Abstract
Purpose
Urban waterways are impacted by diffuse stormwater runoff, yet other discharges can unintentionally contaminate them. The Okeover stream in Christchurch, New Zealand, receives air-conditioning discharge, while its ephemeral reach relies on untreated stormwater flow. Despite rehabilitation efforts, the ecosystem is still highly disturbed. It was assumed that stormwater was the sole contamination source to the stream although water quality data were sparse. We therefore investigated its water and sediment quality and compared the data with appropriate ecotoxicological thresholds from all water sources.
Methods
Concentrations of metals (Zn, Cu and Pb) in stream baseflow, stormwater runoff, air-conditioning discharge and stream-bed sediments were quantified along with flow regimes to ascertain annual contaminant loads. Metals were analysed by ICP-MS following accredited techniques.
Results
Zn, Cu and Pb concentrations from stormflow exceeded relevant guidelines for the protection of 90% of aquatic species by 18-, 9- and 5-fold, respectively, suggesting substantial ecotoxicity potential. Sporadic copper (Cu) inputs from roof runoff exceeded these levels up to 3,200-fold at >4,000 μg L−1 while Cu in baseflow from air-conditioning inputs exceeded them 5.4-fold. There was an 11-fold greater annual Cu load to the stream from air-conditioning discharge compared to stormwater runoff. Most Zn and Cu were dissolved species possibly enhancing metal bioavailability. Elevated metal concentrations were also found throughout the stream sediments.
Conclusions
Environmental investigations revealed unsuspected contamination from air-conditioning discharge that contributed greater Cu annual loads to an urban stream compared to stormwater inputs. This discovery helped reassess treatment strategies for regaining ecological integrity in the ecosystem.
Similar content being viewed by others
References
ANZECC (2000) Australian and New Zealand guidelines for fresh and marine water quality, Australian and New Zealand Environment and Conservation Council
APHA (2005) Standards methods for the examination of water and wastewater, 21st edn. American Public Health Association, Washington DC
Beasley G, Kneale P (2002) Reviewing the impact of metals and PAHs on macroinvertebrates in urban watercourses. Prog Phys Geog 26:236–270
Blakely T, Harding J (2005) Longitudinal patterns in benthic communities in an urban stream under restoration. New Zeal J Mar Fresh 39:17–28
Brown J, Peake B (2006) Sources of heavy metals and polycyclic aromatic hydrocarbons in urban stormwater runoff. Sci Total Environ 359:145–155
CCC (2003) Waterways, wetlands and drainage guide; part B; design. Christchurch City Council, Christchurch
Critchley MM, Cromar NJ, McClure N, Fallowfield HJ (2002) Biofilms in copper plumbing systems: sensitivity to copper and chlorine and implications for corrosion. Wat Sci Technol 2(4):81–87
Davie AP, Shokouhian M, Ni SB (2001) Loading estimates of lead, copper, cadmium, and zinc in urban runoff from specific sources. Chemosphere 44:997–1009
Egodawatta P, Thomas E, Goonetilleke A (2009) Understanding the physical processes of pollutant build-up and wash-off on roof surfaces. Sci Total Environ 407:1834–1841
Gobel P, Dierkes C, Coldewey WC (2007) Storm water runoff concentration matrix for urban areas. J Contam Hydrol 91:26–42
Herngren L, Goonetilleke A, Ayoko GA (2005) Understanding heavy metal and suspended solids relationships in urban stormwater using simulated rainfall. J Environ Manage 76:149–158
Hur J, Yim S, Schlautman MA (2003) Copper leaching from brake wear debris in standard extraction solutions. J Environ Monit 5:837–843
Karlen C, Wallinder IO, Heijerick D, Leygraf C (2002) Runoff rates, chemical speciation and bioavailability of copper released from naturally painted copper. Environ Pollut 120:691–700
Kayhanian M, Stransky C, Bay S, Lau SL, Stenstrom MK (2008) Toxicity of urban highway runoff with respect to storm duration. Sci Total Environ 389:386–406
Lagos GE, Reveco FD, Peters DC, Maggi C (2000) Exposure of the population of Santiago, Chile, to copper contained in drinking water. In: Interdisciplinary perspectives on drinking water risk assessment and management, book series: IAHS publication, issue 260, 112–113
Lee H, Lau S-L, Kayhanian M, Stenstrom MK (2004) Seasonal first flush phenomenon of urban stormwater discharges. Water Res 38:4153–4163
McCready S, Birch G, Long E, Spyrakis G, Greely CR (2006) An evaluation of Australian sediment quality guidelines. Arch Environ Contam Toxicol 50:306–315
Merkel TH, Pehkonen SO (2006) General corrosion of copper in domestic drinking water installations: scientific background and mechanistic understanding. Corros Eng Sci Technol 41:21–37
Mosley LM, Peake BM (2001) Partitioning of metals (Fe, Pb, Cu, Zn) in urban run-off from the Kaikorai Valley, Dunedin, New Zealand. New Zeal J Mar Fresh 35:615–624
Nolan D (2005) Environmental and resource management law, 3rd edn. Lexis Nexis, Wellington
Paul M, Meyer J (2001) Streams in the urban landscape. Annu Rev Ecol Syst 32:333–365
Pennington SL, Webster-Brown JG (2008) Stormwater runoff quality from copper roofing, Auckland, New Zealand. New Zeal J Mar Fresh 42:99–108
Royuela J, Otero E (2003) The assessment of short-term data of pipe corrosion in drinking-water. 2. Copper. Corros Sci 34:1595–1606
Shaw DC, Bible K (1996) An overview of forest canopy ecosystem functions with reference to urban and riparian systems. Northwest Sci 70:1–6
Shedden B, Batchelor J, Chizmar J (2007) Roof runoff study by New Zealand metal roofing manufacturers, South Pacific Stormwater Conference, Auckland, 14 pp
Suren AM, Riis T, Biggs BJF, McMurtrie S, Barker R (2005) Assessing the effectiveness of enhancement activities in urban streams: I. habitat responses. River Res Appl 21:381–401
Sutherland RA, Tack FM, Tolosa C, Verloo M (2000) Operationally defined metal fractions in road deposited sediment, Honolulu, Hawaii. J Environ Qual 29:1431–1439
Tsihrintzis VA, Vasarhelyi GM, Lipa J (1995) Multiobjective approaches in fresh-water wetland restoration and design. Water Int 20:98–105
Waara S, Färm C (2008) An assessment of the potential toxicity of runoff from an urban roadscape during rain events. Env Sci Pollut Res 15:205–210
Walsh C, Roy A, Feminella J, Cottingham P, Groffman P, Morgan R (2005) The urban stream syndrome: current knowledge and search for a cure. J N Am Benthol Soc 24:706–723
Wicke D, Cochrane TA, O’Sullivan AD (2009) Developing a rainfall contaminant relationship model for Christchurch urban catchments. In: Proceedings of the 6th Pacific Stormwater Conference, New Zealand Water Association, Auckland, New Zealand, 29 April–1 May, 10 pp
Winterbourn M, Harding JS, McIntosh A (2007) Responses of benthic fauna of an urban stream during 6 years of restoration. New Zeal Nat Sci 32:1–12
Wood T, Shelley M (1999) A dynamic model of bioavailability of metals in constructed wetland sediments. Ecol Eng 12:231–252
Zanders JM (2005) Road sediment: characterisation and implications for the performance of vegetated strips. Sci Total Environ 339:41–47
Zhang Y, Triantafyllidou S, Edwards M (2008) Effect of nitrification and GAC filtration on copper and lead leaching in home plumbing systems. J Environ Eng-ASCE 134:521–530
Acknowledgements
University of Canterbury Facilities Management, particularly Dr. Kate Hewson, provided logistical support for this study. The Christchurch City Council and Environment Canterbury paid for many of the analytical costs in 2006. Peter McGuigan in the Environmental Engineering Laboratory provided technical guidance and support. Stuart Farrant, Eleanor Taffs, Will Jacobsen and Ingrid Cooper assisted with field reconnaissance and sampling, and Dr. Creon Upton provided feedback on the text.
Author information
Authors and Affiliations
Corresponding author
Additional information
Responsible editor: Vera Slaveykova
Rights and permissions
About this article
Cite this article
O’Sullivan, A., Wicke, D. & Cochrane, T. Heavy metal contamination in an urban stream fed by contaminated air-conditioning and stormwater discharges. Environ Sci Pollut Res 19, 903–911 (2012). https://doi.org/10.1007/s11356-011-0639-5
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11356-011-0639-5