城市污水厂剩余污泥对水中F-的吸附性能研究

利用城市污水处理厂的剩余污泥对水中F-进行吸附处理,通过污泥投加量、F-初始质量浓度、时间、pH等反应条件的研究,探讨除氟效果和影响因素。结果表明,室温下,污泥对F-的吸附在60 min后达到平衡;20 g/L的污泥投加量对10 mg/L含氟水的F-去除率可达83.1%;污泥可在3~10的较大pH范围内保持稳定的除氟效果。准二级动力学模型很好地拟合了污泥对F-的吸附行为,Langmuir和Freundlich模型均符合污泥对F-的吸附特性,热力学参数的计算表明该吸附过程是自发的放热反应。

Adsorption properties of sewage sludge on fluoride removal

Sewage sludge produced by municipal wastewater treatment plants was utilized to remove fluoride in the water.The effects of sludge dosage,initial fluoride concentration,reaction time,pH value and other parameters were discussed,respectively.The results showed that adsorption equilibrium was achieved after the reaction of 60 min un-der room temperature.The removal rate of 10 mg/L fluoride water could reach up to 83.1%with the sludge dosage of 20 g/L.High removal rate could be obtained in a wide pH range(3-10).The adsorption of fluoride onto sew-age sludge followed pseudo-second-order kinetic model and was mainly controlled by chemical adsorption.The ad-sorptive processes were also well fitted with both Langmuir and Freundlich models.The thermodynamic study indica-ted that it was a spontaneous and exothermic reaction.