Permeability of Polyacrylamide Modified Soil-Bentonite and Its Adsorption of Phenol

Abstract

Abstract: In order to improve the permeability of the soil-bentonite (SB) isolation barrier and its adsorption effect on phenol, a polyacrylamide modified soil-bentonite (PSB) was prepared. The effects of polyacrylamide content, phenol concentration, dry-wet cycles and freeze-thaw cycles on the permeability coefficient of PSB isolation barrier and the adsorption effect on phenol were studied, and the mechanism of these effects were revealed at micro level. The results show that phenol concentration has no effect on permeability coefficient of PSB isolation barrier. The permeability coefficient of PSB isolation barrier increases under dry-wet cycles but remains the same order of magnitude. The permeability coefficient of PSB isolation barrier increases by 1~2 orders under freeze-thaw cycles. Polyacrylamide reduces the permeability coefficient of PSB isolation barrier under dry-wet cycles and freeze-thaw cycles, indicating that it can effectively restrain the destructive effects of dry-wet cycles and freez-thaw cycles. The adsorption rate of phenol on the PSB isolation barrier with 0.7% (mass fraction) polyacrylamide reaches over 69%, which is about 50% higher than that on the SB barrier, and gradually increases with the increase of concentration of phenol contaminated solution. The research can provide theoretical basis and parameter support for isolation and closure of phenol pollution.

Key words: soil-bentonite, polyacrylamide, permeability coefficient, adsorption rate, pore structure, dry-wet cycle, freez-thaw cycle

CLC Number:

SONG Xiangyang, LIU Lin, ZHANG Yongpeng. Permeability of Polyacrylamide Modified Soil-Bentonite and Its Adsorption of Phenol[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(6): 2201-2208.

References

[1] 李耀武,李凯.当前零排放技术在煤化工污水处理中的应用[J].化工管理,2020(3):41-42.
LI Y W, LI K. Application of current zero discharge technology in coal chemical sewage treatment[J]. Chemical Enterprise Management, 2020(3): 41-42 (in Chinese).
[2] 陈云敏,谢海建,柯瀚,等.挥发性有机化合物在复合衬里中的一维扩散解[J].岩土工程学报,2006,28(9):1076-1080.
CHEN Y M, XIE H J, KE H, et al. Analytical solution of one-dimensional diffusion of volatile organic compounds (VOCs) through composite liners[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(9): 1076-1080 (in Chinese).
[3] 杨赞中,廖立兵,杜洪兵,等.非金属矿物在环境治理中的应用[J].矿物岩石地球化学通报,1999,18(4):257-260.
YANG Z Z, LIAO L B, DU H B, et al. Application of non metallic minerals to the pollution control[J]. Bulletin of Mineralogy Petrology and Geochemistry, 1999, 18(4): 257-260 (in Chinese).
[4] 李梦耀,刘建.膨润土的改性研究及其应用[J].长安大学学报(地球科学版),2003,25(2):76-78.
LI M Y, LIU J. The study on the bentonite's modifying and it's application[J]. Journal of Xi'an Engineering University, 2003, 25(2): 76-78 (in Chinese).
[5] 李芳蓉.膨润土的改性及其在废水处理中的应用研究[D].兰州:西北师范大学,2007.
LI F R. Studies on modifying and application of bentonite in wastewater treatment[D]. Lanzhou: Northwest Normal University, 2007 (in Chinese).
[6] ZHANG T W, DENG Y F, LAN H X, et al. Experimental investigation of the compactability and cracking behavior of polyacrylamide-treated saline soil in Gansu Province, China[J]. Polymers, 2019, 11(1): 90.
[7] 张学佳,纪巍,康志军,等.聚丙烯酰胺的特性及应用[J].化学工业与工程技术,2008,29(5):45-49.
ZHANG X J, JI W, KANG Z J, et al. Characteristics and application of polyacrylamide[J]. Journal of Chemical Industry & Engineering, 2008, 29(5): 45-49 (in Chinese).
[8] 刘学贵,刘长风,高品一,等.聚丙烯酰胺改性膨润土防渗材料的制备及其表征[J].新型建筑材料,2012,39(4):10-13.
LIU X G, LIU C F, GAO P Y, et al. Preparation and characterization of polyacrylamide modificated bentonite as impermeability material[J]. New Building Materials, 2012, 39(4): 10-13 (in Chinese).
[9] 王桂芳,李恒军,陈程,等.利用不同性能钙基膨润土制备膨润土复合材料的试验研究[J].化工矿物与加工,2018,47(12):22-25.
WANG G F, LI H J, CHEN C, et al. Experimental research on preparation of bentonite composite by using Ca-bentonite with different properties[J]. Industrial Minerals & Processing, 2018, 47(12): 22-25 (in Chinese).
[10] 孙志勇,王智懿,张娇.阳离子聚丙烯酰胺复配钠基膨润土处理模拟苯酚废水[J].化工环保,2016,36(2):179-182.
SUN Z Y, WANG Z Y, ZHANG J. Treatment of simulated phenol wastewater by cationic polyacrylamide compounded sodium bentonite[J]. Environmental Protection of Chemical Industry, 2016, 36(2): 179-182 (in Chinese).
[11] 钟如怀,李振宇.有机改性膨润土对镉离子及苯酚的吸附性能研究[J].中国石油和化工标准与质量,2019,39(3):59-60.
ZHONG R H, LI Z Y. Study on the adsorption performance of organic modified bentonite for cadmium ion and phenol [J]. China Petroleum and Chemical Standard and Quality, 2019, 39(3): 59-60 (in Chinese).
[12] US Environmental Protection Agency. Prohibition on the placement of bulk liquid hazardous waste in landfills-statutory interpretive guidance, 530-SW-86-016[R]. Washington D C: US Environmental Protection Agency, 1986.
[13] American Society for Testing and Materials. Standard test method for wetting and drying test of solid wastes:ASTM D4843—88[S]. Philadephta: ASTM Press,1988.
[14] American Society for Testing and Materials. Standard test methods for freezing and thawing compacted soil-cement mixtures ASTM D560—03[S]. West Conshohocken: ASTM International, 2003.
[15] 董金梅,徐洪钟,朱定华,等.不同水环境下高分子材料改性粉土的试验研究[J].岩土工程学报,2013,35(7):1316-1322.
DONG J M, XU H Z, ZHU D H, et al. Experimental study on silty soil modified by polymer materials under varying water environments[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(7): 1316-1322 (in Chinese).
[16] 吕帅,彭伟军,苗毅恒,等.聚丙烯酰胺类絮凝剂在矿业领域的研究进展[J].矿产保护与利用,2021,41(1):79-84.
LV S, PENG W J, MIAO Y H, et al. Advances of polyacrylamide flocculants in mining industry[J]. Conservation and Utilization of Mineral Resources, 2021, 41(1): 79-84 (in Chinese).
[17] 陈彬,王宝,许健,等.冻融-干湿循环作用下土工合成黏土衬垫防渗性能变化规律[J].新型建筑材料,2019,46(1):128-133.
CHEN B, WANG B, XU J, et al. Change law of hydraulic performance of geosynthetic clay liners under freeze-thaw and wet-dry cycling[J]. New Building Materials, 2019, 46(1): 128-133 (in Chinese).
[18] 查甫生,刘晶晶,许龙,等.水泥固化重金属污染土干湿循环特性试验研究[J].岩土工程学报,2013,35(7):1246-1252.
ZHA F S, LIU J J, XU L, et al. Cyclic wetting and drying tests on heavy metal contaminated soils solidified/stabilized by cement[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(7): 1246-1252 (in Chinese).
[19] 张玉佩.聚丙烯酰胺水泥土力学性能及耐久性能试验研究[D].呼和浩特:内蒙古农业大学,2013.
ZHANG Y P. Study on polyacrylamide soil cement mechanical properties and durability[D]. Hohhot: Inner Mongolia Agricultural University, 2013 (in Chinese).
[20] YANG Z P, LI D H, LIU S L, et al. A study on the strength properties of solidified lead contaminated soil under repeated freeze and thaw cycles[C]//IACGE 2018. Chongqing, China. Reston, VA: American Society of Civil Engineers, 2019: 270-284.
[21] 陶高梁,吴小康,杨秀华,等.水泥土的孔隙分布及其对渗透性的影响[J].工程地质学报,2018,26(5):1243-1249.
TAO G L, WU X K, YANG X H, et al. Pore distribution of cement-soil and its effect on permeability[J]. Journal of Engineering Geology, 2018, 26(5): 1243-1249 (in Chinese).