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Waste - PubMed

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Last Updated: 27 September 2022

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Direct evidence on occurrence of emerging liquid crystal monomers in human serum from E-waste dismantling workers: Implication for intake assessment.

LCMs were detected in occupational serum samples from an e-waste dismantling zone in South China for the first time. Potential common uses and similar sources to the LCMs in occupational workers, according to the correlation analysis of individual LCMs. Moreover, the estimated daily intake of the LCMs in the occupational workers was much higher than those in the reference areas, indicating a significantly higher risk of e-waste dismantling workers.

Source link: https://doi.org/10.1016/j.envint.2022.107535


Influence of preparation techniques of cellulose II nanocrystals as reinforcement for tannery solid waste-based gelatin composite films.

A functional characteristics and potential use as a biodegradable packaging material are investigated for Tannery waste-based gelatin composite film reinforced with cellulose II nanocrystal extracted from wet wipes using three different hydrolysis methods. When compared to a control gelatin film, the highly crystalline CNC II incorporation added mechanical stiffness to rawhide trimming waste-based gelatin films by 50%. Maximum thermal decomposition with Tmax of 329 %u00b0C was achieved in gelatin films with PCNC nano-reinforcement. Films with CNC II were chemically stable and highly antibacterial against Gram-positive S. aureus microbial strains. Strong interfacial non-covalent and hydrogen bonding interactions between gelatin and cellulose II nanocrystal have improved the composite films' properties. As shown by the transmittance value T280 of 0. 1 percent, CNC II's incorporation of CNC II reduced the surface wettability of the films and nanocomposites absorb UV radiation. Within 7 days of soil burial, nanocomposite films degraded to 79. 9% of the initial mass.

Source link: https://doi.org/10.1007/s11356-022-23058-w


Two-stage anaerobic membrane bioreactor for co-treatment of food waste and kitchen wastewater for biogas production and nutrients recovery.

Organic waste and wastewater co-digestion is getting more attention as a viable waste management strategy for energy recovery. This work introduced a two-stage Anaerobic Membrane Bioreactor, a hydrolysis reactor, and an Aerobic membrane bioreactor for long-term co-digestion of food waste and kitchen wastewater in a two-stage Anaerobic Membrane Bioreactor. Specific methane production of UASB was found to be 249 u00b1 7 L CH4 kg-1 CODremoved, according to the OLR of 6. 9 kg TCOD m-3 d-1. Hydrolysis caused the least amount of input TCOD load to be reduced by 21. 6 percent at the hydraulic retention time of 2 days. However, low total volatile fatty acid concentrations were discovered in the AnMBR, indicating that a high hydrolysis rate could be achieved with a short HRT. Also, the predominance of fine particles in the ultrafiltration membrane housing could lead to a faster rise in trans-membrane pressure during the filter process.

Source link: https://doi.org/10.1016/j.chemosphere.2022.136537


Biochar addition augmented the microbial community and aided the digestion of high-loading slaughterhouse waste: Active enzymes of bacteria and archaea.

Following the introduction of biochar at 6% and 8% slaughterhouse waste loadings, biogas production, volatile fatty acids, microbial populations, and microbes' active enzymes were investigated. An increase in biochar up to 1. 5% resulted in a decrease in BP at 6% SHW. Compared to control, VFAs production in all 0. 55 biochar amended reactors was highly effective. In 6% and 8% SHW, respectively, the two most prominent number of OTUs at 0. 5 biochar was 567 and 525. In the Methanosaeta and Methanosphaera agarry abundance, in which the main enzymes were reduced and hydrogenase were reduced, and hydrogenase, was increased.

Source link: https://doi.org/10.1016/j.chemosphere.2022.136535


Sustainable utilization of unavoidable food waste into nutritional media for the isolation of bacterial culture for the removal of heavy metals.

In the pig bone medium, the batch culture of Comamonas terrae demonstrated growth stability for 16 days. Cd Cr Pb and Zn terrae's high metal removal rates were demonstrated by the C. terrae. The C. terrae can effectively remove HM and C. terrae from the study, according to the report, the terrae of C. terrae can be used for bioremediation of HM. Hence, pig bone waste is a cost-effective medium and a good substitute for the vaping and reuse of FW in accordance with the circular economy.

Source link: https://doi.org/10.1016/j.biortech.2022.128000


Roasting mechanism of lightweight low-aluminum-silicon ceramisite derived from municipal solid waste incineration fly ash and electrolytic manganese residue.

Municipal solid waste incineration fly ash and electrolytic manganese residue remain in hazardous waste and must be disposed of prior to processing. The low amount of silicon and aluminum at low roasting temperatures was discovered to meet the expansion mechanism of lightweight aggregates. The content of heavy metal in ceramisite was consistent with the requirement of soil environmental quality for growth GB 36600-2018 Class I, and PCDD/Fs in ceramisite were 2. 0 ng I-TEQ/kg, which was safe.

Source link: https://doi.org/10.1016/j.wasman.2022.09.011


Hydroxyapatite catalyzed hydrothermal liquefaction transforms food waste from an environmental liability to renewable fuel.

Combining HAP with a low homogeneous base increased biocrude yield from 14 u00b1 1 to 37 %, resulting in the recovery of 49 percent of the energy contained in the food waste feed's recovery of 49 %. According to an economic and environmental report, the new technology has the ability to reduce U. S. greenhouse gas emissions by 2. 6 percent while producing renewable diesel at a minimum fuel selling price of $1. 06/GGE. HAP will play a vital role in transitioning food waste from a burden to a renewable fuel.

Source link: https://doi.org/10.1016/j.isci.2022.104916


Enhancement of anaerobic digestion by co-digesting food waste and water hyacinth in improving treatment of organic waste and bio-methane recovery.

Food waste which has high organic content accounts for 57% of the municipal solid waste generated in Kenya. However, the conversion and bioconversion of FW to biogas has always been difficult, due to rapid hydrolysis, accumulation of volatile fatty acids, and lower pH in the bioreactor. In this research, the anaerobic digestibility of FW as a mono substrate was compared to co-digestion of FW with water hyacinth for improved biogas production and organic matter removal in a laboratory batch reactor. The average gas yields after 81 days for the various mix proportions were 256. 27 and 357. 69 ml/g-VS for mono-digestion of WH and FW respectively, according to the researchers. The average estimated biogas production for WH's mixtures was 305. 01, 548. 91,616. 01, and 270. 87 ml/g-VS for mixtures of 30:85, 70:15, 30:15, and 85:15 were 305. 01, 548. 31, 548. 20, 548. 60, and 85:15, respectively. The digesters with WH and FW alone had lag times of 2. 599 and 1. 052 days respectively, according to the updated Gompertz system. According to Rmax, a mix of 70:30 had the most maximum specific biogas production Rmax and the highest maximum biogas production capacity of 18. 19 mlCH4/gVS per day and 607. 7 million gVS respectively, with a maximum specific biogas production capacity of 18. 19 mlCH4/gVS per day and 607. 7 millionlCH4/gVS respectively. The study finds that the co-digestion of WH and FW in the mix ratio of 70:30 increased the volume of biogas produced and organic matter removal effectiveness by 79%.

Source link: https://doi.org/10.1016/j.heliyon.2022.e10580


Effect of Fuel Preheating on Engine Characteristics of Waste Animal Fat-Oil Biodiesel in Compression Ignition Engine.

The present research aims at investigating the effects of fuel preheating in a single-cylinder CI engine, with the preheating process proving an efficient method for improving the fuel's quality. The WAF-O biodiesel was preheated to 60, 80, 100, and 120 b0C, and was tested along with neat diesel and unheated WAF-O biodiesel to determine the effects of the preheated fuel. According to a study, preheating of WAF-O biodiesel reduced its specific fuel consumption and improved its brake thermal efficiency by 7. 86% and 9. 23%, respectively. Preheating WAF-O biodiesel resulted in reduced carbon monoxide, nitrous oxide, and hydrocarbon pollution reduction by 13. 8 percent, 21. 9 percent, and 24. 4 percent, respectively, with increased carbon dioxide emissions by 7. 5 percent.

Source link: https://doi.org/10.3390/polym14183896


Innovative Closed-Loop Recyclable Bio-Based Composites from Epoxidized Waste Flour and Recycled Carbon Fibers.

Precursors that result from fossil fuel-based raw materials should be replaced with eco-friendly sources in order to minimize their environmental impact. Both approaches were considered in this paper, using epoxidized waste flour, an innovative bio-precursor derived from the organic waste stream, and a cleavable hardener, which allowed the matrix's recyclability. A green recycling process was then tested, which required the use of non-toxic solvents and mild working conditions, and resulted in the matrix recovery and preservation of the carbon fibers' characteristics while also preserving the fibers' properties. The epoxy rings were found on the recycled waste flour, according to FTIR analysis, which revealed the presence of the epoxy ring on the recycled waste flour. Hence, recycled waste flour was once more used as a precursor and mixed with the cleavable hardener, resulting in a closed-loop recycling.

Source link: https://doi.org/10.3390/polym14183878

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions