题目：Conversion of Biomass and Waste Materials into Biofuel, Bioenergy and Valuable Resources
报告人：Prof. Chi-Hwa Wang
Dr. Chi-Hwa Wang is currently a Professor of Chemical and Biomolecular
Engineering at the National University of Singapore (NUS). He had the following joint appointments in his service to the same university (i) Assistant Dean for Research at the Faculty of Engineering, NUS (2006-2008), and (ii) Faculty Fellow, Singapore-MIT Alliance (2001-2006). He received his M.S. degree (Biomedical Engineering) from Johns Hopkins University, M.A. and PhD degrees (both in Chemical Engineering) from Princeton University, respectively. He was holding several visiting appointments throughout different stages of his career: Kyoto University (2003, JSPS Visiting Fellow), Cambridge University (2004, Sabbatical Academic Visitor), Massachusetts Institute of Technology (2004, Visiting Associate Professor). His current research interests include particle technology, biomass gasification, and waste to energy and resource. He is on the editorial boards of Journal of Controlled Release (2009 - present), Powder Technology (2008 - present), Advanced Powder Technology (2009 – present, also Executive Editor, 2009-2012), and Applied Energy (2017- present). He is currently an Executive Editor for Chemical Engineering Science (Elsevier, 2013 - present). Chi-Hwa is the recipient of a few recent awards such as AIChE Shining Star Award 2016, Teaching Commendation List, Faculty of Engineering, National University of Singapore, 2017. WSSET (World Society of Sustainable Energy Technologies) Award 2017, Bologna, Italy, 2017, and AIChE Shell Thomas Baron Award, Pittsburgh, USA, 2018.
Waste-to-Energy: Gasification is a favorable thermal-based process for recovering energy from biomass and solid wastes, which could eliminate pathogens and produce bioenergy in the form of synthesis gas under high temperatures (>700°C) with small amount of oxygen to avoid complete combustion. Our recent research has showed that gasification process is capable of treating and recovering energy from a diverse source of biomass and solid wastes, e.g. wood and horticultural waste, sewage sludge, food waste and animal manures. For instance, (i) chicken manure was successfully gasified in a downdraft fixed-bed gasifier producing syngas with a higher heating value of 4.9 MJ/(N.m3), (ii) redwood waste which can produce syngas with a higher heating value of 4.7 MJ/(N.m3), and (iii) sewage sludge which was successfully co-gasified with 80 wt.% woodchips producing syngas with a higher heating value of 4.5 MJ/(N.m3). However, gasification is not capable of treating watery wastes, such as food wastes. Therefore, we have integrated our gasification system with anaerobic digestion (AD) which can handle watery waste. First, energy in the form of bio-methane was harvested from food wastes via the AD process, and then the remaining solid (sludge) from AD process was gasified to produce additional energy in the form of syngas. This integration can significantly enhance the efficiency of recovering energy from food wastes. On the other hand, chemical process such as transesterification was used to recover energy in the form of biodiesel from waste oils. For example, transesterification of waste cooking oil with alcohol was carried out over the CaO catalyst developed from chicken manure waste and up to 90% of biodiesel (or FAME) was obtained.
Waste-to-Resource: our research also focuses on the conversion of solid and hazardous wastes into valuable resources. The reutilization of those wastes not only produces valuable products, but also offers a cost effective and environmental friendly way of recycling those wastes. For example: (i) wood ash – solid by-product from gasification of woody biomass – was successfully converted into the active “CaO catalyst” and effectively used as a heterogeneous catalyst for biodiesel production; (ii) biochar – another solid by-product from gasification process – was converted into “activated carbon” with the maximum adsorption capability of 189.8 mg sample/g dye and it can be effectively used as an adsorbent material for wastewater treatment; and (iii) coal fly ash and carbon soot were successfully converted into “zeolite” and “adsorbent material”, respectively.
并获工学博士学位，而后入职新加坡国立大学环境研究所任研究员并参与新加坡NRF CREATE E2S2项目，从事废物能源化与资源化相关研究，开发了多项废物处理技术和资源化系统。他曾作为新加坡E2S2 Systems公司CTO，其主要为超大城市废弃物管理与资源化及可持续发展提供整体解决方案和系统。张博士目前的研究主要致力于固体废弃物处理技术、废物资源化利用和系统集成、厌氧废水处理以及环境生物处理技术等。作为项目负责人和主要成员参与了多项国内和国际合作项目，并发表高水平SCI论文30+篇。