Media selection for sustainable phosphorus removal in subsurface flow constructed wetlands

被引:201
作者
Brix, H
Arias, CA
del Bubba, M
机构
[1] Univ Aarhus, Dept Plant Ecol, DK-8240 Risskov, Denmark
[2] Univ Politecn Cataluna, Dept Hydraul, ES-08034 Barcelona, Spain
[3] Univ Florence, Dept Analyt Chem, I-50121 Florence, Italy
关键词
constructed wetland; filter media; phosphorus; phosphorus sorption; reed beds; vertical-flow system; water treatment;
D O I
10.2166/wst.2001.0808
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Sorption of phosphorus (P) to the bed sand medium is a major removal mechanism for P in subsurface flow constructed wetlands. Selecting a sand medium with a high P-sorption capacity is therefore important to obtain a sustained P-removal. The P-removal capacities of 13 Danish sands were evaluated and related to their physico-chemical characteristics. The P-removal properties of sands of different geographical origin varied considerably and the suitability of the sands for use as media in constructed reed beds thus differs. The P-sorption capacity of some sands would be used up after only a few months in full-scale systems, whereas that of others would subsist for a much longer time. The most important characteristic of the sands determining their P-sorption capacity was their Ca-content. Also the P-binding capacities of various artificial media were tested (light-expanded-clay-aggregates (LECA), crushed marble, diatomaceous earth, vermiculite and calcite). Particularly calcite and crushed marble were found to have high P-binding capacities. It is suggested that mixing one of these materials into the sand or gravel medium can significantly enhance the P-sorption capacity of the bed medium in a subsurface-flow constructed wetland system. It is also possible to construct a separate unit containing one of these artificial media. The media may then be replaced when the P-binding capacity is used up.
引用
收藏
页码:47 / 54
页数:8
相关论文
共 17 条
[1]  
[Anonymous], 1998, WATER ENVIRON RES, DOI DOI 10.1002/IROH.19980830517
[2]   Phosphorus removal by sands for use as media in subsurface flow constructed reed beds [J].
Arias, CA ;
Del Bubba, M ;
Brix, H .
WATER RESEARCH, 2001, 35 (05) :1159-1168
[3]   Do macrophytes play a role in constructed treatment wetlands? [J].
Brix, H .
WATER SCIENCE AND TECHNOLOGY, 1997, 35 (05) :11-17
[4]  
Brix H, 1999, NUTRIENT CYCLING AND RETENTION IN NATURAL AND CONSTRUCTED WETLANDS, P155
[5]  
Ciupa R., 1996, P 5 INT C WETL SYST, P6
[6]  
Day P.R., 1965, METHODS SOIL ANAL 1, P562, DOI DOI 10.2134/AGRONMONOGR9.1.C43
[7]  
Drizo A, 1997, WATER SCI TECHNOL, V35, P95, DOI 10.1016/S0273-1223(97)00057-7
[8]  
*EPA, 1999, ENV GUIDELINES, V1, P1
[9]   Removal of nutrients from combined sewer overflows and lake water in a vertical-flow constructed wetland system [J].
Gervin, L ;
Brix, H .
WATER SCIENCE AND TECHNOLOGY, 2001, 44 (11-12) :171-176
[10]   The challenge of managing water and material balances in relation to eutrophication [J].
Harremoes, P .
WATER SCIENCE AND TECHNOLOGY, 1998, 37 (03) :9-17