Li Ya-Qiang, Hu Kai, Zhao Qing-Liang, Tang Feng, Liu Zhi-Gang, Cui Fu-Yi
State Key Laboratory of Urban Water Resources and Environment, School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
Huan Jing Ke Xue. 2007 Nov;28(11):2507-14.
Fly ash was investigated as a raw material for the preparation of a composite coagulant with sulfuric acid. Types of acid solution, H2SO4 concentration, ratio of H2SO4 to fly ash and stirring time were respectively examined as factors that influenced the efficiency of converting the iron and aluminum components into a composite coagulant and coagulation performance on domestic wastewater. The coagulant was attained at the condition of H2SO4-fly ash ratio of 5 mL/g, H2SO4 of 2 mol/L, stirring time of 4h and stabling time of 30 min, and contained Fe3+ of 0.010 8 mol/L with conversion efficiency of 11.4% and Al3+ of 0.035 4 mol/L with conversion efficiency of 4.3%. Removal efficiencies of COD and SS by this type of coagulant reached 70.4% and 91.9% respectively when treating domestic wastewater. This study provides a promising means to utilize fly ash for coagulation, which possibly makes wastewater treatment more economical and more sustainable.
研究了粉煤灰作为与硫酸制备复合混凝剂的原料。分别考察了酸溶液类型、硫酸浓度、硫酸与粉煤灰的比例以及搅拌时间等因素对铁和铝组分转化为复合混凝剂的效率以及对生活污水的混凝性能的影响。在硫酸与粉煤灰比例为5 mL/g、硫酸浓度为2 mol/L、搅拌时间为4 h和稳定时间为30 min的条件下制得混凝剂，其Fe3+含量为0.010 8 mol/L，转化效率为11.4%；Al3+含量为0.035 4 mol/L，转化效率为4.3%。该类型混凝剂处理生活污水时，COD和SS的去除率分别达到70.4%和91.9%。本研究为利用粉煤灰进行混凝提供了一种有前景的方法，这可能使废水处理更经济、更可持续。
