Pretreatment conditions of palm oil mill effluent (POME) for thermophilic biohydrogen production by mixed culture

Mahmod, Safa Senan; Jahim, Jamaliah Md; Abdul, Peer Mohamed

doi:10.1016/j.ijhydene.2017.07.178

Cited by 61 publications

(19 citation statements)

References 44 publications

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“…For process intensification, the approaches such as pure culture, continuous operation, consolidated saccharification and fermentation, chemical additions, are optimization avenues. In this work, for convenience of discussions, the comparisons were divided into the following five categories, namely pure culture (PC) [73,[84][85][86][87][88][89][90][91][92][93][94], chemical additions (CA) [2,39,76,[95][96][97], continuous operation with mixed culture (COMC) [98][99][100][101][102], batch operation with mixed culture (BOMC) [103][104][105][106][107][108] and consolidated saccharification and fermentation (CSF) [18,31,61,[109][110][111], respectively. For quantitative comparison of hydrogen yield across different literatures, the necessary Carbon-molar-based mass balance for DF is pivotal and necessary.…”

Section: Results Comparison Among Different Process Intensificationsmentioning

confidence: 99%

A Review of Biohydrogen Productions from Lignocellulosic Precursor via Dark Fermentation: Perspective on Hydrolysate Composition and Electron-Equivalent Balance

et al. 2020

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This paper reviews the current technological development of bio-hydrogen (BioH2) generation, focusing on using lignocellulosic feedstock via dark fermentation (DF). Using the collected reference reports as the training data set, supervised machine learning via the constructed artificial neuron networks (ANNs) imbedded with feed backward propagation and one cross-out validation approach was deployed to establish correlations between the carbon sources (glucose and xylose) together with the inhibitors (acetate and other inhibitors, such as furfural and aromatic compounds), hydrogen yield (HY), and hydrogen evolution rate (HER) from reported works. Through the statistical analysis, the concentrations variations of glucose (F-value = 0.0027) and acetate (F-value = 0.0028) were found to be statistically significant among the investigated parameters to HY and HER. Manipulating the ratio of glucose to acetate at an optimal range (approximate in 14:1) will effectively improve the BioH2 generation (HY and HER) regardless of microbial strains inoculated. Comparative studies were also carried out on the evolutions of electron equivalent balances using lignocellulosic biomass as substrates for BioH2 production across different reported works. The larger electron sinks in the acetate is found to be appreciably related to the higher HY and HER. To maintain a relative higher level of the BioH2 production, the biosynthesis needs to be kept over 30% in batch cultivation, while the biosynthesis can be kept at a low level (2%) in the continuous operation among the investigated reports. Among available solutions for the enhancement of BioH2 production, the selection of microbial strains with higher capacity in hydrogen productions is still one of the most phenomenal approaches in enhancing BioH2 production. Other process intensifications using continuous operation compounded with synergistic chemical additions could deliver additional enhancement for BioH2 productions during dark fermentation.

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Section: Results Comparison Among Different Process Intensificationsmentioning

confidence: 99%

A Review of Biohydrogen Productions from Lignocellulosic Precursor via Dark Fermentation: Perspective on Hydrolysate Composition and Electron-Equivalent Balance

et al. 2020

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“…Hydrogenic POME effluent was obtained from the BioH 2 fermentation reactor fed with pre-treated POME (dilute nitric acid pre-treatment) 71 . The hydrogenic POME effluent was of brown-yellowish colour with a strong sour smell at the pH between 4.8 and 5.2, temperature of 55 °C, total COD of 63.27 ± 5.2 g/L, VFA of 3.25 ± 0.75 g CaCO 3 /L, TSS of 17.5 ± 2.0 g/L and VSS of 8.85 ± 1.5 g/L.…”

Section: Methodsmentioning

confidence: 99%

“…*The total sugar consumed as glucose equivalent. **Pre-treated POME with dilute nitric acid71 . ***Biohydrogen production in the first-stage anaerobic fermentation28 .…”

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confidence: 99%

Potential Utilisation of Dark-Fermented Palm Oil Mill Effluent in Continuous Production of Biomethane by Self-Granulated Mixed Culture

Mahmod

Azahar

Luthfi

et al. 2020

Sci Rep

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Two-stage anaerobic digestion of palm oil mill effluent (POME) is a promising method for converting the waste from the largest agricultural industry in Southeast Asia into a clean and sustainable energy. This study investigates the degradation of acid-rich effluent from the dark fermentation stage for the production of biomethane (BioCH4) in a 30-L continuous stirred-tank reactor (CSTR). The continuous methanogenic process was operated with varied HRTs (10 - 1 day) and OLRs (4.6–40.6 gCOD/L.d−1) under thermophilic conditions. Methanothermobacter sp. was the dominant thermophilic archaea that was responsible for the production rate of 4.3 LCH4/LPOME.d−1 and methane yield of 256.77 LCH4kgCOD at HRT of 2 d, which is the lowest HRT reported in the literature. The process was able to digest 85% and 64% of the initial POME’s COD and TSS, respectively. The formation of methane producing granules (MPG) played a pivotal role in sustaining the efficient and productive anaerobic system. We report herein that the anaerobic digestion was not only beneficial in reducing the contaminants in the liquid effluent, but generating BioCH4 gas with a positive net energy gain of 7.6 kJ/gCOD.

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“…Numerous technologies have been investigated in the last decade to reduce the environmental risks from the palm oil biodiesel industry, as addressed by Abdul-Hamid et al [20]. Traditional ponding system has been the preferred technique to treat palm oil mill effluent [21], but this method has some limitations, such as higher greenhouse gas (GHG) emissions. One of the solutions is proposed by Jamaludin et al [22] to use recycling water to reduce GHG emissions.…”

Section: Challenges With Indonesian and Malaysian Palm Oil-biodiesel Industrymentioning

confidence: 99%

Effect of COVID-19 on Biodiesel Industry: A Case Study in Indonesia and Malaysia

Veza

Muhammad

Oktavian

et al. 2021

IJAME

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Indonesia and Malaysia are currently holding prominent roles in the global palm oil market. Both countries are the top two palm oil producers in the world and have ambitious targets to increase the palm oil-based biodiesel mandate. In Indonesia, the current programme of blending 20 per cent palm oil into 80 per cent diesel (B20) increases to B30 in 2020. Likewise, Malaysia plans to increase its biodiesel mandate from B10 to B20 in 2020. However, the outbreak of COVID-19 has infected millions and brought the global economy to a near-deadlock. The effect is particularly severe in the fuel industry owing to movement restrictions and the historic drop in oil prices. Evaluating the impact of the COVID-19 on the biodiesel industry is crucial for policymakers but challenging as the pandemic has evolved with intense speed. This article aims to discuss the impact of COVID-19 on the Indonesian and Malaysian biodiesel industry. In addition to that, a number of possible solutions to overcome the challenges were addressed and proposed. Despite severely affected by COVID-19, both Indonesia and Malaysia can use this momentum to improve and strengthen their biodiesel sector. Given its fiscal deficit, Indonesia should postpone its biodiesel blending mandate as the subsidy to support the programme can worsen the country’s financial stability. In Malaysia, where labour shortage is prevalent, modernising plantations with automated equipment, for instance, could potentially remove the dirty and dangerous stereotypes associated with plantation works, thus attracting more locals to work in the palm oil plantation and solving the labour shortage. This paper also briefly addresses the adoption of Industry 4.0 and Circular Economy for the palm oil biodiesel industry.

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Pretreatment conditions of palm oil mill effluent (POME) for thermophilic biohydrogen production by mixed culture

Cited by 61 publications

References 44 publications

A Review of Biohydrogen Productions from Lignocellulosic Precursor via Dark Fermentation: Perspective on Hydrolysate Composition and Electron-Equivalent Balance

A Review of Biohydrogen Productions from Lignocellulosic Precursor via Dark Fermentation: Perspective on Hydrolysate Composition and Electron-Equivalent Balance

Potential Utilisation of Dark-Fermented Palm Oil Mill Effluent in Continuous Production of Biomethane by Self-Granulated Mixed Culture

Effect of COVID-19 on Biodiesel Industry: A Case Study in Indonesia and Malaysia

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