利用季铵盐有机改性铝污泥絮凝除藻试验  

Flocculation and Removal of Algae by Alum Sludge Modified with an Organic Quaternary Ammonium Salt

作　　者：赵晓红 潘颖[1] 韩柳 韦杰文 袁春博 ZHAO Xiao-hong;PAN Ying;HAN Liu;WEI Jie-wen;YUAN Chun-bo(School of Civil Engineering,Chang′an University,Xi′an 710061,P.R.China;Key Laboratory of Water Supply and Drainage,Ministry of Housing and Urban-Rural Development,Chang′an University,Xi′an 710061,P.R.China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]长安大学,住房与城乡建设部给水排水重点试验室,陕西西安710061

出　　处：《水生态学杂志》2021年第1期116-122,共7页Journal of Hydroecology

摘　　要：选择具有良好吸附沉降性能的给水厂副产物铝污泥作为下沉载体替代粘土,探究季铵盐十六烷基三甲基溴化铵(CTAB)对铝污泥的吸附改性,并将其用于常见淡水小球藻(Chlorella)的絮凝去除试验。结果显示:(1)经600℃焙烧后的铝污泥对浓度为36.4 mg/L的CTAB改性溶液吸附能力最强,10 min内即可达到吸附平衡,吸附容量为9.19 mg/g;(2)当改性铝污泥中原始用量为3.0 g/L时,24 h后对藻密度和浊度的去除率可分别达到80.25%和80.05%;(3)改性剂CTAB不会影响铝污泥对磷酸盐的吸附性能,改性前后的铝污泥对磷的最大吸附率分别为90.91%和90.77%,且都在2 h左右达到吸附平衡。研究表明,有机改性铝污泥可初步形成一个除藻抑藻体系,可为藻类的去除和铝污泥的资源化利用提供理论依据及技术支持。Excessive growth of algae in eutrophic freshwater threatens aquatic ecosystems and the health of local residents. Among algae removal methods, clay flocculation is the most promising technique and has attracted considerable attention. However, large quantities of clay are required for large scale algae removal and clay resources are finite. Research has shown that alum sludge, a by-product of conventional water treatment, has good adsorption and sedimentation performance and can be used rather than clay. In this study, hexadecyltrimethylamine bromide(CTAB), an organic quaternary ammonium salt, was used to modify alum sludge for the first time and the removal efficiency of Chlorella was tested. Results show that:(1) Alum sludge calcined at 600℃ has the best adsorption capacity for CTAB(36.4 mg/L), and adsorption equilibrium was achieved within 10 min(9.19 mg/g);(2) After 24 h, at a dose level of 3.0 g/L, modified alum decreased the algal density and turbidity, respectively, by 80.25% and 80.05%;(3) CTAB had little effect on phosphorus adsorption by alum sludge. Phosphorus removal reached 90.91% and 90.77%, respectively, by raw alum sludge and modified alum sludge, and equilibrium was achieved after 2 h in both cases. To summarize, this research demonstrates that a waste product, alum sludge, can be modified and used to remove algae and control phosphorus from eutrophic waters.

关 键 词：铝污泥 CTAB 有机改性 小球藻 

分 类 号：X820.6[环境科学与工程—环境工程]