污泥与秸秆共热解制备生物炭工艺优化及其对Cr(VI)的吸附
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摘要
在不同热解温度、热解时间及配比下,利用生活污泥与小麦秸秆共热解制备污泥基生物炭(WB),研究了不同条件对WB吸附性能的影响,并以吸附性能为评价指标,应用响应面分析法优化了WB的最佳工艺条件,并研究了最佳WB对水溶液中Cr(VI)的吸附规律。结果表明:1)热解温度、热解时间和配比对WB吸附能力均有显著影响;2)制备WB的最佳热解温度、热解时间、配比分别为503.19℃、120 min、m(麦秆)∶m(污泥)=1.2;3)Langmuir模型和Freundlich模型都能很好地表征WB对Cr(VI)的吸附特征,二级动力学模型可以更好地解释WB对Cr(VI)的吸附机制。
Sludge-based biochars(WB) were prepared by co-pyrolysis of sludges and wheat straws under different pyrolysis temperatures, times and ratios, and the effect of different pyrolysis conditions on the adsorption properties of WB was studied, besides, optimum process for the preparation of WB was optimized by the response surface analysis method, and the adsorption law of optimum WB on Cr(VI) in aqueous solution was investigated. The results showed that: 1) pyrolysis temperature, pyrolysis time and ratio had significant influence on the adsorption capacity of WB; 2) the optimum pyrolysis conditions for preparing WB were 503.19 ℃, 120 min, and 1.2(m(straw)∶m(sludge), dry weight); 3) both the Langmuir and the Freundlich models could well characterize the adsorption characteristics of WB on Cr(VI), and the second kinetics model could explain the adsorption of Cr(VI) better.
Sludge-based biochars(WB) were prepared by co-pyrolysis of sludges and wheat straws under different pyrolysis temperatures, times and ratios, and the effect of different pyrolysis conditions on the adsorption properties of WB was studied, besides, optimum process for the preparation of WB was optimized by the response surface analysis method, and the adsorption law of optimum WB on Cr(VI) in aqueous solution was investigated. The results showed that: 1) pyrolysis temperature, pyrolysis time and ratio had significant influence on the adsorption capacity of WB; 2) the optimum pyrolysis conditions for preparing WB were 503.19 ℃, 120 min, and 1.2(m(straw)∶m(sludge), dry weight); 3) both the Langmuir and the Freundlich models could well characterize the adsorption characteristics of WB on Cr(VI), and the second kinetics model could explain the adsorption of Cr(VI) better.
引文
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[2] 易龙生,康路良,王三海,等. 市政污泥资源化利用的新进展及前景 [J]. 环境工程, 2014,32(增刊1): 992-997.
[3] 邓辉,李政家, 金志文,等. 棉秆与污泥共热解制备生物炭工艺优化及其结构与吸附性能 [J]. 农业工程学报, 2016(24): 248-254.
[4] 吴春山, 黄富文, 刘文伟, 等. 污泥基生物炭对垃圾渗滤液的吸附性能研究 [J]. 环境工程, 2017, 35(2): 1-4.
[5] Fan S, Tang J, Wang Y, et al. Biochar prepared from co-pyrolysis of municipal sewage sludge and tea waste for the adsorption of methylene blue from aqueous solutions: kinetics, isotherm, thermodynamic and mechanism [J]. Journal of Molecular Liquids, 2016, 220(4):32-41.
[6] Zeng F, Liao X, Hu H, et al. Effect of KOH activation in the desulfurization process of activated carbon prepared by sewage sludge & corn straw [J]. Journal of the Air & Waste Management Association, 2017,68(12):255-264.
[7] Zhang S, Wang W, Zhou J. Preparation of adsorbent by co-pyrolysis of sewage sludge and cornstalk and its performance form ercury removal of flue gas [J]. Journal of China University of Mining & Technology, 2015, 44(5): 901-905.
[8] Wang H, Feng M, Zhou F, et al. Effects of atmospheric ageing under different temperatures on surface properties of sludge-derived biochar and metal/metalloid stabilization [J]. Chemosphere, 2017, 184(1):76-84.
[9] 吴炽珊,张杏锋,高波,等. 李氏禾生物炭对重金属污染尾矿砂中铅、锌和砷形态转化的影响 [J]. 环境工程,2018,36(1):183-7,33.
[10] 张向前, 侯国军,张玉虎,等. 不同产地水稻秸秆制备生物炭结构特征及其理化性质 [J]. 环境工程,2017,35(9):122-126.
[11] Lin Y, Liao Y, Yu Z, et al. A study on co-pyrolysis of bagasse and sewage sludge using TG-FTIR and Py-GC/MS [J]. Energy Conversion and Management, 2017, 151(1):90-98.
[12] Ruiz-Gomez N, Quispe V, Abrego J, et al. Co-pyrolysis of sewage sludge and manure [J]. Waste Manag, 2017, 59(2):11-21.
[13] Jin J, Li Y, Zhang J, et al. Influence of pyrolysis temperature on properties and environmental safety of heavy metals in biochars derived from municipal sewage sludge [J]. J Hazard Mater, 2016, 320(4):17-26.
[14] Zhang Q R, Zhang S Q, Pan T T. Fraction distribution changes of heavy metals in co-pyrolysis of sewage sludge and corn straw [J].Advanced Materials Research, 2011, 236:187-191.
[15] 潘亭亭, 张双全,张秋荣,等. 城市污泥与玉米秸秆共热解重金属的形态变化 [J]. 中国矿业大学学报,2011,40(3): 487-491.
[16] 杨凯,丁志江,肖立春,等. 城市污泥耦合锯末共热解特性及动力学分析 [J]. 热能动力工程,2018,33(3): 112-118.
[17] 王忠科,李刚, 庄昌建, 等. 污泥-花生壳共热解气相产物研究 [J]. 可再生能源,2017,35(5):660-667.
[18] Jin J, Wang M, Cao Y, et al. Cumulative effects of bamboo sawdust addition on pyrolysis of sewage sludge: biochar properties and environmental risk from metals [J]. Bioresour Technol, 2017, 228(2):18-26.
[19] 王国才,殷志源. 污泥与麦秸共热解制备吸附剂的研究 [J]. 河南化工,2011(13): 48-50.
[20] 任晓莉, 朱开金. 化学干法热解制备污泥吸附剂及其工艺优化 [J]. 化工进展, 2013(12): 2997-3001,30-31.
[21] Rio S, Le Coq L, Faur C, et al. Preparation of adsorbents from sewage sludge by steam activation for industrial emission treatment [J]. Process Safety and Environmental Protection, 2006, 84(4): 258-264.
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