Meat processing waste as a potential feedstock for biochemicals and biofuels – A review of possible conversion technologies

Okoro, Oseweuba Valentine; Sun, Zhifa; Birch, John

doi:10.1016/j.jclepro.2016.11.141

Cited by 71 publications

(67 citation statements)

References 170 publications

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“…The anticipated depletion of fossil resources in the nearest future together with their associated unfavorable environmental outcomes are driving research towards the exploration of promising alternative renewable resources. These alternative renewable resources include lignocellulosic biomass [1,2], animal manure and human sewage [3,4], meat processing waste [5,6] and aquatic biomass [7,8], which can be employed as biorefinery feedstocks. Among them, the lignocellulosic biomass represents a key feedstock, being abundant, safe, and cheap and it is mainly composed of three biopolymers (cellulose, hemicellulose and lignin), which are precursors of very valuable bio-products and biofuels [9,10].…”

Section: Introductionmentioning

confidence: 99%

Multi-Step Exploitation of Raw Arundo donax L. for the Selective Synthesis of Second-Generation Sugars by Chemical and Biological Route

et al. 2020

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Lignocellulosic biomass represents one of the most important feedstocks for future biorefineries, being a precursor of valuable bio-products, obtainable through both chemical and biological conversion routes. Lignocellulosic biomass has a complex matrix, which requires the careful development of multi-step approaches for its complete exploitation to value-added compounds. Based on this perspective, the present work focuses on the valorization of hemicellulose and cellulose fractionsof giant reed (Arundo donax L.) to give second-generation sugars, minimizing the formation of reaction by-products. The conversion of hemicellulose to xylose was undertaken in the presence of the heterogeneous acid catalyst Amberlyst-70 under microwave irradiation. The effect of the main reaction parameters, such as temperature, reaction time, catalyst, and biomass loadings on sugars yield was studied, developing a high gravity approach. Under the optimised reaction conditions (17 wt% Arundo donax L. loading, 160 °C, Amberlyst-70/Arundo donax L. weight ratio 0.2 wt/wt), the xylose yield was 96.3 mol%. In the second step, the cellulose-rich solid residue was exploited through the chemical or enzymatic route, obtaining glucose yields of 32.5 and 56.2 mol%, respectively. This work proves the efficiency of this innovative combination of chemical and biological catalytic approaches, for the selective conversion of hemicellulose and cellulose fractions of Arundo donax L. to versatile platform products.

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Section: Introductionmentioning

confidence: 99%

Multi-Step Exploitation of Raw Arundo donax L. for the Selective Synthesis of Second-Generation Sugars by Chemical and Biological Route

et al. 2020

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“…Therefore, the results suggest that for C/N ratios << 15, there will be an insufficient supply of carbon for digestion by the microbes, leading to suppressed growth of the methanogens [70]. Additionally, lower C/N ratios will result in excessive nitrogen content, thus increasing the risk of ammonia (NH 3 ) generation, a situation that is considered inhibitory to the AD process [1,70]. On the other hand, excessively high C/N ratios (>> than 15) in WHDS and SY co-digestion substrate mixtures will result in an increased risk of substrate acidification, a situation that is also inhibitive to the methanogenesis phase of the AD process [71].…”

Section: Vswhds: Vssymentioning

confidence: 99%

“…Previous investigations have proposed the feasibility of utilizing readily available meat processing waste streams as sustainable biorefinery feedstocks for biochemical and biofuel production [1]. Recent studies have demonstrated that meat processing dissolved air flotation (DAF) sludge can serve as a cheap and sustainable biodiesel feedstock via an integrated two-step in-situ hydrolysis and esterification pathway [2].…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1 shows that digestate handling requires a solid-liquid phase separation stage to enable the separation of the solid and the liquid phases [19]. Having separated the solid and the liquid phases, a portion of the separated liquid fraction is subjected to tertiary treatment via advanced oxidation technologies to sterilize the liquid fraction prior to its disposal in surrounding water bodies [1]. Another portion of the liquid fraction is recirculated to the AD digester to help replenish the microbial population, thereby sustaining the anaerobic degradation process.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the proposed hydrothermal liquefaction of the digestate will incorporate a single transformation step with product separation achieved simply by exploring the hydrophobicity of biocrude and the surface properties of biochar, such as porosity and particle size of the product streams [20]. The introduction of the HTL technology as a viable resource recovery strategy from biogas digestate residue will also eliminate the need for additional hygienisation treatments of any by-product streams due to the high temperature and high pressure operating conditions imposed during HTL processes [1]. Therefore, the present study hypothesizes that a shift from the traditional complex and costly digestate handling method to an alternative methodology that employs a one-step HTL processing of the digestate, will promote the efficient handling of the digestate with the additional benefit of enhanced resource recovery.…”

Section: Introductionmentioning

confidence: 99%

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Prognostic Assessment of the Viability of Hydrothermal Liquefaction as a Post-Resource Recovery Step after Enhanced Biomethane Generation Using Co-Digestion Technologies

2018

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In line with global efforts at encouraging paradigm transitions from waste disposal to resource recovery, the anaerobic co-digestion of substrates of wet hydrolyzed meat processing dissolved air flotation sludge and meat processing stock yard waste was investigated in the present study. It was demonstrated that the co-digestion of these substrates leads to the introduction of co-digestion synergizing effects. This study assessed biomethane potentials of the co-digestion of different substrate mixtures, with the preferred substrate mixture composed of stockyard waste and wet hydrolyzed meat processing dissolved air flotation sludge, present in a 4:1 ratio on a volatile solid mass basis. This co-digestion substrate mix ratio presented an experimentally determined cumulative biomethane potential of 264.13 mL/gVSadded (volatile solid). The experimentally determined cumulative biomethane potential was greater than the predicted maximum cumulative biomethane potential of 148.4 mL/gVSadded, anticipated from a similar substrate mixture if synergizing effects were non-existent. The viability of integrating a downstream hydrothermal liquefaction processing of the digestate residue from the co-digestion process, for enhanced resource recovery, was also initially assessed. Assessments were undertaken via the theoretical based estimation of the yields of useful products of biocrude and biochar obtainable from the hydrothermal liquefaction processing of the digestate residue. The environmental sustainability of the proposed integrated system of anaerobic digestion and hydrothermal liquefaction technologies was also initially assessed. The opportunity for secondary resource recovery from the digestate, via the employment of the hydrothermal liquefaction process and the dependence of the environmental sustainability of the integrated system on the moisture content of the digestate, were established. It is anticipated that the results of this study will constitute an invaluable basis for the future large-scale implementation of the proposed integrated system for enhanced value extraction from organic waste streams.

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Gas Therapy: Generating, Delivery, and Biomedical Applications

Ghaffari‐Bohlouli,

Jafari,

Okoro

et al. 2024

Small Methods

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Oxygen (O2), nitric oxide (NO), carbon monoxide (CO), hydrogen sulfide (H2S), and hydrogen (H2) with direct effects, and carbon dioxide (CO2) with complementary effects on the condition of various diseases are known as therapeutic gases. The targeted delivery and in situ generation of these therapeutic gases with controllable release at the site of disease has attracted attention to avoid the risk of gas poisoning and improve their performance in treating various diseases such as cancer therapy, cardiovascular therapy, bone tissue engineering, and wound healing. Stimuli‐responsive gas‐generating sources and delivery systems based on biomaterials that enable on‐demand and controllable release are promising approaches for precise gas therapy. This work highlights current advances in the design and development of new approaches and systems to generate and deliver therapeutic gases at the site of disease with on‐demand release behavior. The performance of the delivered gases in various biomedical applications is then discussed.

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Meat processing waste as a potential feedstock for biochemicals and biofuels – A review of possible conversion technologies

Cited by 71 publications

References 170 publications

Multi-Step Exploitation of Raw Arundo donax L. for the Selective Synthesis of Second-Generation Sugars by Chemical and Biological Route

Multi-Step Exploitation of Raw Arundo donax L. for the Selective Synthesis of Second-Generation Sugars by Chemical and Biological Route

Prognostic Assessment of the Viability of Hydrothermal Liquefaction as a Post-Resource Recovery Step after Enhanced Biomethane Generation Using Co-Digestion Technologies

Gas Therapy: Generating, Delivery, and Biomedical Applications

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