粉煤灰旋流吸附印染废水中有机物的试验研究
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摘要
旋流器作为一种典型的化工机械中的分离设备,其研究开发受到国内外的广泛关注。采用旋流器改进单元操作过程是当前研究热点。
本文以粉煤灰为吸附剂,采用旋流分离器作为吸附-分离器,吸附亚甲基蓝和甲基橙的水溶液模拟的印染废水。通过正交试验法及单因素试验确定旋流吸附过程中吸附剂粒径、吸附剂浓度、有机物浓度和进口流量对有机物吸附效率和分离效率的影响,结果表明：吸附剂粒径和进口流量对分离效率影响显著,吸附剂粒径和吸附剂浓度对吸附效率影响显著。在最佳旋流吸附条件即吸附剂粒径为350-400目,吸附剂浓度为900mg/L,有机物浓度为70mg/L,进口流量0.88m3/h时,对亚甲基蓝的吸附效率为60.57%,对甲基橙的吸附效率为71.48%。此外,拟合出旋流吸附过程中粉煤灰吸附有机物的吸附等温线方程及吸附动力学方程。对旋流器内流场进行模拟,获得了旋流器内部的压力场、切向速度、轴向速度分布等。
As a typical equipment for separation, hydrocyclone has been widely studied all over the world. The implementation of it into the unit process is also a hot issue currently.
Printing and dyeing wastewater, represented by the water solution with methylene blue and methyl orange, is treated using fly ash as the adsorbent and hydrocyclone as the separation device in this study. An orthogonal test and a single factor experiment were designed to determine the influence of the particle size of fly ash, concentration of fly ash, organic concentration and inlet flow on the organic adsorption efficiency and separation efficiency. The results show that the particle size of fly ash and inlet flow rate have more influence on the separation efficiency, while particle size of fly ash and concentration of fly ash influence more on the adsorption efficiency. In the best working condition for adsorption (particle size of fly ash is 350-400 mesh, concentration is 900 mg/L, organic concentration is 70 mg/L, and inlet flow rate is 0.88 m3/h), adsorption efficiency of methylene blue and methyl orange is 60.57%and 71.48% separately. The isotherms and kinetic models for adsorption process inside a hydrocyclone were also obtained.
Moreover, Computational Fluid Dynanics (CFD) method was adopted to investigate the distributions of pressure and velocities inside a hydrocyclone.
本文以粉煤灰为吸附剂,采用旋流分离器作为吸附-分离器,吸附亚甲基蓝和甲基橙的水溶液模拟的印染废水。通过正交试验法及单因素试验确定旋流吸附过程中吸附剂粒径、吸附剂浓度、有机物浓度和进口流量对有机物吸附效率和分离效率的影响,结果表明：吸附剂粒径和进口流量对分离效率影响显著,吸附剂粒径和吸附剂浓度对吸附效率影响显著。在最佳旋流吸附条件即吸附剂粒径为350-400目,吸附剂浓度为900mg/L,有机物浓度为70mg/L,进口流量0.88m3/h时,对亚甲基蓝的吸附效率为60.57%,对甲基橙的吸附效率为71.48%。此外,拟合出旋流吸附过程中粉煤灰吸附有机物的吸附等温线方程及吸附动力学方程。对旋流器内流场进行模拟,获得了旋流器内部的压力场、切向速度、轴向速度分布等。
As a typical equipment for separation, hydrocyclone has been widely studied all over the world. The implementation of it into the unit process is also a hot issue currently.
Printing and dyeing wastewater, represented by the water solution with methylene blue and methyl orange, is treated using fly ash as the adsorbent and hydrocyclone as the separation device in this study. An orthogonal test and a single factor experiment were designed to determine the influence of the particle size of fly ash, concentration of fly ash, organic concentration and inlet flow on the organic adsorption efficiency and separation efficiency. The results show that the particle size of fly ash and inlet flow rate have more influence on the separation efficiency, while particle size of fly ash and concentration of fly ash influence more on the adsorption efficiency. In the best working condition for adsorption (particle size of fly ash is 350-400 mesh, concentration is 900 mg/L, organic concentration is 70 mg/L, and inlet flow rate is 0.88 m3/h), adsorption efficiency of methylene blue and methyl orange is 60.57%and 71.48% separately. The isotherms and kinetic models for adsorption process inside a hydrocyclone were also obtained.
Moreover, Computational Fluid Dynanics (CFD) method was adopted to investigate the distributions of pressure and velocities inside a hydrocyclone.
引文
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[5]Aksu Z. Biosorption of reactive dyes by dried activated sludge:equilibrium and kinetic modeling. Biochemical Engineering Journal,2001,7(1):79-84
[6]Robinson T, Chandran P, Nigam P. Removal of dyes from a synthetic textile dye effluent by biosorption on apple pomace and wheat straw. Water Research,2002,36(11): 2824-2830
[7]S Xu, J Wang, R Wu, et al. Adsorption behaviors of acid and basic dyes on crosslinked amphoteric starch. Chem.Eng.J,2006,117:161-167
[8]Gong R, Chen J, et al. Removal of basic dyes from aqueous solution by sorption on phosphoric acid modified rice straw. Dyes and Pigments,2007,73(3):332-337
[9]G Annadurai, R S Juang, D J Lee. Use of cellulose-based wasters for adsorption of dyes from aqueous solutions. J.Hazard.Mater,2002, B92:263-274
[10]K Mohanty, J T Naidu, B C Meikap, et al. Removal of crystal violet from wastewater by activated carbons prepared from rice husk. Ind. Chem.Res,2006,45(14):5165-5171
[11]Leechart P, Nakbanpotc W, Thiravetyan P. Application of waste wood shaving bottom ash for adsorption of azo reactive dye. Journal of Environmental Management,2009, 90(2):912-920
[12]王福元,吴正严.粉煤灰利用手册.北京：中国电力出版社,1997,46
[13]李亚峰,孙风海,牛晚扬,等.粉煤灰处理废水的机理及应用.矿业安全与环保,2001,28(2)：30-32
[14]N Sarier. Specific features of adsorption of azo dyes on fly ash. Springer New York, 2007,56(3):1066-5285
[15]侯立安.特殊废水处理技术及工程实例.化学工业出版社,2003
[16]刘转年,赵西成.不同组成粉煤灰吸附亚甲基蓝的性能和机理研究.西安建筑科技大学学报(自然科学版),2007,39(6)：867-872
[17]郑越,刘方,吴永贵.粉煤灰对工业废水中氨氮的吸附性能研究.环境科学与技术,2011,34(1)：4-7
[18]窦磊,荆肇乾,王斌,等.粉煤灰基质滤料对水中亚甲基蓝的吸附研究.化工技术与开发,2009,38(10)：45-48
[19]刘军奇,王本红,吕海亮,等.粉煤灰沸石对甲基橙的吸附研究.山东科技大学学报(自然科学版),2010,29(6)：89-93
[20]Papandreou A., Stournaras C J., Panias D. Copper and cadmium adsorption on pellets made from fired coal fly ash. Journal of Hazardous Materials,2007,148:538-547
[21]张建平,张振生,尹连庆,等.粉煤灰处理废水机理及应用.粉煤灰综合利用,1996(4)：33-35
[22]M. Otero, F Rozada, L F Calvo, et al. Kinetic and equilibrium modeling of the methylene blue removal from solution by adsorbent materials produced from sewage sludges. Biochemical Engineering Journal,2003,15:59-68
[23]Yasemin Bulut, Haluk Aydin. A kinetics and thermodynamics study of methylene blue adsorption on wheat shells. Desalination,2006,194:259-267
[24]李飞,薛红琴,缪军,等.粉煤灰对含铬废水的吸附研究.环境科学与管理,2011,36(1)：54-58
[25]Seiichi Kondo, Tatsuo Lshikawa, Lkuo Abe. Adsorption Science. Beijing:Chemical Industry Press,2006
[26]刘转年.王念秦.超细粉煤灰吸附亚甲基蓝的机理研究.离子交换与吸附,2008,24(6)：535-543
[27]Pengthamkcerati P, Satapanaja T, Singchan O. Sorption of reactive dye from aqueous solution on biomass fly ash. Journal of Hazardous Materials,2008,153(3):1149-1156
[28]Paul Jano, Hana Buchtova, Milena Ryznarova. Sorption of dyes from aqueous solutions onto fly ash. Water Research,2003,53(2):655-665
[29]Paul Vander Meeren, Willy Verstraete. Removal of PCBs from wasterwater using fly ash. Chemosphere,2003,37:4938-4944
[30]刘转年,何婵,赵西成.超细粉煤灰对甲基橙的吸附性能和机理研究.环境科学,2009,32(2)
[31]I J Alinnor. Adsorption of heavy metal ions from aqueous solution by fly ash. Fuel, 2007,86:853-857
[32]王华,宋存义,张强.粉煤灰改性吸附材料及其吸附机理.粉煤灰综合利用,2000,14(4)：37-41
[33]Fanor Mondragon, Fabio Rincon, Ligia Sierra. New Perspectives for Coal Ash Utilization:Syntheisis of Zeolitc Materials. Fuel, Vo.69,263-266,1999
[34]隋智慧.粉煤灰基混凝剂处理印染废水.印染,2004,30(20)：11-13
[35]薛方亮,高彦林,张雁秋.改性粉煤灰降解亚甲基蓝溶液的实验研究.环境科学与管理,2006,31(2),50-53
[36]王红蕾,刘璐.粉煤灰多孔陶瓷的制备及其对亚甲基蓝吸附性能.河北科技师范学院学报,2009,23(2)：39-42
[37]Wang X, Wu H. Environmental-bengin utilization of fly ash as low-cost adsorbents. Journal of Hazardous Materials,2006,136(3):482-501
[38]Yolanda F, Roberto F, Alberto A G, et al. Heterogeneous catalysis in the Fenton-type system reactive black 5/H2O2. Journal of Molecular Catalysis A:Chemical,2008, 281(1/2):184-191
[39]何婵.粉煤灰超细改性及吸附性能研究[硕士学位论文].西安：西安科技大学,2008
[40]C Sierra, J R Gallego, E Afif, et al. Analysis of soil washing effectiveness to remediate a brown field polluted with pyrite ashes. Journal of Hazardous Materials,2010,180: 602-608
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