Effects of activated sludge on the degradation of chlorate in soils under varying environmental conditions

Jiang, Chunxiao and Li, Huashou and Lin, Chuxia (2009) Effects of activated sludge on the degradation of chlorate in soils under varying environmental conditions. Journal of Hazardous Materials, 162 (2-3). pp. 1053-1058. ISSN 0304-3894


Incubation experiments were conducted to examine the effects of activated sludge on degradation of chlorate in soils. The results show that application of activated sludge could significantly promote the decomposition of soil chlorate though the degradation rate of chlorate did not necessarily increase with increasing application rate of the sludge. The effectiveness of activated sludge on soil chlorate degradation was significantly affected by temperature, moisture content and pH. There is a tendency that the rate of chlorate decomposition increased with increasing temperature and moisture content until optimal values of temperature and moisture content were reached. This can be attributed to the enhanced activity of chlorate-reducing microorganisms in hot and more reducing soil conditions. Soil pH also had important controls on the decomposition of chlorate. The experimental results demonstrate that neutral pH more favoured the degradation of soil chlorate, compared to either acidic or alkaline pH. While soil organic matter content could affect chlorate decomposition, its impact on the effectiveness of activated sludge on chlorate degradation was minor. This study has implications for developing cost-effective techniques for remediating chlorate-contaminated soils, particularly in the longan-producing countries.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy.
Faculty/School / Institute/Centre: Current - USQ Other
Faculty/School / Institute/Centre: Current - USQ Other
Date Deposited: 01 Jul 2011 11:09
Last Modified: 17 Oct 2014 00:04
Uncontrolled Keywords: activated sludge; biodegradation; chlorate; longan plantation; remediation technique; soil
Fields of Research (2008): 10 Technology > 1002 Environmental Biotechnology > 100203 Bioremediation
03 Chemical Sciences > 0399 Other Chemical Sciences > 039901 Environmental Chemistry (incl. Atmospheric Chemistry)
05 Environmental Sciences > 0503 Soil Sciences > 050302 Land Capability and Soil Degradation
Fields of Research (2020): 41 ENVIRONMENTAL SCIENCES > 4103 Environmental biotechnology > 410303 Bioremediation
37 EARTH SCIENCES > 3701 Atmospheric sciences > 370104 Atmospheric composition, chemistry and processes
41 ENVIRONMENTAL SCIENCES > 4106 Soil sciences > 410601 Land capability and soil productivity
Socio-Economic Objectives (2008): D Environment > 96 Environment > 9614 Soils > 961499 Soils not elsewhere classified
Identification Number or DOI: https://doi.org/10.1016/j.jhazmat.2008.05.159
URI: http://eprints.usq.edu.au/id/eprint/18834

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