Search

Abstract: This special volume of the Journal of Cleaner Production was developed primarily based on materials presented at the 2nd International Workshop Advances in Cleaner Production held in São Paulo, Brazil, in 2009. The content reflects the growing awareness of the urgent and unavoidable need for making changes to help transform unsustainable to sustainable societies. The eleven papers provide different viewpoints to help society make progress on the journey towards sustainability. Key elements of this urgent journey are addressed in this collection of papers; some challenge society to address the problems in a systematic manner and some underscore the essentiality of proper planning by using green teams, or a Sustainable Environmental Management System. Other authors explored the role of proactive regulation and economic instruments to promote environmental performance improvements. Innovation through learning and promotion of multidisciplinary thinking as well as transference of information and knowledge between academy and industry are key aspects explored. Their inputs enabled this editorial team to propose alternatives uses for ‘wastes’, for substituting one raw material for another, which is environmentally and economically advantageous, for changing industrial process to decrease Greenhouse Gas emissions, or for optimizing diverse processes. The role of the Clean Development Mechanism as a promoter of implementation of innovative cleaner technologies in host countries is discussed. A systemic assessment tool, emergy synthesis, was employed to evaluate a reverse logistic enterprise from an environmental perspective. [Copyright &y& Elsevier]

Concern in relation to creating environmental protection policies is increasing, particularly with regard to the reuse of waste for power generation. In this context, biodiesel production from waste cooking oils could play an important role. Biodiesel is a biofuel that can be produced from saturated fatty raw material discarded by restaurants, such as oils and fats used for cooking processes. This paper describes a biodiesel production plant installed at Pinheira Beach in the State of Santa Catarina, southern Brazil and aims to discuss the environmental, social and economic impacts by analyzing the biodiesel production by life cycle assessment (LCA), relationship with the emission of greenhouse gases. The plant is run by an association and is aimed at promoting the recycling of waste cooking oil from restaurants and residences in the area and, at the same time, enables the continuity of artisanal fisheries in the region. The transesterification production process was used to convert waste cooking oils into biodiesel using basic catalysis in the presence of methanol. A batch system with the capacity to produce 200 L of biodiesel per day was adopted. The data obtained for the biodiesel produced at the plant were 879.2 kg m −3 density, 495.74 mg kg −1 water content, 94.38% ester content, and 1.5 mg.kg −1 sodium plus potassium. Related to the Life Cycle Assessment the results demonstrate that the category that most contributes to the emissions generated in biodiesel production process is the collection stage with 92.10% contribution, presenting a significant difference to the productions stage which contributed 7.9%. The plant provides environmental, social and economic gains for the community, for instance, increased income for the associates and fishermen, environmental education in schools, and cooking oil recycling opportunities. [ABSTRACT FROM AUTHOR]

In this paper the effects of an experimental bioethanol fumigation application using an experimental ultrasound device on performance and emissions of a single cylinder Diesel engine have been experimentally investigated. Engine performance and pollutant emissions variations were considered for three different types of fuels (biodiesel, biodiesel-bioethanol blend and biodiesel-fumigated bioethanol). Reductions in brake specific fuel consumption and NOx pollutant emissions are correlated with the use of ultrasonic fumigation of bioethanol fuel, comparative to use of biodiesel-bioethanol blend. Considering the fuel consumption as Diesel engine's main performance parameter, the proposed bioethanol's fumigation method, offers the possibility to use more efficient renewable biofuels (bioethanol), with immediate effects on environmental protection. [ABSTRACT FROM AUTHOR]

Abstract: Alongside with biofuel development, social acceptance issues have been underestimated. While social acceptance can emerge as powerful barrier for biofuel development, this article provides discussion on social acceptance in biofuel context. An acceptance framework based on life cycle biofuel production had been referred for a better understanding on social acceptance issues. Malaysia has been referred for the discussion as the country has faced with acceptance issue in their biofuel program. The discussion point out different societal groups will demand specific consideration for either support or oppose biofuel. This paper concludes that biofuel development will be constraint if social acceptance issues remain neglect. [Copyright &y& Elsevier]

Pongamia pinnata is one of the promising tree species suitable for providing oil for biodiesel production. This paper addresses the life cycle energy balance, global warming potential and acidification potential, of a small scale biodiesel system, in rural Karnataka. In addition, the system has also been expanded to generation and use of biogas from seed cake for electricity production and evaluated for its environmental impacts. The environmental impacts have been benchmarked with the life cycle impacts of fossil diesel. The results show that non-renewable energy requirement of Pongamia biodiesel system is twenty-eight times lower than that of fossil diesel. A significant increase in global warming potential (GWP) is indicated in Pongamia biodiesel system compared to fossil diesel if wood is used as fuel. GWP would be seven times less if wood is not used as fuel. Acidification and eutrophication potential of Pongamia system was found to be nil. Further, expanding the Pongamia biodiesel system to include biogas production exploits the energy available in the system. It is also observed that one hectare of Pongamia plantation is capable of completely sequestering the CO2 released during the life cycle with additional sequestration potential up to 1 t CO2 ha-1. Moreover, the above aspects were significantly superior in Pongamia system when compared to Jatropha biodiesel system. [ABSTRACT FROM AUTHOR]