盐酸改性粉煤灰净化低温低浊水的试验研究
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摘要
由于粉煤灰具有良好的吸附性能且富含硅、铝和铁等元素,将其作为助凝剂,用盐酸对粉煤灰改性后与聚合硫酸铁PFS联合使用处理低温低浊水。在用盐酸对粉煤灰进行改性时,研究了振荡时间、振荡速度、盐酸浓度等试验因素对改性粉煤灰吸附助凝效果的影响,得出盐酸改性粉煤灰的最佳试验条件为:振荡器振荡速度80r/min,100 mL 3.6 mol/L盐酸与5g预处理粉煤灰混合振荡3h,试验温度25℃。改性后粉煤灰的比表面积明显增加,并且粉煤灰中部分硅、铝和铁等元素溶出,转变成具有很好絮凝作用的Al3+、Fe3+和H2SiO3,粘附于粉煤灰表面,在处理低温低浊水的过程中能较好地发挥吸附助凝效果。
Becaouse of the excellent adsorption performance and high containing of silicon,aluminum and iron and other elements,fly ash by hydrochloric acid modified was used as a coagulant to purify low temperature and low turbidity water with reagent PFS.When the fly ash were modified by hydrochloric acid,the experimental factors just as duration of oscillation,speed of oscillation and hydrochloric acid concentration were researched.The best experimental conditions of hydrochloric acid modification were follows: the speed of oscillation 80 r/min,100 mL 3.6 mol/L of hydrochloric acid and 5 g the coal fly ash mixed in the oscillator for about 3 h,the experiment temperature 25 ℃.The specific surface of modified fly ash increased significantly,the elements such as silicon,aluminum and iron dissolved from fly ash and they turned into Al3+,Fe3+ and H2SiO3(adhesion on the surface of fly ash) whose flocculation were strong.In the process of purifying low temperature and low turbidity water by hydrochloric acid modified fly ash,the adsorptive property can be exerted effectively.
Becaouse of the excellent adsorption performance and high containing of silicon,aluminum and iron and other elements,fly ash by hydrochloric acid modified was used as a coagulant to purify low temperature and low turbidity water with reagent PFS.When the fly ash were modified by hydrochloric acid,the experimental factors just as duration of oscillation,speed of oscillation and hydrochloric acid concentration were researched.The best experimental conditions of hydrochloric acid modification were follows: the speed of oscillation 80 r/min,100 mL 3.6 mol/L of hydrochloric acid and 5 g the coal fly ash mixed in the oscillator for about 3 h,the experiment temperature 25 ℃.The specific surface of modified fly ash increased significantly,the elements such as silicon,aluminum and iron dissolved from fly ash and they turned into Al3+,Fe3+ and H2SiO3(adhesion on the surface of fly ash) whose flocculation were strong.In the process of purifying low temperature and low turbidity water by hydrochloric acid modified fly ash,the adsorptive property can be exerted effectively.
引文
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[3]白芸,胡良,陈雷.涡旋混凝低脉动沉淀技术处理低温低浊水[J].北华大学学报:自然科学版,2007,8(6):573-575.
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[5]郭玲,陈玉成.低温低浊水处理技术的研究应用[J].微量元素与健康研究,2006,23(4):57-59.
[6]包晨雷,杨琳,杨忠宇.微絮凝直接过滤处理低温低浊水的研究和探讨[J].中国科技信息,2010(14):31-32.
[7]李诚,孙世群.不同预氧化工艺强化处理低温低浊水对比试验研究[J].供水技术,2007,1(3):11-13.
[8]张绍梅,周北海,刘苗,等.臭氧/生物活性炭深度处理密云水库水中试研究[J].中国给水排水,2007,23(21):81-84.
[2]Zouboulis A,Traskas G,Samaras P.Comparison of Efficiency betweenPoly-aluminium Chloride and Aluminium Sulphate Coagulants duringFull-scale Experiments in a Drinking Water Treatment Plant[J].Separa-tion Science and Technology,2008,43(6):1507-1519.
[3]白芸,胡良,陈雷.涡旋混凝低脉动沉淀技术处理低温低浊水[J].北华大学学报:自然科学版,2007,8(6):573-575.
[4]王桂荣,张杰.强化混凝处理低温低浊水的研究[J].工业用水与废水,2004,35(5):20-22.
[5]郭玲,陈玉成.低温低浊水处理技术的研究应用[J].微量元素与健康研究,2006,23(4):57-59.
[6]包晨雷,杨琳,杨忠宇.微絮凝直接过滤处理低温低浊水的研究和探讨[J].中国科技信息,2010(14):31-32.
[7]李诚,孙世群.不同预氧化工艺强化处理低温低浊水对比试验研究[J].供水技术,2007,1(3):11-13.
[8]张绍梅,周北海,刘苗,等.臭氧/生物活性炭深度处理密云水库水中试研究[J].中国给水排水,2007,23(21):81-84.