酸改性粉煤灰的制备及其降解选矿废水COD研究
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摘要
由于粉煤灰中含有大量的无定形相玻璃体,因此可用于选矿废水COD的降解。粉煤灰改性试验结果表明在酸改性法、碱改性法和盐改性法中,酸改性粉煤灰法效果最好。酸改性法的较佳工艺参数为:硫酸浓度1.0 mol/L、液固比3:1、酸化温度50℃、酸化时间90 min。在优化工艺下制备酸改性粉煤灰,用其降解选矿废水COD,试验条件为酸改性粉煤灰20 g/L、Fe2+1.5 mmol/L、H2O2 9.5 mmol/L、反应40 min,COD去除率可达90%以上,降解后废水符合排放标准。
Because fly ash contains a large number of amorphous phase vitreous, so can be used COD degradation in mineral processing wastewater. The modified test results show that among acid modified method, alkali modification method and salt modification method of fly ash, the acid modified method of fly ash is best. The optimum parameters of acid modified method are as follows: H2 SO4 1.0 mol/L, liquid-solid ratio 3:1, acidification temperature 50 ℃ and acidification time 90 min. Acid modified fly ash was prepared under the optimized process, it is used to degrade the beneficiation wastewater COD, the test conditions for degradation of mineral processing wastewater COD are as follows: modified fly ash 20 g/L, Fe2+ 1.5 mmol/L,H2 O2 9.5 mmol/L, reaction time 40 min, experiments show that the removal rate of COD can reach more than90%; the wastewater after degradation conforms to the national environmental protection emission standard.
Because fly ash contains a large number of amorphous phase vitreous, so can be used COD degradation in mineral processing wastewater. The modified test results show that among acid modified method, alkali modification method and salt modification method of fly ash, the acid modified method of fly ash is best. The optimum parameters of acid modified method are as follows: H2 SO4 1.0 mol/L, liquid-solid ratio 3:1, acidification temperature 50 ℃ and acidification time 90 min. Acid modified fly ash was prepared under the optimized process, it is used to degrade the beneficiation wastewater COD, the test conditions for degradation of mineral processing wastewater COD are as follows: modified fly ash 20 g/L, Fe2+ 1.5 mmol/L,H2 O2 9.5 mmol/L, reaction time 40 min, experiments show that the removal rate of COD can reach more than90%; the wastewater after degradation conforms to the national environmental protection emission standard.
引文
[1]夏畅斌,何湘柱,李德良.酸改性粉煤灰处理焦化废水的工艺研究[J].环境工程,2000,18(6):28-29.
[2]Gong Z.The treatment effect of acid-modified fly ash on reactive dye wastewater[J].Textile Dyeing&Finishing Journal,2017,39(03):58-61.
[3]杨林锋,翟建平,郑波,等.酸改性粉煤灰去除污水中磷的试验研究[J].粉煤灰综合利用,2006(3):18-20.
[4]Liu W H,Zhang L,Zheng X J,et al.Experimental study of acid-modified fly ash treatment for dye-printing wastewater[J].Chemical Engineering,2010,38(10):120-119.
[5]刘文辉,张梁,郑先俊,等.酸改性粉煤灰对印染废水处理的试验研究[C]//全国化工化学工程设计技术中心站2010年年会.2010.
[6]刘文辉,张梁,郑先俊,等.酸改性粉煤灰对印染废水处理的试验研究[J].化学工程,2010,38(10):120-122.
[7]Li F,Wu W,Li R,et al.Adsorption of phosphate by acidmodified fly ash and palygorskite in aqueous solution:Experimental and modeling[J].Applied Clay Science,2016,132-133:343-352.
[8]黄晓丽,马红竹,胡萌晓,等.正交设计在酸改性粉煤灰处理甲基橙染料废水中的应用[J].硅酸盐通报,2014,33(11):2918-2923.
[9]Gredler G.Experimental Study on the Removal of Phosphate from Wastewater with Acid-modified Fly Ash[J].Psychology in the Schools,2006,42(2):221-223.
[10]Hui-Yuan L I.Study on the Application of Sulfuric Acid Modified Fly Ash in Sludge Dewatering[J].Journal of Anhui Agricultural Sciences,2012,40(05):2955-2956,2959.
[2]Gong Z.The treatment effect of acid-modified fly ash on reactive dye wastewater[J].Textile Dyeing&Finishing Journal,2017,39(03):58-61.
[3]杨林锋,翟建平,郑波,等.酸改性粉煤灰去除污水中磷的试验研究[J].粉煤灰综合利用,2006(3):18-20.
[4]Liu W H,Zhang L,Zheng X J,et al.Experimental study of acid-modified fly ash treatment for dye-printing wastewater[J].Chemical Engineering,2010,38(10):120-119.
[5]刘文辉,张梁,郑先俊,等.酸改性粉煤灰对印染废水处理的试验研究[C]//全国化工化学工程设计技术中心站2010年年会.2010.
[6]刘文辉,张梁,郑先俊,等.酸改性粉煤灰对印染废水处理的试验研究[J].化学工程,2010,38(10):120-122.
[7]Li F,Wu W,Li R,et al.Adsorption of phosphate by acidmodified fly ash and palygorskite in aqueous solution:Experimental and modeling[J].Applied Clay Science,2016,132-133:343-352.
[8]黄晓丽,马红竹,胡萌晓,等.正交设计在酸改性粉煤灰处理甲基橙染料废水中的应用[J].硅酸盐通报,2014,33(11):2918-2923.
[9]Gredler G.Experimental Study on the Removal of Phosphate from Wastewater with Acid-modified Fly Ash[J].Psychology in the Schools,2006,42(2):221-223.
[10]Hui-Yuan L I.Study on the Application of Sulfuric Acid Modified Fly Ash in Sludge Dewatering[J].Journal of Anhui Agricultural Sciences,2012,40(05):2955-2956,2959.