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Sci Total Environ

Title:		Enhanced thermal destruction of toxic microalgal biomass by using CO2
Author(s):		Jung JM; Lee J; Kim J; Kim KH; Kim HW; Jeon YJ; Kwon EE;
Address:		"Department of Environment and Energy, Sejong University, Seoul 05006, Republic of Korea. Department of Civil and Environmental Engineering, Hanyang University, Seoul 04763, Republic of Korea. Department of Biological Science and Technology, Sejong University, Seoul 05006, Republic of Korea. Department of Microbiology, Pukyong National University, Busan 48513, Republic of Korea. Electronic address: youngjaejeon@pknu.ac.kr. Department of Environment and Energy, Sejong University, Seoul 05006, Republic of Korea. Electronic address: ekwon74@sejong.ac.kr"
Journal Title:		Sci Total Environ
Year:		2016
Volume:		20160526
Issue:
Page Number:		575 - 583
DOI:		10.1016/j.scitotenv.2016.05.161
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"This work confirmed that dominant microalgal strain in the eutrophic site (the Han River in Korea) was Microcystis aeruginosa (M. aeruginosa) secreting toxins. Collected and dried microalgal biomass had an offensive odor due to microalgal lipid, of which the content reached up to 2+/-0.2wt.% of microalgal biomass (dry basis). This study has validated that the offensive odor is attributed to the C3-6 range of volatile fatty acids (VFAs), which was experimentally identified by the non-catalytic transformation of triglycerides (TGs) and free fatty acids (FFAs) in microalgal biomass into fatty acid methyl esters (FAMEs). In particular, this study mechanistically investigated the influence of CO2 in the thermal destruction (i.e., pyrolysis) of hazardous microalgal biomass in order to achieve dual purposes (i.e., thermal disposal of hazardous microalgal biomass and energy recovery). The influence of CO2 in pyrolysis of microalgal biomass was identified as 1) the enhanced thermal cracking behaviors of volatile organic compounds (VOCs) from the thermal degradation of microalgal biomass and 2) the direct gas phase reaction between CO2 and VOCs. These identified influences of CO2 in pyrolysis of microalgal biomass significantly enhanced the generation of CO: the enhanced generation of CO in the presence of CO2 was 590% at 660 degrees C, 1260% at 690 degrees C, and 3200% at 720 degrees C. In addition, two identified influences of CO2 (i.e., enhanced thermal cracking and direct gas phase reaction) occurred simultaneously and independently. The identified gas phase reaction in the presence of CO2 was only initiated at temperatures higher than 500 degrees C, which was different from the Boudouard reaction. Lastly, the experimental work justified that exploiting CO2 as a reaction medium and/or chemical feedstock will provide new technical approaches for controlling syngas ratio and in-situ air pollutant control without using catalysts"
Keywords:		*Biomass Carbon Dioxide/*chemistry Hazardous Waste/analysis *Incineration *Microalgae *Microcystis Co(2) Energy recovery Microalgae Microcystis aeruginosa (M.aeruginosa) Thermo-chemical treatment Waste disposal;
Notes:		"MedlineJung, Jong-Min Lee, Jechan Kim, Jieun Kim, Ki-Hyun Kim, Hyung-Wook Jeon, Young Jae Kwon, Eilhann E eng Netherlands 2016/05/30 Sci Total Environ. 2016 Oct 1; 566-567:575-583. doi: 10.1016/j.scitotenv.2016.05.161. Epub 2016 May 26"