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Assessing the potential of crop residue recycling in China and technology options based on a bottom-up model

Frontiers of Environmental Science & Engineering 2014年第4期8卷 570-579页

作者： Lili QU Tianzhu ZHANG Wei LU Institute of Environmental Management and Policy School of Environment Tsinghua University Beijing 100084 China

Crop residues are an important biomass, and are significant in the sustainable development of China. This paper uses the Grey-Markov modeling approach, the cost-benefit analysis method, and the constraint optimiza- tion method to establish the potential of crop residue recycling in China （CRRC） using a bottom-up analysis. Taking 2010 as the baseline year, the CRRC model is used to determine the quantity trends of crop residue resources, simulating the recycling potential and selecting key crop residue recycling technologies for operation between 2010 and 2030. The results illustrate that the total residue output from different crops will gradually increase to 1062 million tons in 2030. The proportion of crop residue for field burning is expected to decrease as a result of guidance and support from the government. Market mechanisms are also improving the development of the crop residue recycling industry. The economic benefit of crop residue recycling is expected to be worth 132 billion CNY in 2030 according to technology structure options. Key crop residue recycling technologies preferred such as liquefaction, amination, silo, co-firing straw power and composting will account for more than 85% of the total benefits.

关键词： China crop residue recycling potential technology options

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Modelling recycling Targets:Achieving a 50%recycling Rate for Household Waste in Denmark

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Journal of Environmental Protection 2014年第7期5卷 627-636页

作者： Amanda Louise Hill Ole Leinikka Dall Frits Moller Andersen Department of Development and Planning Aalborg UniversityAalborgDenmark Institute of Chemical Engineering Biotechnology and Environmental TechnologyUniversity of Southern DenmarkOdenseDenmark DTU Management Engineering Technical University of DenmarkRoskildeDenmark

Within the European Union (EU) a paradigm shift is currently occurring in the waste sector, where EU waste directives and national waste strategies are placing emphasis on resource efficiency and recycling targets. The most recent Danish resource strategy calculates a national recycling rate of 22% for household waste, and sets an ambitious goal of a 50% recycling rate by 2020. This study integrates the recycling target into the FRIDA model to project how much waste and from which streams should be diverted from incineration to recycling in order to achieve the target. Furthermore, it discusses how the existing technological, organizational and legislative frameworks may affect recycling activities. The results of the analysis show that with current best practice recycling rates, the 50% recycling rate cannot be reached without recycling of household biowaste. It also shows that all Danish municipalities will need to make efforts to recover all recyclable fractions, and that the increased recycling efforts of only selected municipalities will not be sufficient to reach the target.

关键词： recycling Rate recycling potential Household Waste Econometric Modeling Waste Management

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