Biodiesel value chain and access to energy in Ethiopia: Policies and business prospects

Negash, Martha; Riera, Olivia

doi:10.1016/j.rser.2014.07.152

Cited by 20 publications

(13 citation statements)

References 45 publications

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“…However, three-fourths of the world's poor households consumed only 10% of the worldwide energy supply [3]. Most of these poor households are living in net oilimporting Sub-Sahara Africa, where Ethiopia is ranked at the bottom of the energy poverty index [4]. In Ethiopia, 91% of the energy demand is satisfied by the local available traditional biomass resources [5].…”

Section: Introductionmentioning

confidence: 99%

“…Although the seeds are suitable for biodiesel production, 65-70% of them reported being disposed of as Jatropha press cake (JPC) during oil extraction [12], while 100 kg of biodiesel production generates 10-14 kg of crude glycerol (CG) [13]. Considering the availability of adequate Jatropha plantation in Ethiopia [4] and higher seed production per ha [14], biodiesel production would generate a substantial quantity of JPC (10.5-11.4 million tons) and CG (0.61-0.70 million tons) per year.…”

Section: Introductionmentioning

confidence: 99%

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Alkaline and co-digestion pretreatments: process optimization for enhancing the methane yield of Jatropha press cake

Ewunie

Morken

Yigezu

2020

Biomass Conv. Bioref.

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Oil extraction and biodiesel production process produce a massive amount of by-products like Jatropha press cake (JPC) and crude glycerol (CG), which could be used as a potential substrate for methane production. However, the higher lignocellulosic and nitrogen content in the JPC act as a recalcitrant and inhibitor, respectivly, for microbes that are involved in the anaerobic digestion (AD) process. Therefore, the present study aimed to enhance the methane yield of JPC by optimizing the alkaline pretreatment and co-digestion process conditions. The effects of NaOH concentration, incubation temperature, and retention time on methane and soluble chemical oxygen demand (sCOD) yields were evaluated and modeled by employing a response surface methodology coupled with central composite design (RSM-CCD). Moreover, a series of batch experiments with various feedstock concentrations (FCs) were tested to investigate the methane yield of JPC when co-digested with CG at different levels. The methane yields of all pretreated samples were significantly higher when compared with these of the untreated JPC. Pretreating the JPC using 7.32% NaOH at 35.86 °C for 54.05 h was the optimum conditions for maximum methane increment of 40.23% (353.90 mL g−1 VS), while co-digesting 2% CG with JPC at 2 g VS L−1 FC enhanced the methane yield by 28.9% (325.47 mL g−1 VS). Thus, the methane yield of JPC was effectively increased by alkaline pretreatment and co-digesting with CG. However, the alkaline pretreatment was relatively more effective compared with the co-digestion process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Alkaline and co-digestion pretreatments: process optimization for enhancing the methane yield of Jatropha press cake

Ewunie

Morken

Yigezu

2020

Biomass Conv. Bioref.

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“…Several empirical studies document these technology transfers and productivity increases: see e.g. Dries andSwinnen (2004, 2010), Gow et al (2000), , Minten et al (2009), Negash and Swinnen (2013). These studies find that technology (and management) transfer through value chains generates significant productivity increases both for the product itself and for other production activities at the farm level.…”

Section: E) Technology Transfer Through Value Chainsmentioning

confidence: 98%

“…Similarly,Negash and Swinnen (2013) find positive effects on food security of smallholder biofuel value chains in Ethiopia because of spillover effects through fertilizer access.…”

mentioning

confidence: 95%

Agricultural Trade and Development

Maertens¹,

Swinnen²

2015

WTO Working Papers

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The system of global agricultural and food trade is undergoing rapid processes of change, with important implications for economic development. In this paper we document and discuss these changes; including the rapid growth and structural change in agri-food trade, the increased consolidation in food supply chains, the proliferation of public and private food standards, high and volatile food prices, and increased vertical coordination in the chains. We investigate what the implications are of these changes for developing countries, for their participation in international agricultural trade as well as for economic development, income mobility and poverty reduction in rural areas.

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“…This issue was raised by both the international and local communities and led to a substantive narrowing of land being allocated to investors for the production of biofuel feedstock. Now, only what is categorized as marginal land can be used for biofuel production (Negash & Riera, 2014).…”

Section: Biofuel Policiesmentioning

confidence: 99%

Household Level Spillover Effects from Biofuels

Riera

Swinnen

2014

SSRN Journal

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Standard-Nutzungsbedingungen:Die Dokumente auf EconStor dürfen zu eigenen wissenschaftlichen Zwecken und zum Privatgebrauch gespeichert und kopiert werden.Sie dürfen die Dokumente nicht für öffentliche oder kommerzielle Zwecke vervielfältigen, öffentlich ausstellen, öffentlich zugänglich machen, vertreiben oder anderweitig nutzen.Sofern die Verfasser die Dokumente unter Open-Content-Lizenzen (insbesondere CC-Lizenzen) zur Verfügung gestellt haben sollten, gelten abweichend von diesen Nutzungsbedingungen die in der dort genannten Lizenz gewährten Nutzungsrechte. Terms of use: Documents in AbstractThe indirect effects of biofuels are mostly considered negative. In this paper, we argue that there may be a positive indirect effect of biofuels on food security and poverty. Our analysis shows that the introduction of castor production for biofuel in a poor country as Ethiopia can significantly improve food productivity of rural households who produce raw material for biofuel production. This spillover seems particularly linked to enhanced access to inputs and technical assistance which were provided as part of biofuel feedstock production contracts. Our results thus help nuancing the view that biofuels necessarily harm smallholders' food security.

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Biodiesel value chain and access to energy in Ethiopia: Policies and business prospects

Cited by 20 publications

References 45 publications

Alkaline and co-digestion pretreatments: process optimization for enhancing the methane yield of Jatropha press cake

Alkaline and co-digestion pretreatments: process optimization for enhancing the methane yield of Jatropha press cake

Agricultural Trade and Development

Household Level Spillover Effects from Biofuels

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