Assessment of the environmental impact of carnivorous finfish production systems using life cycle assessment

When evaluating the environmental impacts of finfish production systems, both regional impacts (e.g., eutrophication) and global impacts (e.g., climate change) should be taken into account. The life cycle assessment (LCA) method is well suited for this purpose. Three fish farms that represent contrasting intensive production systems were investigated using LCA: rainbow trout (Oncorhynchus mykiss) in freshwater raceways in France, sea-bass (Dicentrarchus labrax) in sea cages in Greece, and turbot (Scophtalmus maximus) in an inland re-circulating system close to the seashore in France. Two main characteristics differentiated the three farm systems: feed use and energy use. Emission of nitrogen and phosphorus accounted for more than 90% of each farm's potential eutrophication impact. In the trout and sea-bass systems, feed production was the major contributor to potential climate change and acidification impacts and net primary production use (NPPU). In these systems, the main source of variation for environmental impacts was the feed conversion ratio. Results from this study indicate that the sea-bass cage system was less efficient than the trout raceway system, with a higher level of potential eutrophication (65% greater) and NPPU (15% greater). The turbot re-circulating system was a high energy-consumer compared to the trout raceway system (four times higher) and the sea-bass cage system (five times higher). Potential climate change and acidification impacts were largely influenced by energy consumption in the turbot re-circulating system. In the turbot re-circulating system 86% of energy use was due to on-site consumption, while in the sea-bass cage farming system 72% of energy use was due to feed production. These results are discussed in relation to regional contexts of production and focus attention on the sensitivity of each aquatic environment and the use of energy carriers.     

Resource consumption and emissions from olive oil production: a life cycle inventory case study in Cyprus

“Cradle to gate” life cycle analysis (LCA) has been used to evaluate the consumption of raw materials and emissions of pollutants from olive oil production in Lythrodontas region in Cyprus, in order to identify the processes which give rise to the most significant environmental burdens. The system investigated includes the production of the chemical inputs used (fertilisers and pesticides), agricultural processes, the industrial processing and the transportation and waste management associated with olive oil production. Raw material and energy use as well as emissions were quantified on the basis of a functional unit of 1 l of extra virgin olive oil. The production of the inorganic fertilisers used in the agricultural stage of olive oil production and the disposal of liquid effluent from olive mills to evaporation ponds were found to be “hot-spot” processes not only in terms of resource consumption but also in terms of emissions into the environment.     

Mining life cycle modelling: a cradle-to-gate approach to environmental management in the minerals industry

It is common practise in mining Life Cycle Assessment (LCA) studies to use a predefined set of data to represent mining production systems. Besides this, very little is added to improve data quality, and essential mining process details which affect the ultimate environmental impacts is rarely taken into account. Some significant omissions include exploration and development work, mining method used, production, ore losses, location and the mining/processing method dependent factors that govern the nature of discharges to the environment. The mining system is often represented as a black-box, not lending itself to the interpretation of different processes used in minerals production. The generic data used are often inadequate for a mining LCA, and cannot be used as an accurate account of mining environmental burdens contributing to more complex systems “down-stream”, such as metals, building, chemical or food industries. Therefore, the main objective of the mining LCA model presented in this paper was to develop a tool that is able to represent the mining system in a comprehensive way. To attain this objective, the mining system was studied in more detail, as it is commonly practised during mine feasibility and design stages. It (LICYMIN) was developed as part of an international research project led by Imperial College London. The model integrates the mine production, processing, waste treatment and disposal, rehabilitation and aftercare stages of a mine's life within an LCA framework. The development work was carried out in collaboration with several industrial partners in Europe, including Bakonyi Bauxitbánya Kft. in Hungary. The model structure, database development and examples of field applications from industrial sites are presented.     

Assessment of tomato Mediterranean production in open-field and standard multi-tunnel greenhouse,with compost or mineral fertilizers,from an agricultural and environmental standpoint

This study presents detailed and comprehensive inventories on the horticultural production of tomato using compost (CM) or mineral fertilizers (M), in both open-fields (OF) and greenhouses (GH), providing information on the environmental impacts and assessing the agronomic viability of the four cultivation options. Life cycle assessment (LCA) was used to calculate the potential environmental impacts of the tomato production cycle per ton of product. The stages in the assessment included: mineral and organic fertilizers production, fertilizers transport, cultivation stage and greenhouse stage. The data were obtained experimentally in pilot fields and in an industrial composting facility using municipal organic waste, both located in the Mediterranean area. The results indicate that replacing a fraction of the mineral fertilizers dosage with compost is a good option, as this did not alter yield or fruit size parameters. Greenhouse protection increased infrastructure materials requirements but enhanced harvest by almost 50% and reduced the water and pesticides requirement. Compost production and greenhouse stages were the most impacting stages. Without subtracting the avoided burdens by composting and not dumping organic waste, the cultivation option OF_M had the lowest and OF_CM the highest impact. When avoided burdens were taken into consideration, the environmental impacts of the four cultivation options varied, depending on the impact category, with bigger differences due to fertilization as a variable rather than the production system.     

污染控制技术的清洁性及其LCA评估

运用LCA可对污染控制技术从“摇篮至坟墓”的生命周期角度考虑其清洁性 ,能确切地取得其生命周期内各阶段输入和输出的物料、能耗以及各种潜在环境影响的量化清单 ,并以此为基础进行环境影响评估和完善化分析。通过清洁性评估可有助于污染控制技术的创新、选择和决策 ,从而以最小的资源和环境代价去解决污染问题 ,满足我国可持续发展的战略要求     

生命周期评价在工农业生产中的应用研究

生命周期评价是指产品在整个生命周期中对环境的影响、对物质和能源的投入、产出进行汇集、测定的系统方法。从产品生命周期评价的发展过程和技术框架入手,对生命周期评价的意义以及工农业生产中的应用进行探讨,着重阐述了生命周期评价在农业生产、环保工艺、节能减排、清洁生产和环境管理中的应用。并认为生命周期评价应广泛用于环境治理领域,这是解决社会生产发展和环境污染之间矛盾的主要手段。     

Application of a Life Cycle Impact Assessment framework to evaluate and compare environmental performances with economic values of supplied coal products

The South African economy is strongly based on coal as a mined resource, and various grades of coal are supplied to local and international customers. However, the environmental impacts associated with the preparation and production of different coal grades from Run of Mine (RoM) or raw coal are variable; specifically, the different mining methods used for coal extraction – opencast or underground mining – have different environmental impacts. The entire life cycles of the grades of coal must therefore be evaluated in order to compare environmental performances with supplied economic values. In this paper, a Life Cycle Impact Assessment (LCIA) methodology, based on the ISO 14040 standard, is applied for this purpose. Four cases are considered in South Africa: typical high-grade and low-grade coals from opencast and underground mines.     

LCA of eucalyptus wood charcoal briquettes

This paper sets out to describe the environmental impact assessment for wood charcoal briquettes produced from eucalyptus wood in Brazil, with specific reference to those impacts associated with Global Warming Potential. To achieve that objective, the work was undertaken in accordance with ISO 14040 "Environmental management - Life cycle assessment - Principles and framework" which describes essential LCA characteristics and good practices. Charcoal briquettes are produced from two basic raw materials, charcoal fines and starch. The fines result from the production of charcoal from sustainably managed eucalyptus plantations. Starch is extracted from babaçu pulp in the Amazon region. Multi-output processes were allocated based on income from the different by-products. The results showed that more than 90% of incoming CO₂ was due to biomass production for charcoal, and the remainder to starch biomass production. Based on Brazilian data, as well as information provided by the GaBi4.3 database, it turned out that supplying the energy content of 1 kg of briquettes resulted in the sequestration of 3.9690 kg of CO₂, i.e. around 4 kg of CO₂ per kg of briquettes produced. CO₂ emissions throughout the briquette production process are totally compensated for by the environmental quality of the raw materials used.     

Assessing the environmental impact of metal production processes

Evaluating both new and existing processes for primary metal production to assess their environmental impacts is often difficult due to the many inputs and outputs involved. Life Cycle Assessment (LCA) is a methodology that can be used for such purposes to identify those parts of the metal production life cycle that have significant environmental impacts. LCA has been used by CSIRO Minerals to assess the “cradle-to-gate” environmental impacts of a number of metal production processes practised either currently or potentially in Australia. The metals considered included copper, nickel, aluminium, lead, zinc, steel, stainless steel and titanium, by both pyrometallurgical and hydrometallurgical routes in some instances. The environmental profile included greenhouse and acid rain gas emissions, solid waste emissions and gross energy consumption. The results for various metals are compared in this paper. New process technologies for primary metal production can be expected to reduce the environmental impacts of metal production, and estimates of likely reductions for technologies involving stainless steel, titanium and aluminium are also presented in this paper.     

Eco-labelling of wild-caught seafood products

Several eco-labels for wild-caught seafood have been developed during the last decade. This article describes and analyses the criteria applied by four different eco-labelling schemes for seafood products from capture fisheries, and discusses the criteria in terms of environmental impacts, based on the ISO 14040 standard for life cycle assessment.It is concluded that the most widespread eco-label, the Marine Stewardship Council (MSC), mainly addresses the fishing stage, in particular the overexploitation of marine resources. LCA studies confirm that the fishing stage represents the most significant environmental burden, but energy consumption and emissions of anti-fouling agents at the fishing or harvesting stage contribute with significant impacts that are not being addressed by international labelling initiatives for wild-caught seafood.LCA studies show that significant environmental impacts are related to the life cycle stages after landing. This includes fish processing, transport, cooling and packaging (especially for highly processed seafood products). Hence, another challenge would be to include criteria related to the post-landing consumption of energy, certain materials and chemicals, waste handling and wastewater emissions. Minimizing product losses throughout the product chain would also be an important area for future criteria in order to avoid fishing at high environmental costs only to produce something that is later wasted.The analysis shows that the Swedish KRAV is the only one that currently addresses a range of issues that include energy and chemicals in the whole life cycle of the products. International initiatives such as MSC cover fish products from many parts of the world emphasizing ‘overexploitation of fish resources’. It is recommended, however, that international initiatives such as MSC develop criteria related to energy use and chemicals – at least at the fishing stage. Over time, other life cycle stages could be addressed as well to the extent that this is manageable.     

啤酒的生命周期评价

本文在啤酒酿造阶段基础上,将原料种植及麦芽制备引入研究范围,利用Gabi5.0软件对啤酒进行从摇篮到大门的生命周期评价.各阶段考虑温室效应、酸化、富营养化、非生物资源消耗、人体潜在毒性、光化学毒性6种环境影响类型.结果表明,温室效应是啤酒生产对环境影响的主要类型,占总环境影响潜值43.75%,环境影响由强至弱分别为温室效应、富营养化、酸化、人体潜在毒性、光化学毒性和非生物资源消耗.灌装阶段是造成环境影响的主要阶段,占总环境影响潜值39.77%,种植阶段次之.其中灌装阶段的温室效应、非生物资源消耗、人体潜在毒性和光化学毒性影响潜值为啤酒生产各阶段最高值,种植阶段的富营养化、酸化影响潜值在各阶段最高.对灌装阶段采用传输管道改进,空压机热能回收、蒸汽二次利用等清洁生产方案降低能源消耗和环境影响,方案实施后蒸气和电能消耗分别减少247.66 MJ和4.46 k Wh,温室效应影响潜值减少19.18%,具有一定的环境效益和经济效益.     

Life Cycle Assessment of fossil energy use and greenhouse gas emissions in Chinese pear production

A Life Cycle Assessment (LCA) was performed to analyze environmental consequences of different pear production chains in terms of fossil energy use and greenhouse gas (GHG) emission in China. The assessment identified hotspots that contributed significantly to the environmental impacts of pear production from the cradle to the point of sale. The results showed that GHG emissions and fossil energy use varied in the different production chains because the environmental performance does not associate with the farming systems (i.e. organic vs. conventional), but is co-determined by farm topography and thus machinery use, by market demands to seasonality of products and thus the need for storage, and by local farming practices including manure management. The LCA could be used as a tool to guide selections of agricultural inputs with the aim of reducing environmental impacts. The results of the LCA analysis indicate that a list of choices are available to reduce energy use and GHG emission in the pear production chain, namely substitution of the traditional storage systems by an efficiently controlled atmosphere storage system, using manure for biogas production, conversion from the conventional farming to organic farming, and reduction of mechanical cultivation.     

LCA of spent fluorescent lamps in Thailand at various rates of recycling

This paper presents environmental impact of a fluorescent lamp (a long straight tube 36 watts, 200 g and 13,600 h for mean time before failure) when considering different disposal methods (recycle and non-recycle) of its spent fluorescent lamp (SFL). The study was applied for the case in Thailand using life cycle assessment (LCA) as a tool. All materials, energy use, and pollutant emissions to the environment from each related process were identified and analyzed. Impact assessment was conducted for 10 environmental impact potentials: carcinogens, respiratory organics, respiratory inorganics, climate change, radiation, ozone layer, ecotoxicity, acidification/eutrophication, land use and minerals. The analysis followed Eco-Indicator 99 method, individualist version 2.1. The main focus of the study was to compare the impact of SFL recycling with non-recycling before landfilling. The impact intermittent activities, production of raw material and energy used in all the concerned processes were taken into account. However, transportation activities were excluded. The results showed that for all recycling rates, cement production is the main contributor to the environmental impacts, while sodium sulfide production is second and electrical production, the third. Mercury vapor emission showed a small contribution in carcinogens and ecotoxicity. The impacts are reduced when recycling rate is increased. The reduction of cement consumption in disposal processes or the process improvement of cement production may also help to reduce environmental impacts.     

Global environmental consequences of increased biodiesel consumption in Switzerland: consequential life cycle assessment

This study assesses the direct and indirect environmental impacts to be expected if Switzerland should replace one percent of its current diesel consumption with imports of A) soybean methyl ester (SME) from Brazil, or B) palm methyl ester (PME) from Malaysia. In order to take into account possible future consequences, what-if scenarios were developed and assessed by means of a consequential LCA. In contrast to attributional LCA, the consequential approach uses system enlargement to include the marginal products affected by a change of the physical flows in the central life cycle. This means that the LCA considers all inputs and outputs which are linked to biodiesel production and that the product system is subsequently expanded to include the marginal products affected. Both future systems are assessed in comparison with the environmental scores of the fossil equivalent to biodiesel, i.e. diesel low in sulphur. The environmental burdens are measured by means of greenhouse gas emissions (GHG), land occupation and various non-aggregated and aggregated environmental impact indicators.In sum, the environmental impacts of an increased SME consumption depend on the environmental scores of the marginal replacement products on the world market, rather than on local production factors. In other words, the marginal products assumed to be affected are most important for the results obtained, i.e. in particular the marginal vegetable oil, fodder cake and land areas. In this study it is SME production increased at the expense of the available soybean oil which shifts the impacts associated with soybean oil production to the production of the marginal vegetable oils on the world market. In this perspective, it is not relevant in which country biodiesel production takes place, but rather which vegetable oil is involved. With respect to PME, the most relevant determining factor for the environmental impacts is the land area affected by the increased cultivation of oil palms. Currently, this expansion displaces primarily peat land and rain forest. This causes GHG emissions which are much higher than the emissions of the fossil reference. All in all, both PME from Malaysia and SME from Brazil cause more environmental impact than allowed by the Swiss tax redemption on agro-biofuels (max. 60% GHG emissions and 125% UBP of the fossil reference).     

Life cycle assessment of sunflower and rapeseed as energy crops under Chilean conditions

An option for the agriculture and energy sectors in Chile is the cultivation of energy crops, but environmental studies are first needed in the framework of a sustainable national energy policy.In this study, we used a cradle-to-farm gate Life Cycle Assessment (LCA) to compare environmental impacts and energy and water demand of rapeseed (Brassica napus L.) and sunflower (Helianthus annuus L.) in Chile, as potential oleaginous crops for first-generation biodiesel production. National agricultural data are used for the LCA inventory and process data of international databases are adapted to local conditions. The effect of field N₂O emissions and land use change is evaluated. The results indicate that, compared to sunflower, rapeseed production has a better environmental performance in 9 out of the 11 impact categories evaluated, and lower water consumption. The energy demand of rapeseed is 4.9 GJ/t seed, 30% less than that of sunflower. Mineral fertilizers cause the highest environmental impact in both crops. The analysis of the life cycle of fertilizers indicates that extraction of raw materials and its production are key stages. Attempts to reduce the environmental impact and energy requirement of both crops should be mainly associated with the evaluation of other types of fertilization. In addition, particularly for sunflower, low impact herbicides should be evaluated, seed yield improved and cultivation practices optimized. If the crops are produced on degraded grasslands, the greenhouse gas emissions may be reduced.     

国际贸易中的环境要项

环境要素在流动性决定了国际间环境与贸易的紧密联系。随着世界快速的经济一体化，将环境要项纳入国际贸易的规范、条款已势在必行。文章分析了环境成本内在化和ＩＳＯ１４０００的实质，它们的内在联系及在国际贸易中的作用和影响，提出了将ＩＳＯ１４０００作为实施环境成本内在化的参照规则的合理、可行性。     

Every product casts a shadow: but can we see it,and can we act on it?

This article presents a conceptual exploration of the use of environmental life cycle assessment (LCA) in environmental product policy. Environmental LCA is a scientific technique for evaluating the potential environmental impacts of a product, process or activity along its physical life cycle, i.e. from raw materials extraction to the disposal of released materials to nature. The utilization of LCA in environmental policy is evaluated here with the use of concepts from the research tradition of social studies of science and technology (SST). Three different ways of using LCA are identified: a definitive approach, a conceptual approach and a facilitative approach. Examples of each approach are presented and discussed. The strengths and weaknesses of the different approaches are analyzed, leading to the tentative conclusion that LCA works better as a conceptual or facilitative instrument than as a tool for gaining definitive support for specific policies. Finally, LCA is discussed as an illustration of the problems inherent in the current cause-oriented, integrative trend in environmental policy.     

以晶体硅太阳能电池产业为例的产业生命周期评价初探

面对日益复杂的环境问题和精细化环境管理需求,为了将生命周期评价在产业结构调整、发展方式转变中更好地发挥作用,对在产业层面开展生命周期评价的方法进行了探索研究.产业生命周期评价是在产品生命周期评价的基础上增加了:①基于“可拆解可组合”生态设计理念的功能单位和系统边界确定;②质量评估和数据整合的数据收集过程;③以不确定性分析来验证数据的合理性.选择晶体硅太阳能电池产业进行了产业生命周期评价的案例应用.结果表明:晶体硅太阳能电池产业可分为4个产品单元和11个工艺单元.基于上述产品单元和工艺单元的资源能源投入和污染物排放数据进行收集,在数据质量评估之后通过数据整合形成了产业生命周期数据清单.产业生命周期环境影响主要集中在呼吸系统影响（41.94%）、化石燃料（25.20%）、致癌（14.89%）和气候变化（8.80%）4个环境影响类别;减少环境影响的精准化途径是减少高纯多晶硅、硅片、电池片产品的电耗,组件产品中焊带消耗,硅片产品中的砂浆消耗和组件产品的铝合金边框消耗.蒙特卡洛分析结果显示,高纯多晶硅生命周期评价结果不确定性较高,与数据质量评估的结果较为一致.案例应用结果说明,产品生命周期评价可将生命周期评价从产品层面提升到产业层面,可为国家产业发展提供科学支撑.      

复合硅酸盐水泥的生命周期评价

掺加大量工业废渣的复合硅酸盐水泥其生产过程对生态环境有重要的影响.因此,本文利用Gabi 4.4软件,对复合硅酸盐水泥进行生命周期评价,比较分析生命周期各生产阶段中的非生物资源耗竭、全球变暖潜值、酸化效应、富营养化、人体毒性及光化学臭氧生成潜力等主要环境影响类型.结果表明,全球变暖潜值是复合硅酸盐水泥环境影响的主要类型,占总环境影响值的71％.环境影响大小顺序依次为全球变暖潜值、酸化效应、非生物资源耗竭、人体毒性、富营养化和光化学臭氧生成潜力.煅烧阶段的环境影响是最严重的,占整个生命周期影响值的68％.各生产阶段环境影响大小顺序依次为煅烧阶段、水泥粉磨、运输阶段、生料制备和原料开采阶段.煅烧阶段的全球变暖潜值、非生物资源耗竭和酸化效应的影响值为水泥生产各阶段最高值;粉磨阶段相比其他阶段具有最高的人体毒性和光化学臭氧生成潜力影响值;运输阶段产生了最高的富营养化污染值.本文对复合硅酸盐水泥的研究,为中国水泥生命周期评价提供了有效的基础数据,同时为推动水泥行业和建筑业的可持续发展提供了科学依据.     

不确定数据条件下的生命周期评价及其应用

针对产品生命周期评价中普遍存在着的不确定性数据问题，提出基于概率统计的方法，进行生命周期评价以及重要环境影响清单参数的识别与灵敏度分析。结合水源中央空调系统，建立了统计平均意义下的污染排放清单，运用MonteCarlo模拟获得了以均值219．746和方差9．4243所表征的空调机系统生命周期环境影响的概率分布。进一步通过K—S检验与灵敏度分析，识别出10个具有重要环境影响贡献的清单参数及其中4个对环境影响分布较敏感的参数。以概率分布代替固定数值可以反映产品环境绩效的统计信息，能够有效地用于不确定数据条件下的产品生命周期评价。