Day 2 :
Keynote Forum
Maria Holuszko
University of British Columbia, Canada
Keynote: High voltage pulse fragmentation for metal liberation from waste LED lamps
Biography:
Maria Holuszko has more than 25 years of experience in Mineral and Coal Processing Engineering working with industry, academia, and government. Her first position was at the University of Alberta, followed by the Alberta Research Council. In the 1990s she held a Senior Licensed Scientist positon at the British Columbia Ministry of Energy in Victoria, BC and she was engaged in consulting work for the mining industry before she decided to pursue her PhD studies at UBC. After completing her PhD degree in 2006, she moved to Australia to work at the Julius Kruttschnitt Mineral Research Centre, the Center of Excellence for Mineral Processing at the University of Queensland. Currently she is working as an Assistant Professor in Mineral Processing and Urban Mining Engineering Department at University of British Columbia, Canada. Her main research interest includes Mineral and Coal Processing, Minerals and Coal Characterization, Coal and Biomass utilization, Urban Mining.
Abstract:
Lighting products are the most commonly used electrical products around the globe. With the improvement in lamp technologies, lighting products have grown complex. These lamps consist of various valuable metals, non-metals and traces of hazardous substances. A major step in the metal recovery process is size reduction. SELFRAG is a high voltage selective fragmentation comminution technology that uses high voltage pulses to efficiently separate the metals at coarse size as the breakage occurs along the interface/boundary thus enhancing selective comminution. Since the process utilizes a water medium, the loss of fines would be minimized and the liberation occurring at a coarser size should improve the recovery in the subsequent processes. This research looked into the applicability of high voltage pulse fragmentation for light emitting diodes (LED) lamps. Eight different types of LED lamps were processed through the SELFRAG unit at varying pulses to study metal liberation. The product obtained was characterized for metal liberation, metal grades, and liberation analysis. The specific energy consumption for this size reduction process was also monitored. The results showed that the high voltage can liberate metal at the coarser fraction without generating too much fine. With the increase in input energy, the degree of liberation for various components increased for the coarsest size fraction. On the other hand, LED lamps with metallic casing were not affected by the high voltage and hence no breakage was observed. At the same time, the energy is very high compared to the conventional crushing and grinding technology used in the mining industry.
Keynote Forum
Muhammad Abdul Jalil
Bangladesh University of Engineering and Technology, Bangladesh
Keynote: Investigation of biogas generation from the wastes of a vegetable market of Bangladesh
Biography:
Abdul Jalil has completed first grade junior scholarship, Education Board scholarship, and BUET merit scholarship. He received his BSc in Civil Engineering in 1986 from BUET. He obtained his MSc in Civil Engineering in 1988 specializing in Environmental Engineering from the same university. He received his PhD in Civil Engineering in 1993 from Tokyo University, Japan under Asian Development Bank Scholarship. He conducted Postdoctoral Research on Water Management in Loughborough University, UK under Commonwealth Fellowship during 2005-2006. He was appointed as a Lecturer in the Department of Civil Engineering of BUET in 1986 just after his graduation. He was promoted to the post of Assistant Professor in 1989. He became an Associate Professor in 1996. He was appointed as a Professor in 2001. He has published over 37 papers up to now in international and national journals, proceedings of conferences and seminars. He presented a number of papers in home and abroad. He has worked a member of different committees of national organizations. He worked in a number of national and international research projects. He also works as a Consultant and completed over 45 important national development projects.
Abstract:
This paper presents the results of two sets of laboratory experiments on biogas generation from the wastes of a rural market of Bangladesh. Only the easily biodegradable wastes were used as the substrate for biogas production. Daily average composition of the wastes was used in the experiments. Cow dung, cauliflower stick, papaya and potato were the major biodegradable wastes. The average total solids (TS) and volatile solids (VS) concentrations of the raw substrate were determined and found to be 17.84% and 13.85% respectively. The experimental setups were placed in a large closed chamber containing a room heater. The room heater was operated at 35°C to maintain a favorable condition for anaerobic digestion of the substrate. Daily feed reactors were used in the experiments. In the first setup, 750 g waste was initially added in a 5 L reactor and inoculum was added to make the effective volume of 2 L (single chamber reactor), and a double chamber reactor (two digesters of 1.5 L volume each, connected in series) was initially fed with 750 g wastes (350 g in each digester) and inoculum was added to make the effective volume of 1 L for each digester. The single chamber reactor was operated for 58 days whereas the double chamber reactor was run for only 23 days. Considering the hydraulic retention time as 40 days, from the 2nd day of operation, each reactor was fed daily with a mixture of 18.75 g wastes and required volume of tap water (natural groundwater) to make the total volume of 50 mL after dispensing equal volume of slurry from the reactor. The second set of experiment was similar to the double chamber reactor of the first setup, but it was operated for 58 days including the last 16 days operation at room temperature as the heater became out of order. In case of the first setup, the temperature varied from 31°C to 36°C and it did not affect the rate of biogas generation. The results of the experiments revealed that for the organic loading rate (OLR) of 1.30 g VS/L/d, the daily stable biogas generation rate was 0.23 m3/ kg of VS added for the single chamber reactor, and the daily average rate of biogas production for the later half of the operation period was 0.40 m3/kg of VS added for the double chamber reactor. During the second set of experiment (double chamber reactor), the temperature varied in between 32°C and 36°C when the room heater was on and it did not affect the rate of biogas generation, and the average rate of biogas generation was 0.29 m3/kg of VS added for the OLR of 1.30 gVS/L/d. The room temperature varied from 22°C to 25°C and the sudden drop of the temperature by about 10°C affected the rate of biogas production greatly. At the room temperature, the stable rate of biogas generation was only 0.08 m3/kg of VS added.
Keynote Forum
Doron Lavee
Tel Hai Academic College, Israel
Keynote: Solid waste recycling benchmarking
Time : 11:15-11:45
Biography:
Doron Lavee holds a PhD in Public Economics from the Ben-Gurion University; an MA in Economics and an MBA in Business Administration and Economics from the Hebrew University. He is a Member of the Department of Economics and Management at Tel-Hai Academic College. He also serves as a Partner and General Manager of Pareto Group Ltd. He is a well-known expert with over 22 years of experience in economic and environmental consulting, financial advisory and strategic consulting in various fields, including issues related to economic efficiency and the periphery. He has extensive experience in managing complex projects and large-scale environmental economic consulting and conducting projects for the public and government sectors, including government ministries, local authorities, government corporations and public agencies.
Abstract:
The research analyses the factors influencing the recycling potential of municipalities. Previous studies have shown that a waste management system that combines both landfill and recycling may be economically efficient, yet in practice many municipalities still do not operate significant recycling programs. The current paper identifies factors that predict where potential for economically efficient recycling is highest. It is shown that a small number of municipal characteristics, for which data is readily available, determine the recycling potential of the municipality. By applying our simple model to such data, it is possible to predict with close to 90% accuracy whether or not recycling will be economically efficient in any given municipality. Government ministries and agencies working to advance preferred waste management solutions have at their disposal only limited resources and budget, and so must concentrate their efforts where they will be most effective. The paper thus provides a powerful tool to help policy makers direct their efforts to encourage recycling at those municipalities where recycling is optimal, effectively replacing the need to carry out costly individual cost-benefit analyses.
- Circulatory Economy|E-Waste Recycling and Management|Waste Water Recycling|Industrial Waste Recycling|Agriculture Waste Recycling|Waste Management Techniques|Renewable Energy
Chair
E David
National Institute of Research and Development for Cryogenic and Isotopic Technologies, Romania
Co-Chair
Muscolo Adele
Università Mediterranea di Reggio Calabria, Italy