铁铝硅摩尔比对新型混凝剂除氟效果的影响
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摘要
研究了不同铁铝硅摩尔比条件下新型混凝剂对氟的去除效果,并考察熟化时间对混凝剂除氟性能的影响。结果表明,新型混凝剂在(Al+Fe)/Si(mol/mol)=5且Al/Fe(mol/mol)=1时除氟效果最好,60 min后氟离子(F~-)浓度降至5. 3 mg/L,除氟率达81. 1%。但是,聚硅酸中单独引入铁盐或铝盐时除氟效果较差。新型混凝剂放置15 d对除氟效果影响不大。该新型混凝剂在废水除氟方面具有应用潜力。
The fluoride removal by a new coagulant with different Fe/Al/Si molar ratios was investigated and the effect of aging time on fluoride removal was also studied. The results indicated that the highest efficiency of fluoride removal was obtained with( Al + Fe)/Si( mol/mol) of 5 and Al/Fe( mol/mol) of 1,and the concentration of fluorine ion( F~-) declined to 5. 3 mg/L after 60 min reaction,which achieved 81. 1% efficiency of F~- removal. However,an insufficient F-removal was obtained when either ferric salt or aluminum salt was added into polysilicate. The aging time of15 d had little influence on fluoride removal. The new coagulant had the potential of application.
The fluoride removal by a new coagulant with different Fe/Al/Si molar ratios was investigated and the effect of aging time on fluoride removal was also studied. The results indicated that the highest efficiency of fluoride removal was obtained with( Al + Fe)/Si( mol/mol) of 5 and Al/Fe( mol/mol) of 1,and the concentration of fluorine ion( F~-) declined to 5. 3 mg/L after 60 min reaction,which achieved 81. 1% efficiency of F~- removal. However,an insufficient F-removal was obtained when either ferric salt or aluminum salt was added into polysilicate. The aging time of15 d had little influence on fluoride removal. The new coagulant had the potential of application.
引文
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[2]付英,高宝玉.聚硅酸铁对溶解性有机物与浊度的去除[J].中国石油大学学报(自然科学版),2010,34(1):134-138.
[3]唐海,冯玲,颜酉斌,等.粉煤灰制备聚硅酸铁铝的结构特征与混凝机理[J].高校化学工程学报,2013,27(6):1045-1050.
[4]张锐,付颖寰,宋宇,等. PSAF-PDMDAAC复合絮凝剂的制备与性能[J].大连工业大学学报,2012,31(3):195-198.
[5]王爱民,白妮,王金玺,等.粉煤灰聚硅酸铝铁絮凝剂的制备及处理洗煤废水研究[J].离子交换与吸附,2017,33(4):350-360.
[6]樊忠昌.纳米型无机高分子絮凝剂的制备及性能研究[D].开封:河南大学,2007.
[7]郑丹阳,耿存珍.水体除氟方法的最新研究进展[J].环境科学与管理,2014,39(11):31-34.
[8]先元华.煤气化装置含氟废水处理工艺实验研究[J].水处理技术,2015,41(4):116-118.
[9] Sun T,Sun C H,Zhu G L,et al. Preparation and coagulation performance of poly-ferric-aluminum-silicate-sulfate from fly ash[J]. Desalination,2011,268(1):270-275.
[10] Moussas P A,Zouboulis A I. A study on the properties and coagulation behaviour of modified inorganic polymeric coagulant—Polyferric silicate sulphate(PFSi S)[J]. Sep Purif Technol,2008,63(2):475-483.
[11] Niu X X,Li X L,Zhao J H,et al. Preparation and coagulation efficiency of polyaluminium ferric silicate chloride composite coagulant from wastewater of high-purity graphite production[J]. J Environ Sci.,2011,23(7):1122-1128.
[12] Sun Y J,Zhu C Y,Zheng H L,et al. Characterization and coagulation behavior of polymeric aluminum ferric silicate for high-concentration oily wastewater treatment[J]. Chem Eng Res Des.,2017,119(3):23-32.
[13] Bi S,Wang C,Cao Q,et al. Studies on the mechanism of hydrolysis andpolymerisation of aluminium salts in aqueous solution:correlations between the core-links model and cage-like keggin-Al13 model[J]. Coord Chem Rev.,2004,248(5):441-455.
[14] Zouboulis A I,Moussas P A. Polyferric silicate sulphate(PFSi S):Preparation, characterisation and coagulation behavior[J].Desalination,2008,224(1):307-316.
[15] Wang D,Tang H. Modified inorganic polymerflocculant-PFSi:Its preparation,characterisation and coagulation behaviour[J]. Water Res,2001,35(14):3418-3428.
[16]杜鹃.纳米聚硅酸硫酸铝铁絮凝剂的制备及应用研究[D].西安:长安大学,2010.
[17]方月梅,张杰,罗承辉,等.含硅多核无机高分子絮凝剂的混凝机理研究[J].化学与生物工程,2008,25(6):29-32.
[18]郭雅妮,黄沛,念宁.聚硅酸铝锌絮凝剂的制备及影响因素研究[J].工业水处理,2013,33(6):65-69.
[19]王润楠,张浩,连丽丽,等.聚硅酸铝镁甲基纤维素钠复合絮凝剂的制备及应用[J].精细化工,2017,34(9):1044-1050.
[20]蔡忠.新型无机混凝剂聚硅酸铁铝的制备及其混凝机理研究[D].北京:北京化工大学,2007.
[21]郭雷,张略,高红莉,等.聚硅酸铝铁元素配比对饮料废水处理性能研究[J].环境科学与技术,2017,40(S1):211-214.
[22]宋敏娟,刘红,刘娟,等.聚合硅酸钛铝复合絮凝剂的结构及性能[J].环境工程学报,2012,6(8):2661-2665.
[23] Fan M,Brown R C,Leeuwen J V,et al. The kinetics of producing sulfate-based complex coagulant from fly ash[J]. Chem Eng Process,2003,42(12):1019-1025.
[24]郑定成,袁斌,蒋铭明,等.聚硅酸硫酸铝铁的制备和应用研究进展[J].无机盐工业,2011,43(2):4-6.