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Lisle, Andrew
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Given Name
Andrew
Andrew
Surname
Lisle
UNE Researcher ID
une-id:alisle2
Email
alisle2@une.edu.au
Preferred Given Name
Andrew
School/Department
School of Environmental and Rural Science
1 results
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- PublicationUse of Chemical and Biological Agents to Improve Water Quality of Effluent Discharge from Abattoirs(Asian-Australasian Association of Animal Production Societies, 2004)
; ;Murray, P J; Al Jassim, R A MIntensive animal industries create large volumes of nutrient rich effluent which, if untreated, has the potential for substantial environmental degradation and to recover valuable nutrients that would otherwise be lost. Members of the family 'Lemnaceae' are widely used in lagoon systems, to achieve inexpensive and efficient remediation of effluent. Only limited research has been conducted into their growth in highly eutrophic media and there has been little done to systematically distinguish between different types of media. This study examined the growth characteristics of duckweed in abattoir effluent and explored possible ways of ameliorating the inhibitory factors to growth on this medium. A series of pot trials was conducted to test the tolerance of duckweed to abattoir effluent partially remediated by a sojourn in anaerobic fermentation ponds, both in its unmodified form and after the addition of acid to manipulate pH, and the addition of bentonite . Unmodified abattoir effluent was highly toxic to duckweed, even at dilutions of 3: 1. Duckweed remained viable and grew sub-optimally in simplified media with total ammonia nitrogen (TAN) concentrations of up to 100 mg/L. Duckweed grew vigorously in effluent diluted 1:4 v/v, containing 56 mg TAN /L when modified by addition of acid (to decrease pH to 7) and bentonite at 0.5%. The results of this study suggest that bentonite plays an important role in modifying the toxicity of abattoir effluent to duckweed.