摘要： 采用污水厂污泥、黏土及粉煤灰烧制污泥陶粒，用NaOH溶液对其改性制得碱改性污泥陶粒（AMSC），对AMSC进行SEM表征，并考察其对水中Ni²⁺的吸附性能，同时研究AMSC吸附模拟废水中Ni²⁺的反应机理。结果表明：AMSC表面呈蜂窝状结构，在初始Ni²⁺为10 mg/L、AMSC投加量为28 g/L、pH为7~8、20℃条件下反应180 min，AMSC对Ni²⁺的去除率可达98%。pH对AMSC吸附Ni²⁺影响显著，最佳pH范围为4.09~10.02，对应的Ni²⁺去除率在83.25%~96%。AMSC对Ni²⁺的吸附过程符合准二级反应动力学模型及Langmuir等温吸附模型。

关键词: 污泥陶粒, 碱改性, Ni²⁺, 吸附

Abstract: Sludge ceramsite has been calcined with waste activated sludge,clay,fly ash in a wastewater plant,and modified with NaOH solution,so as to obtain alkaline modified sludge ceramsite(AMSC). ASMC has been characterized by means of SEM,and its adsorption capability for Ni²⁺ from water investigated,and the reaction mechanism of AMSC adsorption for Ni²⁺ from simulated wastewater investigated. The results show that the surface structure of AMSC is honeycombed. The removal rate of Ni²⁺ by AMSC is 98%,when the initial concentration of Ni²⁺ is 10 mg/L,the dosage of AMSC 28 g/L,pH 7-8,temperature 20℃ and reaction time 180 min. Its pH has significant influence on the AMSC adsorption for Ni²⁺. The optimal pH range is 4.09-10.02,and the corresponding Ni²⁺ removing rates range 83.25%-96%.The AMSC adsorption process for Ni²⁺ complies with pseudo-second order reaction kinetics model and Langmuir isothermal adsorption model.

Key words: sludge ceramsite, alkaline modification, nickle, adsorption

中图分类号: 

• X703