Characteristics of Electrostatic Precipitator Ash and Bag Filter Ash From a Circulating Fluidized Bed Municipal Solid Waste Incinerator
(2.Hangzhou Xiaoshan Urban Green Energy Co., LTD., Hangzhou, Zhejiang Province, China 311225)
【Abstract】Electrostatic precipitator (ESP) ash and bag filter (BF) ash from a circulating fluidized bed (CFB) municipal solid waste (MSW) incineration power plant in Zhejiang Province were sampled as the research objects. Particle size distribution, surface characteristics, mineral composition, heavy-metal content, and leaching characteristics of ESP ash and BF ash were systematically studied. Results show that1) the particle size distribution of ESP ash and BF ash displayed unimodal distribution, which were mainly distributed in the ranges of 9.8–120.6 μm and 3.8–78.8 μm respectively; 2) the fly ash particles had negligible porosity and the adsorption of heavy metals mainly took place on the exposed surfaces of ESP ash and BF ash; 3) the main mineral composition of ESP ash was SiO2, whereas BF ash primarily consisted of SiO2, Ca(OH)2, CaCO3, NaCl, and KCl; 4) Cd and Hg were transferred into fly ash by evaporation, condensation and adsorption, whereas Se was transferred into fly ash by chemical adsorption; As and Cr were transferred into the fly ash mainly by entrainment, whereas Pb, Cu, and Zn were transferred into the fly ash mainly in the form of chlorides by evaporation, condensation and adsorption; 5) Cd, Cu and Zn in fly ash showed high leachability, while the leaching rates of Cr Hg and Se were relatively low.
【Keywords】 municipal solid waste (MSW) ; circulating fluidized bed (CFB) ; incineration; electrostatic precipitator (ESP) ash; bag filter (BF) ash; fly-ash characteristics; heavy metals;
 Lü Wei, Li Ruiyang, Qi Chong. The present situation and development tendency of MSW incinerated in China [J]. Energy Conservation Technology, 2003, 21 (1): 39–41 (in Chinese).
 Zhang Qian, Xu Haiyun. Status and development suggestion of incineration technology of domestic garbages [J]. Environmental Engineering, 2012, 30 (2): 79–81 (in Chinese).
 National Bureau of Statistics of China. National data [DB/OL]. http://data.stats.gov.cn/easyquery.htm?cn=C01, 2016 (in Chinese).
 Ye Xiuya, Zhou Shaoqi, Xu Bin, et al. Comparative study on metal speciation distributions in MSWI fly ash with various particle sizes [J]. Chinese Journal of Environmental Engineering, 2012, 6 (11): 4235–4239 (in Chinese).
 Wang Lei, Jin Yiying, Nie Yongfeng. Investigation of accelerated and natural carbonation of MSWI fly ash with a high content of Ca [J]. Journal of Hazardous Materials, 2010, 174 (1–3): 334–343.
 Jin Xiaofeng, Wang Enlu, Wang Changpu. The analysis of performances of all the de-dust techonlogies and the application prospeerity of the bag filter in the coal fired utility boilers [J]. Boiler Technology, 2007, 38 (1): 8–12 (in Chinese).
 Zheng Chenghang, Wang Li, Zhang Yongxin, et al. Partitioning of hazardous trace elements among air pollution control devices in ultra-low-emission coal-fired power plants [J]. Energy & Fuels, 2017, 31 (6): 6334–6344.
 Deng Shuang, Shi Yingjie, Liu Yu, et al. Emission characteristics of Cd, Pb and Mn from coal combustion: Field study at coal-fired power plants in China [J]. Fuel Processing Technology, 2014, 126: 469–475.
 Lu Shengyong, Chi Yong, Yan Jianhua, et al. Transfer and distribution mechanisms of heavy metal pollutants in the process of MSW incineration [J]. Thermal Power Generation, 2003, 32 (3): 24–28 (in Chinese).
 Zhao Lingkui, Li Caiting, Zhang Xunan, et al. A review on oxidation of elemental mercury from coal-fired flue gas with selective catalytic reduction catalysts [J]. Catalysis Science & Technology, 2015, 5 (7): 3459–3472.
 Gao Yanshan, Zhang Zhang, Wu Jingwen, et al. A critical review on the heterogeneous catalytic oxidation of elemental mercury in flue gases [J]. Environmental Science & Technology, 2013, 47 (19): 10813–10823.
 Luan Jingde, Li Rundong, Zhang Zhihui, et al. Speciation evolutions of target metals (Cd, Pb) influenced by chlorine and sulfur during sewage sludge incineration [J]. Frontiers of Environmental Science&Engineering, 2014, 8 (6): 871–876.
 Li Jianxin, Yan Jianhua, Chi Yong. The partitioning of heavy metals during MSW incineration on fluidized bed furnace [J]. Proceedings of the CSEE, 2005, 25 (17): 100–104 (in Chinese).
 Belevi H, Moench H. Factors determining the element behavior in municipal solid waste incinerators. 1. Field studies [J]. Environmental Science & Technology, 2000, 34 (12): 2501–2506.
 Yu Jie, Sun Lushi, Xiang Jun, et al. Physical and chemical characterization of ashes from a municipal solid waste incinerator in China [J]. Waste Management&Research, 2013, 31 (7): 663–673.
 Yan Jianhua, Peng Wen, Li Xiaodong, et al. Leaching behavior of heavy metals from MSWI fly ash [J]. Journal of Fuel Chemitry and Technology, 2004, 32 (1): 65–68 (in Chinese).
 McMurdie H F, Morris M C, Evans E H, et al. Standard X-ray diffraction powder patterns from the JCPDS research associateship [J]. Powder Diffraction, 1986, 1 (4): 334–345.
 Pontes F V M, de O Mendes B A, de Souza E M F, et al. Determination of metals in coal fly ashes using ultrasound-assisted digestion followed by inductively coupled plasma optical emission spectrometry [J]. Analytica Chimica Acta, 2010, 659 (1–2): 55–59.
 United State Environmental Protection Agency. Method 1311-Toxicity Charcteristics Leaching Procedure (TCLP) [Z]. Test Methods for Evaluating Solid Wastes: Physical/Chemical Methods, SW-846. Washington DC: US EPA, 1990.
 Gilardoni S, Fermo P, Cariati F, et al. MSWI fly ash particle analysis by scanning electron microscopy-energy dispersive X-ray spectroscopy [J]. Environmental Science & Technology, 2004, 38 (24): 6669.
 Chang M B, Chung Y T. Dioxin contents in fly ashes of MSW incineration in Taiwan [J]. Chemosphere, 1998, 36 (9): 1959–1968.
 Haul R. Adsorption, surface area and porosity [J]. Zeitschrift für Physikalische Chemie, 1969, 63 (1–4): 220–221.
 Zhang Hua, He Pinjing, Shao Liming. Fate of heavy metals during municipal solid waste incineration in Shanghai [J]. Journal of Hazardous Materials, 2008, 156 (1–3): 365–373.
 López-Antón M A, Díaz-Somoano M, Spears D A, et al. Arsenic and selenium capture by fly ashes at low temperature [J]. Environmental Science & Technology, 2006, 40 (12): 3947–3951.
 Fernandez M A, Martinez L, Segarra M, et al. Behavior of heavy metals in the combustion gases of urban waste incinerators [J]. Environmental Science & Technology, 1992, 26 (5): 1040–1047.
 Verhulst D, Buekens A, Spencer P J, et al. Thermodynamic behavior of metal chlorides and sulfates under the conditions of incineration furnaces [J]. Environmental Science & Technology, 1995, 30 (1): 50–56.