Floating Treatment Wetland influences on the fate of metals in road runoff retention ponds

被引:57
作者
Borne, Karine E. [1 ]
Fassman-Beck, Elizabeth A. [1 ]
Tanner, Chris C. [2 ]
机构
[1] Univ Auckland, Civil & Environm Dept, Auckland Mail Ctr, Auckland 1142, New Zealand
[2] Natl Inst Water & Atmospher Res, Hamilton, New Zealand
关键词
Copper; Zinc; Fate; Floating Treatment Wetland; Plant; Sediment; TYPHA-LATIFOLIA; CONSTRUCTED WETLANDS; STORMWATER TREATMENT; NATURAL WETLAND; ORGANIC-MATTER; HIGHWAY RUNOFF; ROOT SURFACE; HEAVY-METALS; SEDIMENTS; REMOVAL;
D O I
10.1016/j.watres.2013.09.056
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A field trial comparing the fate of metals in two parallel stormwater retention ponds, one of which was retrofitted with a Floating Treatment Wetland (FTW), was carried out near Auckland, New Zealand. Results suggest that the FTW increased metal accumulation in the pond sediment especially in summer due to lower sediment Eh, more anoxic water column, neutral pH and greater source of organic matter (OM) induced by the FTW. These factors combined with higher temperature enhanced metal sorption onto OM, flocculation of particulate pollutants, metal sulphide formation and reduced OM degradation and thus limited release of metals. Unlike Zn, Cu speciation in the pond sediment was relatively unchanged under various sediment Eh conditions due to its strong binding property with sulphide and OM. Occasional moderate metal release was detected from the FTW pond sediment likely due to aerobic OM degradation at the beginning of spring and/or hydroxides reduction when sediments became reduced later in the season. No release was noticed from the conventional pond sediment likely due to biosorption and/or uptake by algae which developed in the conventional pond and settled on the bottom sediment. Direct uptake by the plants of the FTW and sorption onto root plaques are not thought to be significant removal pathways. Nevertheless roots play a major role in trapping particulate pollutants, eventually sloughing off to settle on the bottom of the pond, and provide an adequate substrate for bacterial development due to release of organic compounds which are both essential for dissolved metal sorption and metal sulphide formation. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:430 / 442
页数:13
相关论文
共 57 条
[1]  
[Anonymous], 2000, Australian and New Zealand Guidelines for Fresh and Marine Water Quality
[2]  
[Anonymous], EFFECTS ROAD TRANSPO
[3]  
[Anonymous], 2005, Standard methods for the examination of water and waste- water
[4]  
[Anonymous], 2011, STANDARD METHODS EXA
[5]   Aluminium and phosphate uptake by Phragmites australis:: the role of Fe, Mn and Al root plaques [J].
Batty, LC ;
Baker, AJM ;
Wheeler, BD .
ANNALS OF BOTANY, 2002, 89 (04) :443-449
[6]   Stormwater treatment: do constructed wetlands yield improved pollutant management performance over a detention pond system? [J].
Bavor, HJ ;
Davies, CM ;
Sakadevan, K .
WATER SCIENCE AND TECHNOLOGY, 2001, 44 (11-12) :565-570
[7]   Relationship of plant growth and actual evapotranspiration to irrigation frequency based on management allowed deficits for container nursery stock [J].
Beeson, RC .
JOURNAL OF THE AMERICAN SOCIETY FOR HORTICULTURAL SCIENCE, 2006, 131 (01) :140-148
[8]   Stormwater nitrogen removal performance of a floating treatment wetland [J].
Borne, Karine E. ;
Tanner, Chris C. ;
Fassman-Beck, Elizabeth A. .
WATER SCIENCE AND TECHNOLOGY, 2013, 68 (07) :1657-1664
[9]   Floating treatment wetland retrofit to improve stormwater pond performance for suspended solids, copper and zinc [J].
Borne, Karine E. ;
Fassman, Elizabeth A. ;
Tanner, Chris C. .
ECOLOGICAL ENGINEERING, 2013, 54 :173-182
[10]  
Brezonik P., 2011, WATER CHEM INTRO CHE