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Waste Management

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https://www.readbyqxmd.com/read/28529041/treatment-of-supermarket-vegetable-wastes-to-be-used-as-alternative-substrates-in-bioprocesses
#1
Ana Isabel Díaz, Amanda Laca, Adriana Laca, Mario Díaz
Fruits and vegetables have the highest wastage rates at retail and consumer levels. These wastes have promising potential for being used as substrates in bioprocesses. However, an effective hydrolysis of carbohydrates that form these residues has to be developed before the biotransformation. In this work, vegetable wastes from supermarket (tomatoes, green peppers and potatoes) have been separately treated by acid, thermal and enzymatic hydrolysis processes in order to maximise the concentration of fermentable sugars in the final broth...
May 18, 2017: Waste Management
https://www.readbyqxmd.com/read/28529040/pre-treatment-technologies-for-dark-fermentative-hydrogen-production-current-advances-and-future-directions
#2
Razieh Rafieenia, Maria Cristina Lavagnolo, Alberto Pivato
Hydrogen is regarded as a clean and non-carbon fuel and it has a higher energy content compared to carbon fuels. Dark fermentative hydrogen production from organic wastes is the most promising technology for commercialization among chemical and biological methods. Using mixed microflora is favored in terms of easier process control and substrate conversion efficiencies instead of pure cultures. However, mixed cultures should be first pre-treated in order to select sporulating hydrogen producing bacteria and suppress non-spore forming hydrogen consumers...
May 18, 2017: Waste Management
https://www.readbyqxmd.com/read/28529039/municipal-solid-waste-processing-and-separation-employing-wet-torrefaction-for-alternative-fuel-production-and-aluminum-reclamation
#3
Gea Fardias Mu'min, Pandji Prawisudha, Ilman Nuran Zaini, Muhammad Aziz, Ari Darmawan Pasek
This study employs wet torrefaction process (also known as hydrothermal) at low temperature. This process simultaneously acts as waste processing and separation of mixed waste, for subsequent utilization as an alternative fuel. The process is also applied for the delamination and separation of non-recyclable laminated aluminum waste into separable aluminum and plastic. A 2.5-L reactor was used to examine the wet torrefaction process at temperatures below 200°C. It was observed that the processed mixed waste was converted into two different products: a mushy organic part and a bulky plastic part...
May 18, 2017: Waste Management
https://www.readbyqxmd.com/read/28529038/plastic-debris-in-the-mediterranean-sea-types-occurrence-and-distribution-along-adriatic-shorelines
#4
Cristina Munari, Marco Scoponi, Michele Mistri
Small plastic debris in sediments from five beaches were investigated to evaluate their occurrence and abundance in the Northern Adriatic coast for the first time. Plastic debris extracted from sediments were counted, weighted and identified by Fourier-transform infrared spectroscopy (FT-IR). A total of 1345 items of debris (13.491g) were recorded, with a mean density of 12.1 items kg(-1) d.w. and 0.12gkg(-1) d.w. Fragments were the most frequent type of small plastics debris detected. In terms of abundance, microplastics (<5mm) accounted for 61% of debris, showing their wide distribution on Adriatic coasts, even far-away from densely populated areas...
May 18, 2017: Waste Management
https://www.readbyqxmd.com/read/28527864/effect-of-the-medium-s-density-on-the-hydrocyclonic-separation-of-waste-plastics-with-different-densities
#5
Shuangcheng Fu, Yong Fang, Huixin Yuan, Wanjiang Tan, Yiwen Dong
Hydrocyclones can be applied to recycle waste plastics with different densities through separating plastics based on their differences in densities. In the process, the medium density is one of key parameters and the value of the medium's density is not just the average of the density of two kinds of plastics separated. Based on the force analysis and establishing the equation of motion of particles in the hydrocyclone, a formula to calculate the optimum separation medium density has been deduced. This value of the medium's density is a function of various parameters including the diameter, density, radial position and tangential velocity of particles, and viscosity of the medium...
May 17, 2017: Waste Management
https://www.readbyqxmd.com/read/28527863/over-production-of-fermentable-sugar-for-bioethanol-production-from-carbohydrate-rich-malaysian-food-waste-via-sequential-acid-enzymatic-hydrolysis-pretreatment
#6
Halimatun Saadiah Hafid, Abdul Rahman Nor 'Aini, Mohd Noriznan Mokhtar, Ahmad Tarmezee Talib, Azhari Samsu Baharuddin, Md Shah Umi Kalsom
In Malaysia, the amount of food waste produced is estimated at approximately 70% of total municipal solid waste generated and characterised by high amount of carbohydrate polymers such as starch, cellulose, and sugars. Considering the beneficial organic fraction contained, its utilization as an alternative substrate specifically for bioethanol production has receiving more attention. However, the sustainable production of bioethanol from food waste is linked to the efficient pretreatment needed for higher production of fermentable sugar prior to fermentation...
May 17, 2017: Waste Management
https://www.readbyqxmd.com/read/28527862/production-of-ethanol-from-a-mixture-of-waste-paper-and-kitchen-waste-via-a-process-of-successive-liquefaction-presaccharification-and-simultaneous-saccharification-and-fermentation
#7
Hiroto Nishimura, Li Tan, Noriko Kira, Shigeo Tomiyama, Kazuo Yamada, Zhao-Yong Sun, Yue-Qin Tang, Shigeru Morimura, Kenji Kida
Efficient ethanol production from waste paper requires the addition of expensive nutrients. To reduce the production cost of ethanol from waste paper, a study on how to produce ethanol efficiently by adding kitchen waste (potentially as a carbon source, nutrient source, and acidity regulator) to waste paper was performed and a process of successive liquefaction, presaccharification, and simultaneous saccharification and fermentation (L+PSSF) was developed. The individual saccharification performances of waste paper and kitchen waste were not influenced by their mixture...
May 17, 2017: Waste Management
https://www.readbyqxmd.com/read/28526189/potential-impact-of-salinity-on-methane-production-from-food-waste-anaerobic-digestion
#8
Jianwei Zhao, Yiwen Liu, Dongbo Wang, Fei Chen, Xiaoming Li, Guangming Zeng, Qi Yang
Previous studies have demonstrated that the presence of sodium chloride (NaCl) inhibited the production of methane from food waste anaerobic digestion. However, the details of how NaCl affects methane production from food waste remain unknown by now and the efficient approach to mitigate the impact of NaCl on methane production was seldom reported. In this paper, the details of how NaCl affects methane production was first investigated via a series of batch experiments. Experimental results showed the effect of NaCl on methane production was dosage dependent...
May 16, 2017: Waste Management
https://www.readbyqxmd.com/read/28522166/development-and-validation-of-a-simplified-titration-method-for-monitoring-volatile-fatty-acids-in-anaerobic-digestion
#9
Hao Sun, Jianbin Guo, Shubiao Wu, Fang Liu, Renjie Dong
The volatile fatty acids (VFAs) concentration has been considered as one of the most sensitive process performance indicators in anaerobic digestion (AD) process. However, the accurate determination of VFAs concentration in AD processes normally requires advanced equipment and complex pretreatment procedures. A simplified method with fewer sample pretreatment procedures and improved accuracy is greatly needed, particularly for on-site application. This report outlines improvements to the Nordmann method, one of the most popular titrations used for VFA monitoring...
May 15, 2017: Waste Management
https://www.readbyqxmd.com/read/28511926/fresh-frozen-or-ambient-food-equivalents-and-their-impact-on-food-waste-generation-in-dutch-households
#10
Anke M Janssen, Mariska A Nijenhuis-de Vries, Eric P J Boer, Stefanie Kremer
In Europe, it is estimated that more than 50% of total food waste - of which most is avoidable - is generated at household level. Little attention has been paid to the impact on food waste generation of consuming food products that differ in their method of food preservation. This exploratory study surveyed product-specific possible impacts of different methods of food preservation on food waste generation in Dutch households. To this end, a food waste index was calculated to enable relative comparisons of the amounts of food waste from the same type of foods with different preservation methods on an annual basis...
May 13, 2017: Waste Management
https://www.readbyqxmd.com/read/28506599/application-of-vadose-zone-monitoring-system-for-real-time-characterization-of-leachate-percolation-in-and-under-a-municipal-landfill
#11
Imri Aharoni, Hagar Siebner, Ofer Dahan
Leachates from solid-waste landfills are considered a severe threat to groundwater quality. The fate of pollutants in the waste and underlying unsaturated zone is crucial for evaluating environmental risks and selecting a restoration strategy. In this study, a vadose-zone monitoring system (VMS) installed in a municipal landfill was used, for the first time, to continuously track leachates percolation dynamics and assess their chemical transformation across the entire thickness of the waste body (15m) and underlying unsaturated zone (16m) to the water table...
May 12, 2017: Waste Management
https://www.readbyqxmd.com/read/28502601/recycling-of-spent-lithium-ion-battery-with-polyvinyl-chloride-by-mechanochemical-process
#12
Meng-Meng Wang, Cong-Cong Zhang, Fu-Shen Zhang
In the present study, cathode materials (C/LiCoO2) of spent lithium-ion batteries (LIBs) and waste polyvinyl chloride (PVC) were co-processed via an innovative mechanochemical method, i.e. LiCoO2/PVC/Fe was co-grinded followed by water-leaching. This procedure generated recoverable LiCl from Li by the dechlorination of PVC and also generated magnetic CoFe4O6 from Co. The effects of different additives (e.g. alkali metals, non-metal oxides, and zero-valent metals) on (i) the conversion rates of Li and Co and (ii) the dechlorination rate of PVC were investigated, and the reaction mechanisms were explored...
May 11, 2017: Waste Management
https://www.readbyqxmd.com/read/28501264/challenges-around-automotive-shredder-residue-production-and-disposal
#13
Ala Khodier, Karl Williams, Neil Dallison
The challenge for the automotive industry is how to ensure they adopt the circular economy when it comes to the disposal of end-of-life vehicles (ELV). According to the European Commission the UK achieved a total reuse and recovery rate of 88%. This is short of the revised ELV directive target of 95% materials recovery, which requires a minimum of 85% of materials to be recycled or reused. A significant component of the recycling process is the production of automotive shredder residue (ASR). This is currently landfilled across Europe...
May 10, 2017: Waste Management
https://www.readbyqxmd.com/read/28501263/economic-and-environmental-review-of-waste-to-energy-systems-for-municipal-solid-waste-management-in-medium-and-small-municipalities
#14
J M Fernández-González, A L Grindlay, F Serrano-Bernardo, M I Rodríguez-Rojas, M Zamorano
The application of Directive 2008/98/CE on Municipal Solid Waste (MSW) implies the need to introduce technologies to generate energy from waste. Incineration, the most widely used method, is difficult to implement in low populated areas because it requires a large amount of waste to be viable (100,000 tons per year). This paper analyses the economic and environmental costs of different MSW-to-Energy technologies (WtE) in an area comprising of 13 municipalities in southern Spain. We analyse anaerobic digestion (Biomethanization), the production of solid recovered fuel (SRF) and gasification, and compare these approaches to the present Biological Mechanical Treatment (BMT) with elimination of the reject in landfill, and incineration with energy recovery...
May 10, 2017: Waste Management
https://www.readbyqxmd.com/read/28499798/pilot-trial-on-separation-conditions-for-diaper-recycling
#15
Kyung-Shin Kim, Hee-Sun Cho
By utilizing laboratory-scale tests, the optimal separation conditions for diaper recycling were identified, and then, these conditions were validated by a pilot trial. In this research, we determined the mass balances derived during various processing steps and identified the most feasible procedures to use for separating each material in the output flow. The results showed that drum screening was not able to remove all the fiber and super absorbent particles (SAP) in the plastic-rich fraction and that cellulose enzyme treatment can be a good solution...
May 9, 2017: Waste Management
https://www.readbyqxmd.com/read/28499797/the-s-an-a-%C3%A2-concept-semi-aerobic-anaerobic-aerated-bioreactor-landfill
#16
Luca Morello, Roberto Raga, Maria Cristina Lavagnolo, Alberto Pivato, Munawar Ali, Dongbei Yue, Raffaello Cossu
Hybrid Bioreactor Landfills are designed to enhance and speed up biological processes, aiming at reducing the duration of post operational phase until landfill completion. S.An.A.® (Semi-aerobic, Anaerobic, Aerated) concept consists in a Hybrid Bioreactor featuring a first semi-aerobic phase to enhance the methane production occurring in the following anaerobic step and a forced aeration for the abatement of the residual emissions. At the end of the last step, semi-aerobic conditions are restored and flushing applied for leaching residual non-biodegradable compounds...
May 9, 2017: Waste Management
https://www.readbyqxmd.com/read/28495227/lab-scale-co-digestion-of-kitchen-waste-and-brown-water-for-a-preliminary-performance-evaluation-of-a-decentralized-waste-and-wastewater-management
#17
Maria Cristina Lavagnolo, Francesca Girotto, Osamu Hirata, Raffaello Cossu
An overall interaction is manifested between wastewater and solid waste management schemes. At the Laboratory of Environmental Engineering (LISA) of the University of Padova, Italy, the scientific and technical implications of putting into practice a decentralized waste and wastewater treatment based on the separation of grey water, brown water (BW - faecal matter) and yellow water (YW - urine) are currently undergoing investigation in the Aquanova Project. An additional aim of this concept is the source segregation of kitchen waste (KW) for subsequent anaerobic co-digestion with BW...
May 8, 2017: Waste Management
https://www.readbyqxmd.com/read/28495226/a-gas-flow-model-for-layered-landfills-with-vertical-extraction-wells
#18
Shi-Jin Feng, Qi-Teng Zheng, Hai-Jian Xie
This paper developed a two-dimensional axisymmetric analytical model for layered landfills with vertical wells. The model uses a horizontal layered structure to describe the waste non-homogeneity with depth in gas generation, permeability and temperature. The governing equations in the cylindrical coordinate system were transformed to dimensionless forms and solved using a method of eigenfunction expansion. After verification, the effects of different well boundary conditions and gas extraction systems on recovery efficiency were investigated...
May 8, 2017: Waste Management
https://www.readbyqxmd.com/read/28487174/characterization-of-biochar-prepared-from-biogas-digestate
#19
Chao-Yi Hung, Wen-Tien Tsai, Jie-Wei Chen, Yu-Quan Lin, Yuan-Ming Chang
In the study, the biogas digestate was evaluated as a potential feedstock for preparing biochars at a broad temperature range of 300-900°C. The physico-chemical and pore properties of the resulting biochars (denoted as SDBC, solid digestate biochar), including calorific value (higher heating value), surface area/pore volume/pore size distribution, true density, scanning electron microscopy - energy dispersive X-ray spectroscopy (SEM-EDS) and X-ray powder diffraction (XRD), were studied. It was found that the higher heating values of the SDBC products were on a decreasing trend as pyrolysis temperature increased, but they indicated an increase in true density...
May 6, 2017: Waste Management
https://www.readbyqxmd.com/read/28483368/microwave-assisted-pyrolysis-of-halogenated-plastics-recovered-from-waste-computers
#20
Luca Rosi, Mattia Bartoli, Marco Frediani
Microwave Assisted Pyrolysis (MAP) of the plastic fraction of Waste from Electric and Electronic Equipment (WEEE) from end-life computers was run with different absorbers and set-ups in a multimode batch reactor. A large amount of various different liquid fractions (up to 76.6wt%) were formed together with a remarkable reduction of the solid residue (up to 14.2wt%). The liquid fractions were characterized using the following different techniques: FT-IR ATR, (1)H NMR and a quantitative GC-MS analysis. The liquid fractions showed low density and viscosity, together with a high concentration of useful chemicals such as styrene (up to 117...
May 5, 2017: Waste Management
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