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以粉煤灰为材料,研究改性粉煤灰吸附处理实验室模拟含铬废水的影响因素.结果表明:改性粉煤灰处理含六价铬废水最佳运行条件是:pH值8,吸附时间20min,原水水温,改性粉煤灰投加量为0.5g/100ml,六价铬去除率高达99.41%. 相似文献
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正交方法研究改性粉煤灰吸附处理含铬废水 总被引:1,自引:0,他引:1
5采用高分子絮凝剂聚二甲基二烯丙基氯化铵(PDMDAAC)对粉煤灰进行改性,通过正交试验研究改性粉煤灰处理模拟含铬废水。实验结果表明:废水pH=12,改性粉煤灰用量为1g;吸附平衡时间60min;反应温度为40℃,去除率可达97.8%。改性粉煤灰对Cr^+6的吸附符合Langmuir模型。该方法具有处理效果好,操作简单,运行费用低等优点。 相似文献
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以氧化钙为改性材料对粉煤灰进行火法改性,并将其应用到含磷废水的处理中,研究了改性粉煤灰在不同的改性条件对含磷废水的处理效果。结果表明,粉煤灰与氧化钙质量比为1∶1,焙烧温度为950℃,焙烧时间为4 h时所得的改性粉煤灰对含磷废水有较好的处理效果,磷去除率可达92%。改性前后粉煤灰的SEM结果表明,改性后的粉煤灰颗粒变得粗糙多孔,具有较大的比表面积,因此具有较好的吸附性。 相似文献
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以小麦秸秆和电厂粉煤灰为原料,辅以外加药剂(水泥、石灰、石膏及水玻璃),经混合、成球、陈化和养护工序,制得小麦秸秆-粉煤灰纤维陶粒(以下简称纤维陶粒).以比表面积(SSA)为主要考察指标,通过单因素实验和正交实验,考察了秸秆用量、秸秆粒径及外加药剂对秸秆-粉煤灰纤维陶粒性能的影响.结果表明,外加药剂对秸秆-粉煤灰纤维陶粒SSA的影响主次顺序为:石灰>水玻璃>水泥>石膏;最佳制备方案为:选用经2次粉碎后的小麦秸秆,秸秆的用量为10%,即秸秆与粉煤灰的质量配比为1∶9,外加药剂:石灰8%,水玻璃2%,水泥3%及石膏2.5%,在优组合下制得的纤维陶粒的SSA为7.925m2/g. 相似文献
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粉煤灰基混凝剂的制备及在大麻废水中的应用 总被引:6,自引:0,他引:6
采用酸溶法以粉煤灰为基础原料 ,通过添加一定量的硫铁矿烧渣 ,制备成粉煤灰基复合混凝剂 ,确定了最佳工艺条件 .实验结果表明 ,影响混凝剂制备的主要因素是粉煤灰与硫铁矿渣的质量比、酸用量、浸取时间和温度 .此混凝剂对大麻废水中 CODcr去除率达 88% ,色度去除率可达 96.6%以上 ,具有沉淀快和污泥体积小等优点 . 相似文献
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粉煤灰在废水废气处理中的应用 总被引:3,自引:0,他引:3
对粉煤灰在废水处理和废气净化方面的应用做了介绍。粉煤灰具有良好的吸附性能,可以用来去除废水中的COD、BOD、色度、磷、磷酸酶和铬等重金属离子,可以加工成优良的混凝剂,还可以制成脱硫剂脱除烟气中的二氧化硫,处理效果良好。 相似文献
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Ashwani Kumar Sahu Vimal Chandra Srivastava 《Chemical Engineering Communications》2013,200(3):316-335
The present study deals with the sorptive removal of furfural from aqueous solution by carbon-rich bagasse fly ash (BFA). Batch studies were performed to evaluate the influence of various experimental parameters, namely, initial pH (p H 0), adsorbent dose, contact time, initial concentration, and temperature on the removal of furfural. Optimum conditions for furfural removal were found to be p H 0 ≈ 5.5, adsorbent dose ≈4 g/L of solution, and equilibrium time ≈4 h. The adsorption followed pseudo-second-order kinetics. The effective diffusion coefficient of furfural is of the order of 10?13 m2/s. Equilibrium adsorption data on BFA was analyzed by Freundlich, Langmuir, Dubnin-Radushkevich, Redlich-Peterson, and Temkin isotherm equations using regression and error analysis. The Redlich-Peterson isotherm was found to best represent the data for furfural adsorption onto BFA. Adsorption of furfural on BFA is favorably influenced by a decrease in the temperature of the operation. Values of the change in entropy (ΔS 0) and heat of adsorption (ΔH 0) for furfural adsorption on BFA were negative. The high negative value of change in Gibbs free energy (ΔG 0) indicates the feasible and spontaneous adsorption of furfural on BFA. 相似文献
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Ashwani Kumar Sahu Indra Deo Mall Vimal Chandra Srivastava 《Chemical Engineering Communications》2008,195(3):316-335
The present study deals with the sorptive removal of furfural from aqueous solution by carbon-rich bagasse fly ash (BFA). Batch studies were performed to evaluate the influence of various experimental parameters, namely, initial pH (pH0), adsorbent dose, contact time, initial concentration, and temperature on the removal of furfural. Optimum conditions for furfural removal were found to be pH0 ≈ 5.5, adsorbent dose ≈4 g/L of solution, and equilibrium time ≈4 h. The adsorption followed pseudo-second-order kinetics. The effective diffusion coefficient of furfural is of the order of 10-13 m2/s. Equilibrium adsorption data on BFA was analyzed by Freundlich, Langmuir, Dubnin-Radushkevich, Redlich-Peterson, and Temkin isotherm equations using regression and error analysis. The Redlich-Peterson isotherm was found to best represent the data for furfural adsorption onto BFA. Adsorption of furfural on BFA is favorably influenced by a decrease in the temperature of the operation. Values of the change in entropy (ΔS0) and heat of adsorption (ΔH0) for furfural adsorption on BFA were negative. The high negative value of change in Gibbs free energy (ΔG0) indicates the feasible and spontaneous adsorption of furfural on BFA. 相似文献
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采用“以废治废”工艺,利用锅炉水膜除尘器中高温烟气的浓缩及高扰动状态下粉煤灰的吸附与脱色等效应,处理桐乡市恒生改性纤维有限公司高浓度涤纶聚酯废水,结果表明,烟气可以达到国家规定的排放标准,废水中乙二醇等主要有机污染物质大部分转移至粉煤灰渣中,CODcr综合吸附去除效率可达85.9%,消耗水量1.58t/t煤。 相似文献
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堇青石多孔陶瓷的制备与性能表征 总被引:6,自引:0,他引:6
以粉煤灰和碱式碳酸镁为主要原料制得了堇青石多孔陶瓷材料.烧结温度在1 100~1 350℃时,样品的弯曲强度由50 MPa增加至65 MPa,热膨胀系数由8.07×10-6℃-1下降至4.21×10-6℃-1.优化的烧结工艺为1 300℃保温4 h.样品的孔隙率和孔径随原料中淀粉含量的增加而增加.在原料中添加40%(质量分数)的造孔剂(淀粉)可使样品的孔隙率、平均孔径为和氮气通量分别达到41.7%,2.35μm和0.225 m·h-1Pa-1. 相似文献