摘要
Abstract
Currently,the treatment of acidic wastewater faces challenges such as insufficient control accuracy and high costs,necessitating the development of efficient and low-cost treatment technologies.To address this need,an industrial solid waste resource utilization strategy was adopted,using quicklime as the raw material and coal gasification slag as a pore-forming agent,solid waste-based porous Ca/Al fillers were prepared via molding and sintering.The microstructure of the product was characterized by SEM,TGA,XRD and FTIR,providing a comprehensive evaluation of its structural properties.The acid wastewater neutralization and controlled-release performance of the fillers were investigated,with key parameters such as dosage,temperature,stirring speed and reaction time being examined.The results show that under the optimal reaction conditions of a dosage of 25 mg/L,reaction temperature at room temperature,stirring speed at 280 r/min and reaction time at 260 min,the pH of the acidic wastewater is balanced to 6-8,fully complying with the standard GB 8978-1996.Moreover,the pH buffering process of the solid waste-based porous Ca/Al fillers for acidic wastewater follows the first order reaction kinetic model.When the wastewater circulates through the simulated wetland device for 10 times,the pH stabilizes at 7.38,which meeting the discharge requirements.关键词
多孔钙/铝填料/煤气化渣/缓释/反应动力学/pHKey words
porous Ca/Al filler/coal gasification slag/sustained release/reaction kinetics/pH分类
化学化工
