash, fire cloud and pour points were measured using a laboratory hot plate equipped with a digital thermocouple.…”

Section: Resultsmentioning

confidence: 99%

Enhanced biodiesel production from waste cooking oils catalyzed by sodium hydroxide supported on heterogeneous co-catalyst of bentonite clay

Darwin,

Harahap,

Pratama

et al. 2023

Res. Agric. Eng.

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Various proportions of bentonite clay performing as co-catalysts were evaluated for the production of biodiesel from waste cooking oil (WCO). The results showed that the use of bentonite as a heterogeneous co-catalyst could significantly increase the biodiesel yield by approximately 50% of the control. The heterogeneous co-catalyst of bentonite clay improved the properties of the produced biodiesel including acid number, free fatty acids (FFA), relative density, kinematic viscosity and flash point fulfilling with the standard ASTM limits and the European Biodiesel Standard (EN 14214). The use of bentonite clay in the transesterification of WCO could also enhance the conductivity of the produced biodiesel from 11 to 100 µS•m -1 .

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“…During the processes of selective enrichment and fermentation, pH of the culture was regularly recorded utilizing a Lab Benchtop pH meter multifunction with complete probe. The pH meter was calibrated and validated with buffer solution prior to the measurements [32,33].…”

Section: Methodsmentioning

confidence: 99%

Carbohydrate Enrichment in In-Vitro Civet Coffee Fermentation: Impact on Arabica Coffee Beans

Darwin,

Bulan,

Hapirayani

et al. 2023

IJDNE

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This study aimed to evaluate the performance of in-vitro fermentation processes on civet coffee, employing a mixed-microbial enrichment culture, and to assess its impact on the physicochemical properties of the fermented product. Arabica Coffee cherries were utilized as the subject in this investigation. The inoculum, derived from civet fecal suspensions, was enriched through the augmentation of various carbohydrates, including soluble (e.g., glucose) and insoluble (e.g., starch) carbohydrates, mirroring the primary components present in civet food. Over an incubation period of four hours, a drop in pH from 7.0 to 5.6 was observed in the cultures, and volatile fatty acid (VFA) was detected at 2.8 mmol/L. It was found that the sugar conversion rate during in-vitro coffee fermentation by the starch-consuming microbial culture (2.1 mM/hour) significantly outperformed that of the glucose-consuming culture (0.9 mM/hour). The caffeine content in in-vitro fermented coffee (0.27-0.28 mg/100g) was found to closely approximate that of in-vivo fermented coffee via civet digestion (0.254 mg/100g). Notably, both in-vitro and in-vivo fermentation yielded caffeine content substantially lower than that of conventionally fermented coffee, which ranged between 1.5 and 2.7 g/100 g. In summary, the fermentation of Arabica coffee cherries using a mixed microbial culture, enriched with starch supplementation (SCM), demonstrated a faster rate compared to a culture enriched with glucose (GCM). The findings provide important insights for optimizing invitro civet coffee fermentation processes.

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Organic Waste Conversion Via Continuous Anaerobic Co-Digestion of Oil Palm Empty Fruit Bunches and Cow Manure: Evaluation of Feeding Regime on Methane Production

Cited by 7 publications

References 31 publications

Anaerobic Co-Digestion of Cow Manure and Palm Oil Mill Effluent (POME): Assessment of Methane Production and Biodegradation Efficiency

Anaerobic Co-Digestion of Cow Manure and Palm Oil Mill Effluent (POME): Assessment of Methane Production and Biodegradation Efficiency

Enhanced biodiesel production from waste cooking oils catalyzed by sodium hydroxide supported on heterogeneous co-catalyst of bentonite clay

Carbohydrate Enrichment in In-Vitro Civet Coffee Fermentation: Impact on Arabica Coffee Beans

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