Chemical precipitation technology is used for treating mining influenced water.
Activated Charcoal–magnetic nanocomposite for remediation of simulated dye polluted wastewater.
http://www.iwaponline.com/wst/up/wst2015082.htm
Metal sulfide recovery in sulfate reducing bioreactors is a challenge due to the formation of small precipitates with poor settling properties. The size of the metal sulfide precipitates with the change in operational parameters such as pH, sulfide concentration and reactor configuration has been previously studied. The effect of the hydraulic retention time (HRT) on the metal precipitate characteristics such as particle size for settling has not yet been addressed.
http://onlinelibrary.wiley.com/doi/10.1002/jctb.4296/full
Ettringite precipitation to remove sulfate, metals and metalloids from mine effluents is being developed. The link below includes some information on the subject:
http://www.wateronline.com/doc/a-new-process-for-sulfate-removal-from-indust-0001
Acid Mine Drainage (AMD) and the contaminants associated with it is the most
persistent environmental pollution problem, which occurs worldwide at both active and
abandoned mine sites. It is formed by a series of complex geo-chemical and microbial
reactions that occur when water comes in contact with pyrite in metal-ore/coal in presence
of oxygen. In India many metal and coal mines are generating acidic drainage, which
causes soil, and water pollution problem at nearby areas. This paper reviews the basic
chemistry of AMD, its characteristics and environmental impacts, further the problem at
various sites of Indian mining industry are discussed.
http://cafetinnova.org/wp-content/uploads/2013/05/02041217.pdf
Chemical technology can be used in conjuction with other treatment or by itself,depending on site conditions. The optimal process and its efficiency depend on several factors, including flow rate or volume,contaminants and their contaminations,other water parameters,discharge criteria,site access, and sludge disposal options.
Here are some links to CSIRO's Hydrotalcite process, which works really well with Mine Acid Waste in ponds. I've been involved with it quite a lot.
https://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CB0QFjAA&url=https%3A%2F%2Fpublications.csiro.au%2Frpr%2Fdownload%3Fpid%3Dcsiro%3AEP10750%26dsid%3DDS1&ei=ORkVVfjDMYOJ8QX864HwAg&usg=AFQjCNEeesUu2QJx04GTk8B8YqdpoGBKFQ&sig2=Jgbp71_9OA_PiRAY6XpLRQ&bvm=bv.89381419,d.dGc
http://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0CCUQFjAB&url=http%3A%2F%2Fwww.imwa.info%2Fdocs%2Fimwa_2009%2FIMWA2009_Douglas.pdf&ei=ORkVVfjDMYOJ8QX864HwAg&usg=AFQjCNFC9Har7L14_VA9en2vGnjW44Y_Cw&sig2=K1OmgkvdtgmpUCtFZM_3kQ&bvm=bv.89381419,d.dGc
http://www.mining.com/web/csiro-has-developed-a-new-treatment-for-removing-contaminants-from-mining-wastewaters-it-is-set-to-make-water-management-practices-across-the-mining-industry-more-sustainable/
http://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=8&cad=rja&uact=8&ved=0CFEQFjAH&url=http%3A%2F%2Fwww.iaea.org%2FOurWork%2FNE%2FNEFW%2FTechnical-Areas%2FNFC%2Fdocuments%2Furanium%2Ftm-isl-2013%2F13.Douglas_2013_Hydrotalcite_contaminant_removal.pdf&ei=ORkVVfjDMYOJ8QX864HwAg&usg=AFQjCNGF6kItHdDe9H1eUXQCivHpsHUXdA&sig2=oJK7RVPBrpQG6nffYOKX7A&bvm=bv.89381419,d.dGc
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