污泥活性炭对莠去津的吸附性能研究

Study on the Adsorption Performance of Sludge Activated Carbon for Atrazine

除草剂使用后残留的莠去津对土壤造成严重污染,影响土壤的正常功能,而剩余污泥是城市污水处理厂产生的二次污染物,二者都是目前需要解决的环境问题。为研究污泥活性炭对除草剂中莠去津的吸附能力,以城市污水处理厂剩余污泥为原料,以表面活性剂(F127)为活化剂,制备改性污泥活性炭,并探究其对莠去津的吸附性能。结果表明,污泥活性炭对莠去津的吸附符合伪二级动力学模型,最大吸附量为3.47 mg/g。等温吸附试验结果表明,污泥活性炭对莠去津的吸附符合Frendlich模型,最大去除率和最大吸附量分别为66%和2.86 mg/g。吸附热力学试验结果表明,F127改性污泥活性炭温度越低,吸附效果越好,温度影响较大。

The residual atrazine after herbicide use causes serious pollution to the soil,affecting its normal function,and the remaining sludge is a secondary pollutant generated by urban sewage treatment plants,and both are environmental problems that need to be addressed at present.In order to study the adsorption capacity of sludge activated carbon for herbicide atrazine,this study prepares modified sludge activated carbon using residual sludge from urban sewage treatment plants as raw material and surfactant(F127)as activator,and explores its adsorption performance for atrazine.The results show that the adsorption of atrazine by sludge activated carbon follows a pseudo second order kinetic model,with a maximum adsorption capacity of 3.47 mg/g.The isothermal adsorption test results show that the adsorption of atrazine by sludge activated carbon conforms to the Frendlich model,with a maximum removal rate and maximum adsorption capacity of 66%and 2.86 mg/g,respectively.The adsorption thermodynamic test results show that the lower the temperature of F127 modified sludge activated carbon,the better the adsorption effect,and the temperature has a significant impact.