Stormwater reuse treatment requirements and screening-level risk assessment at two urban spatial scales

Brodie, Ian M. (2012) Stormwater reuse treatment requirements and screening-level risk assessment at two urban spatial scales. Journal of Water Reuse and Desalination, 2 (1). pp. 13-21. ISSN 2220-1319

Abstract

Monitoring was conducted at two urban spatial scales (lot-scale road surface and residential subdivision) to assess treatment requirements for nonpotable stormwater reuse by irrigation. A screening-level risk assessment was also made focusing on metals, nutrients, cations and pesticides. Composite stormwater samples were taken at two locations in Toowoomba, Australia. Road runoff had higher treatment requirements for suspended solids but less for disinfection. No organic load or salinity reduction is generally needed and pH adjustment is an occasional requirement for road runoff only. For both stormwaters, hardness was rated at very soft which may potentially increase corrosion of irrigation equipment. Sodium adsorption ratios were also low indicating a limited risk of soil degradation under irrigation. Nutrient and metal concentrations also pose a low risk. High turbidity and low alkalinity of road runoff makes it easier to treat with coagulants compared to the subdivision runoff. Pesticide analysis of 121 compounds found road runoff concentrations below levels of detection, except for Simazine and Hexazinone. Although detectable, these pesticide concentrations were within Australian drinking water guidelines.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Depositing User: Mr Ian Brodie
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 12 Aug 2012 05:12
Last Modified: 03 Jul 2013 01:12
Uncontrolled Keywords: stormwater harvesting; urban runoff; nonpotable reuse; water quality monitoring; risk assessment
Fields of Research (FOR2008): 09 Engineering > 0907 Environmental Engineering > 090702 Environmental Engineering Modelling
09 Engineering > 0905 Civil Engineering > 090508 Water Quality Engineering
03 Chemical Sciences > 0399 Other Chemical Sciences > 039903 Industrial Chemistry
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9609 Land and Water Management > 960912 Urban and Industrial Water Management
Identification Number or DOI: 10.2166/wrd.2012.057
URI: http://eprints.usq.edu.au/id/eprint/21311

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