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Resources Conservation and Recycling
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7.04
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Abstract Background Digested sludge is a good source of plant nutrients. However, depending on the feedstock, it might contain heavy metals, metalloids, organic compounds, pathogens, and pharmaceuticals, which can cause adverse effects on crop growth and contaminate the groundwater, soil, and food chain. Scope The aim of this review is to focus on the potential risks of inorganic and organic contaminants to plant growth, soil, groundwater, and consequently the food chain and environment related ...
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Abstract The study compares life cycle environmental implications of two construction and demolition waste (C&DW) management alternatives, inert landfilling and integrated wet recycling, on many impact categories under several scenarios. Integrated wet-recycling valorizes coarse aggregates, sand, and soil, recovering over 95 percent of incoming C&DW waste. Using data from recycling plants operational in New Delhi complemented by the ecoinvent database, the study deploys SimaPro software and expl...
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Abstract As society works to reduce its reliance on fossil fuels, the demand for renewable energy has grown rapidly in recent years. Photovoltaic (PV) solar power is one such source of renewable energy and has seen significant growth over the past several decades. While End of Life (EoL) PV volumes remain relatively small at this time, the number of EoL PVs is estimated to grow dramatically in the near future. This raises concerns about the management of EoL PVs. Effective EoL management methods...
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Abstract Humans are extracting and consuming unprecedented quantities of materials from the crust of the Earth. Contributing to this consumption, university campuses require large amounts of materials to operate. This offers opportunities for the implementation of circular economy principles that optimise material use and demonstrate best practice to future generations of decision makers, globally. This paper uses the Parkville campus of the University of Melbourne as a single revelatory case st...
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Abstract The environmental impact potentials of producing bioethanol from corn stover were systematically assessed by life cycle assessment using datasets reported in the literature. The 15% best datasets with respect to global warming potential for seven different technological configurations were extracted from a published database reviewing 474 publications on converting corn stover to bioethanol. A total of 10 impact categories were evaluated. The impacts included both environmental loads an...
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Abstract This work is about simultaneous devulcanization and chemical functionalisation of waste styrene butadiene rubber vulcanizate (SBR) using thermo-mechanical treatment and sulphide based multifunctional devulcanizing agent. The as-grown compounds are reinforced with nano-silica and re-vulcanized to prepare rubber composites. The curing and processing characteristics, and mechanical performance are further compared with those of conventional silica based green tire formulations. The extent ...
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Abstract With increasing amount of sewage sludge becoming an urgent and inevitable issue for every country, its applications in the production of construction and building materials provide an alternative solution for sludge disposal and resource recovery. Similar to clay and Portland cement, the main oxides in sewage sludge are SiO2 (10–25 %), Al2O3 (5–10 %) and CaO (10–30 %) which are increased in sludge ash after incineration to 25–50 %, 10–20 % and 15–30 %. Therefore, this solid waste can be...
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Abstract In developing countries, municipal solid waste management (MSWM) is a complex task because, in addition to economic and environmental aspects, there is also the social aspect represented by the scavenger, an informal worker in the recycling chain, who actively participates in the collection, classification and commercialization of municipal solid waste with recyclable potential (MSWRP). Grounded on an integrative bibliographical review, this study aims to longitudinally reveal the socio...
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Abstract China has long been the world’s leading plastic waste importer. However, in January 2018 the Chinese Government enacted a new policy to permanently ban the import of most plastic waste into the country. This raises an important question: what will the impact of this policy be both domestically and globally? It is argued that the answer to this question can in part be systematically revealed by employing three methods of analysis. (1) A combined multiregional input-output model with stru...
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Abstract Tetrakis (hydroxymethyl) phosponium chloride ionic liquid was evaluated to recover carbohydrates, especially cellulose, from municipal wastewater treatment plant (WWTP) primary sludge (96 % water content). Different process operative conditions were evaluated: temperature (35, 60 and 80 ℃), time (6, 13 and 20 h) and sludge weight:ionic liquid volume ratio (1 g TS of SLUDGE: 7, 12 and 17 mL). A three levels, three factors central design was applied to optimize the procedure of recovery o...
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Top fields of study
Engineering
Waste management
Sustainability
Municipal solid waste
Environmental engineering