免烧结微生物垃圾焚烧飞灰砖的抗压强度研究

摘要/Abstract

摘要： 针对当前城市垃圾焚烧飞灰(MSWI)处置费用高昂、环境污染严重等问题,提出一种利用微生物矿化原理制备免烧结垃圾焚烧飞灰砖的方法。通过在飞灰砖固结体中加入微生物菌液,利用微生物诱导碳酸盐沉积原理,实现飞灰中重金属的固化和稳定化。本文以垃圾焚烧飞灰、Ca(OH)₂、砂子、微生物菌液为原材料,通过单因素试验,探究了制备微生物飞灰砖最优的飞灰掺量、菌液浓度、营养液中钙离子浓度。试验结果表明,当飞灰掺量为40%(质量分数),菌液OD₆₀₀值为0.60,营养液中钙离子浓度为0.30 mol/L时,飞灰砖力学性能最优。此时规格为100 mm×100 mm×50 mm免烧结微生物飞灰砖的干密度为1 937.40 kg/m³,抗压强度达到33.90 MPa,并且重金属浸出浓度满足限值要求,实现垃圾焚烧飞灰的资源化利用。

关键词: 垃圾焚烧飞灰, 微生物, 免烧结砖, 抗压强度, 重金属浸出浓度

Abstract: In view of the high cost and serious environmental pollution caused by the disposal of municipal solid waste incineration (MSWI) fly ash, a method for preparing unburned microbial MSWI fly ash brick, using the principle of microbial mineralization, is proposed. The solidification and stabilization of heavy metals in MSWI fly ash were achieved by adding microbial bacteria liquid to the MSWI fly ash brick consolidation body and using the principle of microbial induced carbonate deposition. In this paper, MSWI fly ash, Ca(OH)₂, sand and microbial bacteria were used as raw materials, and the optimal MSWI fly ash content, microbial bacterial solution concentration and calcium ion concentration in nutrient solution for the preparation of microbial MSWI fly ash brick were explored through single factor experiment. The test results show that when the MSWI fly ash content is 40% (mass fraction), the OD₆₀₀ value of the microbial bacterial solution is 0.60, and the Ca²⁺ concentration in the nutrient solution is 0.30 mol/L, the mechanical properties of the MSWI fly ash brick are the best. At this time, the dry density of the 100 mm×100 mm×50 mm unburned microbial MSWI fly ash brick is 1 937.40 kg/m³, the compressive strength reaches 33.90 MPa, and the heavy metal leaching concentration meets the limit requirement, realizing the resource utilization of MSWI fly ash.

Key words: MSWI fly ash, microorganism, unburned brick, compressive strength, heavy metal leaching concentration

中图分类号:

X705

谢伸皓, 贾冠华, 崔娟玲, 李珠. 免烧结微生物垃圾焚烧飞灰砖的抗压强度研究[J]. 硅酸盐通报, 2022, 41(2): 740-746.

XIE Shenhao, JIA Guanhua, CUI Juanling, LI Zhu. Compressive Strength of Unburned Microbial Municipal Solid Waste Incineration Fly Ash Brick[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(2): 740-746.

参考文献

[1] FAN C C, WANG B M, QI Y, et al. Characteristics and leaching behavior of MSWI fly ash in novel solidification/stabilization binders[J]. Waste Management, 2021, 131: 277-285.
[2] 钱觉时,曲艳召,范云燕,等.高硫废渣特性及其在水泥中应用展望[J].硅酸盐通报,2012,31(5):1175-1180.
QIAN J S, QU Y Z, FAN Y Y, et al. Characteristics of sulfate-rich residues and its application prospect in cement[J]. Bulletin of the Chinese Ceramic Society, 2012, 31(5): 1175-1180 (in Chinese).
[3] QUINA M J, BONTEMPI E, BOGUSH A, et al. Technologies for the management of MSW incineration ashes from gas cleaning: new perspectives on recovery of secondary raw materials and circular economy[J]. Science of the Total Environment, 2018, 635: 526-542.
[4] LI J T, ZENG M, JI W X. Characteristics of the cement-solidified municipal solid waste incineration fly ash[J]. Environmental Science and Pollution Research, 2018, 25(36): 36736-36744.
[5] TANG Q, LIU Y, GU F, et al. Solidification/stabilization of fly ash from a municipal solid waste incineration facility using Portland cement[J]. Advances in Materials Science and Engineering, 2016, 2016: 1-10.
[6] LUAN J D, CHAI M Y, LI R D, et al. The mineral phase evolution behaviour in the production of glass-ceramics from municipal solid waste incineration fly ash by melting technology[J]. Environmental Technology, 2016, 37(8): 1036-1044.
[7] XUE Y, LIU X M. Detoxification, solidification and recycling of municipal solid waste incineration fly ash: a review[J]. Chemical Engineering Journal, 2021, 420: 130349.
[8] 钱春香,王安辉,王欣.微生物灌浆加固土体研究进展[J].岩土力学,2015,36(6):1537-1548.
QIAN C X, WANG A H, WANG X. Advances of soil improvement with bio-grouting[J]. Rock and Soil Mechanics, 2015, 36(6): 1537-1548 (in Chinese).
[9] 徐晶,王彬彬.陶粒负载微生物的混凝土开裂自修复研究[J].材料导报,2017,31(14):127-131.
XU J, WANG B B. Research on self-healing of concrete cracks by ceramsite immobilized microorganism[J]. Materials Review, 2017, 31(14): 127-131 (in Chinese).
[10] WANG J Y, VANDEVYVERE B, VANHESSCHE S, et al. Microbial carbonate precipitation for the improvement of quality of recycled aggregates[J]. Journal of Cleaner Production, 2017, 156: 355-366.
[11] WILLIAMS S L, KIRISITS M J, FERRON R D. Optimization of growth medium for Sporosarcina pasteurii in bio-based cement pastes to mitigate delay in hydration kinetics[J]. Journal of Industrial Microbiology & Biotechnology, 2016, 43(4): 567-575.
[12] 李珠,冯涛,周梦君,等.基于科式芽孢杆菌矿化沉积的混凝土裂缝自修复性能试验研究[J].混凝土,2017(6):5-8.
LI Z, FENG T, ZHOU M J, et al. Experimental study on self-healing performance of concrete cracks based on mineralization of Bacillus cohnii[J]. Concrete, 2017(6): 5-8 (in Chinese).
[13] ZHANG J G, LIU Y Z, FENG T, et al. Immobilizing bacteria in expanded perlite for the crack self-healing in concrete[J]. Construction and Building Materials, 2017, 148: 610-617.
[14] KHADIM H J, AMMAR S H, EBRAHIM S E. Biomineralization based remediation of cadmium and nickel contaminated wastewater by ureolytic bacteria isolated from barn horses soil[J]. Environmental Technology & Innovation, 2019, 14: 100315.
[15] KANG C H, HAN S H, SHIN Y, et al. Bioremediation of Cd by microbially induced calcite precipitation[J]. Applied Biochemistry and Biotechnology, 2014, 172(6): 2907-2915.
[16] 钱春香,王明明,许燕波.土壤重金属污染现状及微生物修复技术研究进展[J].东南大学学报(自然科学版),2013,43(3):669-674.
QIAN C X, WANG M M, XU Y B. Current situation of soil contamination by heavy metals and research progress in bio-remediation technique[J]. Journal of Southeast University (Natural Science Edition), 2013, 43(3): 669-674 (in Chinese).
[17] 成亮,钱春香,王瑞兴,等.碳酸盐矿化菌株A固结土壤Cd²⁺的生物矿化过程[J].硅酸盐学报,2008,36(s1):215-221.
CHENG L, QIAN C X, WANG R X, et al. Bioremediation process of Cd²⁺ removal from soil by bacteria A biomineralization[J]. Journal of the Chinese Ceramic Society, 2008, 36(s1): 215-221 (in Chinese).
[18] CHEN P, ZHENG H, XU H, et al. Microbial induced solidification and stabilization of municipal solid waste incineration fly ash with high alkalinity and heavy metal toxicity[J]. PLoS One, 2019, 14(10): e0223900.
[19] 颜可珍,郑凯高,胡迎斌.城市生活垃圾焚烧飞灰在沥青胶浆中的应用[J].铁道科学与工程学报,2018,15(10):2509-2517.
YAN K Z, ZHENG K G, HU Y B. Application of municipal solid waste incinerator ash in asphalt mortar[J]. Journal of Railway Science and Engineering, 2018, 15(10): 2509-2517 (in Chinese).
[20] 金漫彤,董海丽,楼敏晓,等.土壤聚合物固化飞灰与水泥固化的比较研究[J].硅酸盐通报,2008,27(5):904-908.
JIN M T, DONG H L, LOU M X, et al. Research into the comparison between geopolymer solidification fly ash and cement solidification fly ash[J]. Bulletin of the Chinese Ceramic Society, 2008, 27(5): 904-908 (in Chinese).
[21] CHEN Z L, LU S Y, TANG M H, et al. Mechanical activation of fly ash from MSWI for utilization in cementitious materials[J]. Waste Management, 2019, 88: 182-190.
[22] XU P, ZHAO Q L, QIU W, et al. Microstructure and strength of alkali-activated bricks containing municipal solid waste incineration (MSWI) fly ash developed as construction materials[J]. Sustainability, 2019, 11(5): 1283.
[23] 耿永娟,李绍纯,李秋义,等.利用固体废弃物制备硫铝酸盐水泥的研究进展[J].硅酸盐通报,2013,32(11):2268-2273.
GENG Y J, LI S C, LI Q Y, et al. Research progress of the sulphoaluminate cement prepared with solid wastes as raw materials[J]. Bulletin of the Chinese Ceramic Society, 2013, 32(11): 2268-2273 (in Chinese).
[24] 高炎旭.微生物诱导碳酸盐沉淀(MICP)团聚化垃圾焚烧飞灰试验研究[D].杭州:浙江理工大学,2017.
GAO Y X. Experimental study on aggregation of municipal solid waste incineration fly ash based on microbial induced carbonate precipitation[D]. Hangzhou: Zhejiang Sci-Tech University, 2017 (in Chinese).
[25] 荣辉,魏冠奇,张磊,等.微生物胶凝材料固结垃圾焚烧飞灰效果及机制[J].材料导报,2019,33(22):3757-3761+3767.
RONG H, WEI G Q, ZHANG L, et al. Consolidation of municipal solid waste incineration fly ash by microbial cementing material: effect and mechanism[J]. Materials Reports, 2019, 33(22): 3757-3761+3767 (in Chinese).
[26] 郝小虎,张家广,李珠,等.钙离子对微生物矿化改性再生骨料性能的影响研究[J].新型建筑材料,2019,46(9):84-87.
HAO X H, ZHANG J G, LI Z, et al. Study on the effect of calcium ion on the performance of microbial mineralized modified recycled aggregate[J]. New Building Materials, 2019, 46(9): 84-87 (in Chinese).