Removal of highly polar micropollutants from wastewater by powdered activated carbon

被引:111
作者
Kovalova, Lubomira [1 ,2 ]
Knappe, Detlef R. U. [3 ]
Lehnberg, Kai [1 ]
Kazner, Christian [4 ]
Hollender, Juliane [2 ]
机构
[1] Rhein Westfal TH Aachen, Inst Hyg & Environm Med, D-52074 Aachen, Germany
[2] Eawag, Swiss Fed Inst Aquat Sci & Technol, CH-8600 Dubendorf, Switzerland
[3] N Carolina State Univ, Dept Civil Construct & Environm Engn, Raleigh, NC 27695 USA
[4] Rhein Westfal TH Aachen, Dept Chem Engn, D-52056 Aachen, Germany
关键词
Adsorption; Powdered activated carbon; Wastewater treatment; Polar compound; Trace organic compound; Micropollutant; Pharmaceuticals; Cytostatic; TRACE ORGANIC-COMPOUNDS; MEMBRANE BIOREACTOR; NATURAL-WATER; ADSORPTION; PAC; CYTOSTATICS; CONTAMINANTS; ELIMINATION; METABOLITES; ENVIRONMENT;
D O I
10.1007/s11356-012-1432-9
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Due to concerns about ecotoxicological effects of pharmaceuticals and other micropollutants released from wastewater treatment plants, activated carbon adsorption is one of the few processes to effectively reduce the concentrations of micropollutants in wastewater. Although aimed mainly at apolar compounds, polar compounds are also simultaneously removed to a certain extent, which has rarely been studied before. In this study, adsorption isotherm and batch kinetic data were collected with two powdered activated carbons (PACs) to assess the removal of the polar pharmaceuticals 5-fluorouracil (5-Fu) and cytarabine (CytR) from ultrapure water and wastewater treatment plant effluent. At pH 7.8, single-solute adsorption isotherm data for the weak acid 5-Fu and the weak base CytR showed that their adsorption capacities were about 1 order of magnitude lower than those of the less polar endocrine disrupting chemicals bisphenol A (BPA) and 17-alpha-ethinylestradiol (EE2). To remove 90 % of the adsorbate from a single-solute solution 14, 18, 70, and 87 mg L-1 of HOK Super is required for EE2, BPA, CytR, and 5-Fu, respectively. Effects of solution pH, ionic strength, temperature, and effluent organic matter (EfOM) on 5-Fu and CytR adsorption were evaluated for one PAC. Among the studied factors, the presence of EfOM had the highest effect, due to a strong competition on 5-Fu and CytR adsorption. Adsorption isotherm and kinetic data and their modeling with a homogeneous surface diffusion model showed that removal percentage in the presence of EfOM was independent on the initial concentration of the ionizable compounds 5-Fu and CytR. These results are similar to neutral organic compounds in the presence of natural organic matter. Overall, results showed that PAC doses sufficient to remove > 90 % of apolar adsorbates were able to remove no more than 50 % of the polar adsorbates 5-Fu and CytR and that the contact time is a critical parameter.
引用
收藏
页码:3607 / 3615
页数:9
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