Long-term effect of carbonation on heavy metals in fly ash of different alkalinity
SHE Kai-lang1,2, LI Ping3, LIU Jing-cai1, YAO Guang-yuan1, XU Ya1, XU Rong-bin1,4, ZHAO Yu-xin2, LIU Yu-qiang1
1. State Environmental Protection Key Laboratory of Hazardous Waste Identification and Risk Control, Chinese Research Academy of Environmental Sciences, Beijing 100020, China; 2. College of Municipal and Environmental Engineering, Jilin University of Construction, Changchun 130118, China; 3. Tianjin Yiming Environmental Technology Co. Ltd, Tianjing 300392, China; 4. College of Mines and Coal, Inner Mongolia University of Science and Technology, Baotou 014000, China
Abstract:Through carbonation treatment of domestic waste incineration fly ash in different areas, and the physical and chemical characteristics of fly ash are analyzed by XRF, SEM, and XRD, then the long-term impact of CO2 on the excessive heavy metals of Zn, Pb and Cd in different incineration fly ash is studied by pH measurement, heavy metal leaching experiment and heavy metal speciation analysis. The research shows that the incineration fly ash displayed different alkalinity characteristics due to the reduction of flue gas emission limits in the incineration process, which required a large amount of deacidification agent such as calcium hydroxide. According to the pH value of the leaching solution after the acetic acid buffer solution leaching experiment, the fly ash is divided into "acid ash" and "alkali ash", and the long-term carbonation experiments are carried out. The results showed that the leaching toxicity of heavy metals in "acid ash" was much higher than that of "alkali ash", but the leaching concentration of heavy metals Zn and Cd in "acid ash" after carbonation are reduced by 10%~18% and 9%~30% respectively. The leaching concentration of heavy metals Zn and Cd in "alkali ash" increased significantly, and the maximum leaching concentration exceeded 1.46 and 63.2 times of the standard for pollution control on the municipal solid waste incineration. The leaching of amphoteric heavy metal Pb in "acid ash" and "alkali ash" is not regular after carbonation, but in general, carbonation has a greater effect on heavy metal Pb in "alkali ash". Finally, the change law of heavy metals in fly ash before and after carbonation is analyzed by BCR sequntial extraction procedure. The BCR results show that the leaching concentration of heavy metals Zn and Cd in "acid ash" shows a downward trend affected by the increase of the proportion of T4after carbonation, but the proportion of T1in some samples increases, which indicated that such heavy metals still have leaching risk. However, the leaching concentration of heavy metals Zn and Cd in "alkali ash" shows an increasing trend affected by the increase of the proportion of T1after carbonation. Therefore, we should focus on the leaching characteristics of heavy metals in fly ash with different alkalinity before landfill disposal, and provide guarantee for long-term stable landfill of fly ash.
折开浪, 李萍, 刘景财, 姚光远, 徐亚, 徐荣斌, 赵玉鑫, 刘玉强. 碳酸化对不同碱度飞灰中重金属的长期影响[J]. 中国环境科学, 2022, 42(8): 3832-3840.
SHE Kai-lang, LI Ping, LIU Jing-cai, YAO Guang-yuan, XU Ya, XU Rong-bin, ZHAO Yu-xin, LIU Yu-qiang. Long-term effect of carbonation on heavy metals in fly ash of different alkalinity. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(8): 3832-3840.
中华人民共和国国家统计局.中国统计年鉴[M]. 北京:中国统计出版社, 2020. National Bureau of statistics of the People's Republic of China.China statistical yearbook[R]. Beijing:China Statistics Press, 2020.
[2]
Nie Y F. Development and prospects of municipal solid waste (MSW) incineration in China[J]. Frontiers of Environmental Science & Engineering in China, 2008,2(1):1-7.
[3]
魏云梅,姚瑞轩,陈爽,等.生活垃圾焚烧飞灰加速碳酸化深度除氯与水洗除氯对比研究[J]. 中国环境科学, 2021,41(9):4184-4192. Wei Y M, Yao R X, Chen S, et al. Removal of chloride from MSWI fly ash:a comparison of accelerated carbonation and water flushing[J]. China Environmental Science, 2021,41(9):4184-4192.
[4]
GB 16889-2008生活垃圾填埋场污染控制标准[S]. GB16889-2008 Standard for pollution control on the landfill site of municipal solid waste[S].
[5]
GB 18485-2014生活垃圾焚烧污染控制标准[S]. GB18485-2014 Standard for pollution control on the municipal solid waste incineration[S].
[6]
Li W H, Sun Y J, Xin M X, et al. Municipal solid waste incineration fly ash exposed to carbonation and acid rain corrosion scenarios:Release behavior, environmental risk, and dissolution mechanism of toxic metals[J]. Science of the Total Environment, 2020,744:140857.
[7]
Ecke H, Menad N, Lagerkvist A. Carbonation of municipal solid waste incineration fly ash and the impact on metal mobility[J]. Journal of Environmental Engineering, 2003,129(5):435-440.
[8]
Ecke H, Menad N, Lagerkvist A. Treatment-oriented characterization of dry scrubber residue from municipal solid waste incineration[J]. Journal of Material Cycles and Waste Management, 2002,4(2):117-126.
[9]
Gerven T V, Keer E V, Arickx S. Carbonation of MSWI-bottom ash to decrease heavy metal leaching, in view of recycling[J]. Waste Management, 2005,25(3):291-300.
[10]
胡雨燕,陈德珍,袁园,等.CO2对飞灰稳定化效果的影响[J]. 能源环境保护, 2004,(3):14-17,20. Hu Y Y, Chen D Z, Yuan Y, et al. Effect of CO2 on the stabilization of fly ashes[J]. Energy Environmental Protection, 2004,(3):14-17,20.
[11]
Wang L, Jin Y Y, Nie Y F. 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.
[12]
倪鹏,张军营,赵永椿,等.城市固体废弃物焚烧飞灰碳酸化的实验研究[J]. 工程热物理学报, 2015,36(3):686-689. Ni P, Zhang J Y, Zhao Y C, et al. Experimental research of carbonation of municipal solid waste incineration fly ash[J]. Journal of Engineering Thermophysics, 2015,36(3):686-689.
[13]
童立志,韦黎华,王峰,等.焚烧飞灰重金属含量及浸出长期变化规律研究[J]. 中国环境科学, 2020,40(5):2132-2139. Tong L Z, Wei L H, Wang F, et al. Study on the long-term changes of heavy metal content and leaching behavior of municipal solid waste incineration fly ash[J]. China Environmental Science, 2020,40(5):2132-2139.
[14]
GB/T 15555.12-1995固体废物腐蚀性测定玻璃电极法[S]. GB/T 15555.12-1995 Solid waste-Glass electrode test-Method of corrosivity[S].
GB/T 50082-2009普通混凝土长期性能和耐久性能试验方法标准[S]. GB/T 50082-2009 Standard for test methods of long-term performance and durability of ordinary concrete[S].
[17]
Wang J M, Jiang J G, Li D, et al. Removal of Pb and Zn from contaminated soil by different washing methods:the influence of reagents and ultrasound[J]. Environmental Science & Pollution Research, 2015,22(24):20084-20091.
[18]
M.B. álvare, Garrido M, Lista A G, et al. Three-way multivariate analysis of metal fractionation results from sediment samples obtained by different sequential extraction procedures and ICP-OES[J]. Analytica Chimica Acta, 2008,620(1/2):34-43.
[19]
武博然,王冬扬,柴晓利.生活垃圾焚烧飞灰生物脱氯机制研究[J]. 中国环境科学, 2015,35(8):2470-2476. Wu B R, Wang D Y, Chai X L. Dechlorination mechanism of municipal solid wastes incineration fly ash by biological process[J]. China Environmental Science, 2015,35(8):2470-2476.
[20]
熊金磊.我国城市生活垃圾焚烧飞灰中高氯含量特性及其影响[J]. 中国资源综合利用, 2019,37(6):117-119. Xiong J L. The characteristics and effects of high chlorine incineration fly ash of municipal solid waste in China[J]. China Resources Comprehensive Utilization, 2019,37(6):117-119.
[21]
Ahmaruzzaman M. A review on the utilization of fly ash[J]. Progress in Energy & Combustion Science, 2010,36(3):327-363.
[22]
章骅,于思源,邵立明,等.烟气净化工艺和焚烧炉类型对生活垃圾焚烧飞灰性质的影响[J]. 环境科学, 2018,39(1):467-476. Zhang H, Yu S Y, Shao L M, et al. Influence of air pollution control (APC) systems and furnace type on the characteristics of APC residues from municipal solid waste incinerators[J]. Environmental Science, 2018,39(1):467-476.
[23]
王成艳.加速碳酸化对焚烧飞灰重金属浸出特性及高温迁移特性的影响[D]. 沈阳:沈阳航空工业学院, 2010. Wang C Y. Influence of accelerated carbonation on heavy metal's leaching characteristics and transfer characteristics in thermal treatment in MSWI fly ash[D]. Shenyang:Shenyang University of Technology, 2010.
[24]
王雷,金宜英,聂永丰.生活垃圾焚烧飞灰的加速碳酸化处理[J]. 中国环境科学, 2009,29(10):1111-1116. Wang L, Jin Y Y, Nie Y F. Accelerated carbonation of municipal solid waste incineration fly ash[J]. China Environmental Science, 2009,29(10):1111-1116.
[25]
Pan S Y, Chang E E, Chiang P C. CO2 capture by accelerated carbonation of alkaline wastes:a review on its principles and applications[J]. Aerosol and Air Quality Research, 2016,12(5):770-791.
[26]
倪鹏.垃圾焚烧飞灰矿化解毒一体化的研究[D]. 武汉:华中科技大学, 2018. Ni P. Study on the integration of municipal solid waste incineration fly ash carbonation and stabilization of heavy metals[D]. Wuhan:Huazhong University of Science and Technology, 2018.
[27]
郑旭帆,杜艺,苗恩东,等.城市固体废弃物焚烧飞灰碳酸化研究进展[J]. 洁净煤技术, 2022,28(1):187-197. Zhen X F, Du Y, Miao E D, et al. Research progress on carbonation of municipal solid waste incineration fly ash[J]. Clean Coal Technology, 2022,28(1):187-197.
[28]
章骅,何品晶,李忻洁,等.模型化研究pH对垃圾焚烧飞灰金属浸出的影响机制[J]. 环境科学, 2008,29(1):268-272. Zhang H, He P J, Li X J, et al. Modeling research on impact of pH on metals leaching behavior of air pollution control residues from MSW incinerator[J]. Environmental Science, 2008,29(1):268-272.
[29]
Zhang Y, Cetin B, Likos W J, et al. Impacts of pH on leaching potential of elements from MSW incineration fly ash[J]. Fuel, 2016, 184:815-825.
[30]
Leng L, Leng S, Chen J,et al.The migration and transformation behavior of heavy metals during co-liquefaction of municipal sewage sludge and lignocellulosic biomass[J]. Bioresource Technology, 2018, 259:156-163.
[31]
Wang F H, Zhang F, Chen Y J, et al. A comparative study on the heavy metal solidification/stabilization performance of four chemical solidifying agents in municipal solid waste incineration fly ash[J]. Journal of Hazardous Materials, 2015,300:451-458.
[32]
童立志.焚烧飞灰螯合效果评价方法优化及新型高分子螯合剂合成[D]. 哈尔滨:哈尔滨工业大学. Tong L Z. Optimization of the chelation efficiency evaluation method and advanced synthesis of novel macromolecule chelating agents for incineration fly ash treatment[D]. Harbin:Harbin Institute of Technology.