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TECHNICAL REPORTS

Waste Management

Environmental Risk Assessment of Compost Prepared from Salvinia, Egeria densa, and Alligator Weed

^a ableblue Pty Ltd., 450 Haydens Rd. Nareen VIC 3315 Australia
^b University of Tasmania, Hobart, TAS, Australia
^c Grains Research and Development Corporation, Kingston, Kingston, ACT, Australia
^d NSW Dep. of Primary Industries, Camden, NSW, Australia
^e NSW Dep. of Primary Industries, Richmond, NSW, Australia
^f Sydney Catchment Authority, Penrith NSW, Australia. Research was performed at NSW Department of Primary Industries' Centre for Recycled Organics in Agriculture, Camden, NSW

^* Corresponding author (dorahy42{at}hotmail.com).

Received for publication October 18, 2007. Approximately 70,000 m³ of salvinia (Salvinia molesta) was removed from the Hawkesbury-Nepean River, New South Wales (NSW), Australia, during 2004. This study assessed the risks associated with applying compost prepared from aquatic weeds (AWC) to land, namely, survival and spread of aquatic and terrestrial weeds, eutrophication of waterways, accumulation of heavy metals and phytotoxicity. The results demonstrate composting is an effective method of reducing the viability of aquatic and terrestrial weeds. However, mortality of alligator weed (Alternanthera philoxeroides), which was used as an indicator plant, was significantly (P < 0.001) correlated with the temperature within the windrows and the length of time the material was subjected to composting. Conditions within the central core of the windrow were sufficient to kill the alligator weed, although not all of the aquatic weed material was exposed to the windrows' central core. This resulted in alligator weed continuing to grow at the base of the windrow. To reduce the risk of weeds surviving and spreading in aquatic and terrestrial environments it is suggested compost windrows should be located on an appropriate hard pad to enable complete mixing of the material and ensure all material is exposed to temperatures >55°C for greater than three consecutive days. The likelihood of other risks associated with the AWC was low. If composting is selected as the preferred method for managing organic material harvested from waterways, then ongoing monitoring and evaluation is required to validate the composting process and ensure consumer confidence in the final product.

Abbreviations: AWC, aquatic weed compost • CDD, cumulative degree days • NSW, New South Wales