scholarly journals Enhancing bioenergy production from food waste by in situ biomethanation: Effect of the hydrogen injection point

2021 ◽  
Author(s):  
Cynthia Kusin Okoro‐Shekwaga ◽  
Andrew Ross ◽  
Miller Alonso Camargo‐Valero
Keyword(s):  
Food Waste ◽  
Injection Point ◽  
Bioenergy Production

scholarly journals Development of antibacterial and UV protective cotton fabrics using plant food waste and alien invasive plant extracts as reducing agents for the in-situ synthesis of silver nanoparticles

Cellulose ◽  
2021 ◽  
Author(s):  
Nina Čuk ◽  
Martin Šala ◽  
Marija Gorjanc
Keyword(s):  
Silver Nanoparticles ◽  
Green Tea ◽  
Food Waste ◽  
Cotton Fabrics ◽  
Reducing Agent ◽  
Plant Food ◽  
Japanese Knotweed ◽  
Tea Leaves ◽  
Green Tea Leaves

Abstract The development of cellulose-based textiles that are functionalised with silver nanoparticles (AgNP), synthesised according to a green approach, and offer protection against ultraviolet (UV) radiation and pathogenic bacteria is very important today. In the present work we demonstrate the environmentally friendly approach to obtain such textile material by AgNP synthesis directly (in-situ) on cotton fabrics, using water extracts of plant food waste (green tea leaves, avocado seed and pomegranate peel) and alien invasive plants (Japanese knotweed rhizome, goldenrod flowers and staghorn sumac fruit) as reducing agents. The extracts were analysed for their total content of phenols and flavonoids and their antioxidant activity. The synthesised AgNP on cotton were round, of different size and amount depending on the reducing agent used. The highest amount of AgNP was found for samples where Japanese knotweed rhizome extract was used as reducing agent and the lowest where extracts of goldenrod flowers and green tea leaves were used. Regardless of the reducing agent used to form AgNP, all cotton samples showed excellent protection against E. coli and S. aureus bacteria and against UV radiation with UV protection factor values above 50. The best results for UV protection even after the twelve repetitive washing cycles were found for the sample functionalized with AgNP synthesised with an extract of the Japanese knotweed rhizome. Due to the presence of AgNP on cotton, the air permeability and thermal conductivity decreased. AgNP had no effect on the change in breaking strength or elongation of fabrics. Graphic abstract

Enhanced in-situ biomethanation of food waste by sequential inoculum acclimation: Energy efficiency and carbon savings analysis

2021 ◽  
Vol 130 ◽  
pp. 12-22
Author(s):  
Cynthia Kusin Okoro-Shekwaga ◽  
Andrew Barry Ross ◽  
Miller Alonso Camargo-Valero
Keyword(s):  
Energy Efficiency ◽  
Food Waste

Value Added Products from Agriculture, Paper and Food Waste: A Source of Bioenergy Production

2021 ◽  
pp. 91-126
Author(s):  
M. Subhosh Chandra ◽  
M. Srinivasulu ◽  
P. Suresh Yadav ◽  
B. Ramesh ◽  
G. Narasimha ◽  
...  
Keyword(s):  
Food Waste ◽  
Value Added ◽  
Bioenergy Production ◽  
Value Added Products

Enhanced biogas production and in situ ammonia recovery from food waste using a gas-membrane absorption anaerobic reactor

2019 ◽  
Vol 292 ◽  
pp. 121864 ◽  
Author(s):  
Xuchuan Shi ◽  
Jiane Zuo ◽  
Mengyu Zhang ◽  
Yajiao Wang ◽  
Heng Yu ◽  
...  
Keyword(s):  
Food Waste ◽  
Biogas Production ◽  
Membrane Absorption ◽  
Anaerobic Reactor ◽  
Ammonia Recovery

Effect of operational pH on biohydrogen production from food waste using anaerobic batch reactors

2014 ◽  
Vol 69 (9) ◽  
pp. 1886-1893 ◽  
Author(s):  
Chaeyoung Lee ◽  
Sewook Lee ◽  
Sun-Kee Han ◽  
Sunjin Hwang
Keyword(s):  
Food Waste ◽  
Fish Analysis ◽  
Batch Reactors ◽  
Clostridium Species ◽  
Ph Values ◽  
Species Cluster ◽  
Initial Ph ◽  
H2 Yield ◽  
Total Bacteria

This study was performed to investigate the influence of operational pH on dark H2 fermentation of food waste by employing anaerobic batch reactors. The highest maximum H2 yield was 1.63 mol H2/mol hexoseadded at operational pH 5.3, whereas the lowest maximum H2 yield was 0.88 mol H2/mol hexoseadded at operational pH 7.0. With decreasing operational pH values, the n-butyrate concentration tended to increase and the acetate concentration tended to decrease. The highest hydrogen conversion efficiency of 11.3% was obtained at operational pH 5.3, which was higher than that (8.3%) reported by a previous study (Kim et al. (2011) ‘Effect of initial pH independent of operational pH on hydrogen fermentation of food waste’, Bioresource Technology 102 (18), 8646–8652). The new result indicates that the dark fermentation of food waste was stable and efficient in this study. Fluorescence in situ hybridization (FISH) analysis showed that Clostridium species Cluster I accounted for 84.7 and 13.3% of total bacteria at operational pH 5.3 and pH 7.0, respectively, after 48 h operation.

Utilization of food waste for bio-hydrogen and bio-methane production: influences of temperature, OLR, and in situ aeration

2020 ◽  
Vol 22 (4) ◽  
pp. 1218-1226 ◽  
Author(s):  
Gamal Kamel Hassan ◽  
Bahaa Ahmed Hemdan ◽  
Fatma A. El-Gohary
Keyword(s):  
Food Waste ◽  
Methane Production

Centrifuge Modeling and Numerical Simulation of Air Sparging Process

2011 ◽  
Vol 378-379 ◽  
pp. 445-448
Author(s):  
Li Ming Hu ◽  
Heng Zhen Lee ◽  
Jian Wang ◽  
Jian Ting Du
Keyword(s):  
Numerical Simulation ◽  
Water Saturation ◽  
Cone Angle ◽  
Design Tool ◽  
Centrifuge Modeling ◽  
Air Sparging ◽  
Injection Point ◽  
Buoyant Force ◽  
In Situ Conditions

Air sparging (AS) is one of the in-situ groundwater remediation techniques for remediating volatile organic compounds (VOCs) contaminated soil, and the knowledge of air flow features is essential in designing air sparging system for soil remediation. The centrifuge modeling technique was employed to simulate the in-situ conditions and to investigate air follow characteristics during air sparging by using glass beads as soils. Several centrifugal modeling tests were performed under various g-levels. According to the test results, the zone of influence (ZOI) during air sparging is in a truncated-cone shape under various g-levels, which can be expressed by the lateral expansion around the air injection point and the cone angle between the vertical axis and the boundary of ZOI. A 2D numerical model is used to model the air movement during air sparging process. The ZOI and the water saturation distribution were obtained. The results agree well with the centrifuge test data, which indicates the two phase flow model is reasonable to simulate the air sparging process. It was also shown that air compressibility and buoyant force have a significant influence on the extent of ZOI and should be adequately considered. Hence centrifuge modeling and numerical simulation can be used as a design tool for in-situ air sparging system

Rapid in-situ composting of household food waste

2020 ◽  
Vol 141 ◽  
pp. 259-266
Author(s):  
Xule Zhou ◽  
Jiaqian Yang ◽  
Shuning Xu ◽  
Jiade Wang ◽  
Qingqing Zhou ◽  
...  
Keyword(s):  
Food Waste ◽  
Household Food
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