Acid Sulfate and Acid Rock Drainage

This is an online resource that will provide you with relevant documents as well as detailed information that relates to Acid Sulfate Soils and Acid Rock Drainage. This information can be particularly helpful to you if you attended the 6th ASSARD Conference, as they were the main topics discussed during the event.

Some soils which have a presence of metallic sulfides can become Acid Sulfate Soils (ASS). This is because these sulfides can oxidize and become acidic upon contact with environmental moisture. This type of soil are present in many areas of the world and not tied to any specific geographic location. If they are not managed properly, they can cause problems for the surrounding environment as well as agriculture.

Acid Rock Drainage (ARD) is a flow of acidic water from disaffected metal or coal mines. However, this problem is not limited to mining areas. There are other places where the earth was moved, such as construction sites, tunnels, etc. that can contribute to the problem of Acid Rock Drainage. There are multiple localities where liquid that is drained from any type of facility that handles coal is highly acidic and is known as ARD. This phenomenon is not exclusive to man-made activities and does occur naturally as well when water flows over certain types of acidic rock. However, it can be made a lot worse in places where large amount of earth is moved such as in mining and during large scale construction projects. ARD has a higher chance of occurring in environments where the rock contains a large amount of sulfide minerals.

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There are ways of testing or checking to see whether something is acidic. You can use paper that is soaked in a special chemical (litmus paper) or you can use some plants, for example the roots of the Wol or Noni (Morinda citrifolia) plant. If the substance you are testing is acidic, the colour of the litmus paper or Noni roots will change.

Publication: http://www.coralcoe.org.au/research/simonpng/EEPL_3_acidrunoff.pdf

Acid Rock Drainage is of great importance to environmental regulators and mine operators in many countries around the world. During the operational of the life the installation, the collect and treat strategy is a commonly employed strategy to reduce pollutant emissions to the environment. Regarding the post-operational scenarios a suite of strategies is available in the literature.

Publication: http://www.imwa.info/docs/BeloHorizonte/Remediation.pdf

Kinetics of mixed-bacterial assemblages from acidic sulfate soil samples was investigated in terms of growth rate, waste and sulfate reduction rate under both typical anaerobic condition an sulfate reducing condition. The biomass inoculum from the mixed culture originate4d from acidic sulfate soil was started up to ambient temperature by a synthetic glucose-based substrate in a semicontinuous-flow mode.

Publication: http://www.op.mahidol.ac.th/orra/orra_tha/info/annual_abstract/2008/02_abstract_2008_EG.pdf

International Conference – abstract deadline extended

The 6 International Acid Sulfate Soil Conference will be held in China from 16-20 September. The conference, which will be run in conjunction with the Acid Rock Drainage Symposium, provides researchers and industry with an opportunity to highlight new developments and identify directions for future research on acid sulfate soil related issues.

Publication: http://www.dpi.nsw.gov.au/__data/assets/pdf_file/0005/218489/ASSAY-44.pdf