Potential utilization of commercial waste in Jakarta as alternative fuel by cement industry.

As the capital city of Indonesia, Jakarta had a population of 10.2 million in 2015 that generated 6200 metric tonnes (Mt) day-1 of municipal waste in the 2017-2019 period. In the composition of the waste, as much as 9% is contributed by the commercial sector. This research focuses on five shopping areas in Jakarta (commercial areas (CAs)). The five CAs produce 110 Mt of waste per day and 79% of them are disposed of in landfills. 95% of the waste is a combustible fraction which can be used as an alternative fuel by the cement industry because the fraction has a low heating value of around 24 MJ kg-1. It is estimated that in one year, the CAs can produce about 34,500 Mt of alternative fuel with 820 TJ of energy. Approximately, the resulting energy savings are 2.6% which is equal to approximately 35,500 Mt of coal. In addition, the utilization of alternative fuel can reduce carbon dioxide emissions by 1.7% or 50,000 Mt.

Clean construction and demolition waste material cycles through optimised pre-demolition waste audit documentation: A review on building material assessment tools.

Waste from the construction sector poses huge challenges for sustainable waste management. This is not only due to the vast amount of waste produced in construction and demolition activities, but also due to pollutants potentially contained in these products. Subject to these conditions, waste management must ensure recovery of as many resources as possible, while making sure to keep material loops clean. This demanding task requires more knowledge about the existing building stock and an adaptation of current demolition processes. Innovative technologies, such as Building Information Modelling, or modern frameworks, such as Geographic Information Systems, offer a high potential to synoptically provide stock material information for future demolition activities for individual objects to be deconstructed as well as for whole cities as a basis for managing the anthropogenic stock and potential urban mining. Suitable methods of data collection allow for acquiring the desired input for the generation of building stock models enriched with demolition-related information. With the latter, selective deconstruction strategies as well as appropriate waste stream routing agendas can be planned and executed, thereby securing safety at work during the demolition process itself and a waste stream routing according to the waste hierarchy. This review article gives an overview of currently deployed building material assessment tools (data capture and visualisation), both a prerequisite for improved information on materials and geometry (and thereby mass/volume). In addition, this article describes workflows employable for the purpose of urban mining in end-of-life buildings, of which one holistic approach will be described in depth.

Succeeding in involving decision-makers in solid waste management planning by setting appropriate goals and providing a structured planning method.

Even though the relevance of solid waste management goals for our societies becomes more and more acknowledged around the globe, one of the major challenges is to get the level of attention needed from those who are responsible for making the decisions. Waste management is one issue among others of the issues policy-makers do have to take care of, but many times other issues seem to have a higher priority. This prioritization often is also based on the aim of achieving short term effects and does not take into account infrastructural synergies that may be realized when tackling waste management issues as well as middle and long-term effects of addressing or neglecting waste management challenges, even though when basic waste management needs are addressed there are interfaces between the waste sector and the producing sectors that need to be handled in a reasonable way in order to allow for securing that pollutants and harmful substances are being concentrated in the waste management sphere and a portion of secondary materials as high as possible is being recycled. This paper shows examples of the challenges addressed and proposes how these could be handled in the future for the sake of the implementation of a circular economy.

Holistic assessment of a landfill mining pilot project in Austria: Methodology and application.

Basic technical and economic examinations of Austrian mass waste landfills, concerning the recovery of secondary raw materials, have been carried out by the 'LAMIS - Landfill Mining Austria' pilot project for the first time in Austria. A main focus of the research - the subject of this article - was the first devotion of a pilot landfill to an integrated ecological and economic assessment so that its feasibility could be verified before a landfill mining project commenced. A Styrian mass waste landfill had been chosen for this purpose that had been put into operation in 1979 and received mechanically-biologically pre-treated municipal waste till 2012. The whole assessment procedure was divided into preliminary and main assessment phases to evaluate the general suitability of a landfill mining project with little financial and human resource expense. A portfolio chart, based on a questionnaire, was created for the preliminary assessment that, as a result, has provided a recommendation for subsequent investigation - the main assessment phase. In this case, specific economic criteria were assessed by net present value calculation, while ecological or socio-economic criteria were rated by utility analysis, transferring the result into a utility-net present value chart. In the case of the examined pilot landfill, assessing the landfill mining project produced a higher utility but a lower net present value than a landfill leaving-in for aftercare. Since no clearly preferable scenario could be identified this way, a cost-revenue analysis was carried out in addition that determined a dimensionless ratio: the 'utility - net present value quotient' of both scenarios. Comparing this quotient showed unmistakably that in the overall assessment, 'leaving the landfill in aftercare' was preferable to a 'landfill mining project' in that specific case.

Municipal solid waste development phases: Evidence from EU27.

Many countries in the European Union (EU) have very developed waste management systems. Some of its members have managed to reduce their landfilled waste to values close to zero during the last decade. Thus, European Union legislation is very stringent regarding waste management for their members and candidate countries, too. This raises the following questions: Is it possible for developing and developed countries to comply with the European Union waste legislation, and under what conditions? How did waste management develop in relation to the economic development in the countries of the European Union? The correlation between waste management practices and economic development was analysed for 27 of the European Union Member States for the time period between 1995 and 2007. In addition, a regression analysis was performed to estimate landfilling of waste in relation to gross domestic product for every country. The results showed a strong correlation between the waste management variables and the gross domestic product of the EU27 members. The definition of the municipal solid waste management development phases followed a closer analysis of the relation between gross domestic product and landfilled waste. The municipal solid waste management phases are characterised by high landfilling rates at low gross domestic product levels, and landfilling rates near zero at high gross domestic product levels. Hence the results emphasize the importance of wider understanding of what is required for developing countries to comply with the European Union initiatives, and highlight the importance of allowing developing countries to make their own paths of waste management development.

Landfill mining: Resource potential of Austrian landfills--Evaluation and quality assessment of recovered municipal solid waste by chemical analyses.

Since the need for raw materials in countries undergoing industrialisation (like China) is rising, the availability of metal and fossil fuel energy resources (like ores or coal) has changed in recent years. Landfill sites can contain considerable amounts of recyclables and energy-recoverable materials, therefore, landfill mining is an option for exploiting dumped secondary raw materials, saving primary sources. For the purposes of this article, two sanitary landfill sites have been chosen for obtaining actual data to determine the resource potential of Austrian landfills. To evaluate how pretreating waste before disposal affects the resource potential of landfills, the first landfill site has been selected because it has received untreated waste, whereas mechanically-biologically treated waste was dumped in the second. The scope of this investigation comprised: (1) waste characterisation by sorting analyses of recovered waste; and (2) chemical analyses of specific waste fractions for quality assessment regarding potential energy recovery by using it as solid recovered fuels. The content of eight heavy metals and the net calorific values were determined for the chemical characterisation tests.