Abstract：
:Crab-shell chitin was evaluated as a multifunctional substrate for treating acid mine drainage (AMD) in both batch-microcosms and continuous-flow column tests. In microcosms, crab-shell chitin was able to treat AMD from three different sites with similar results: pH increased from 3.5 to approximately 7.5 within 2 days; alkalinity increased at a rate of 37.9+/-2.2 mg CaCO(3)/L day; and sulfate was reduced at a rate of -13.6+/-2.6 mg SO(4)(2-)/L day. In columns, a hydraulic retention time of 11.2 h was enough to raise the pH from 3.5 to approximately 7.5. Alkalinity increased at a rate of 50+/-20 mg CaCO(3)/day, and lasted throughout the duration of the test (125 days, 268 pore volumes (PV)) without showing signs of exhaustion. Metals (Al, Fe, and Mn) were completely removed for 171 PV, and geochemical modeling indicates that they likely precipitated as insoluble hydr(oxides), sulfides, and carbonates. Manganese and iron breakthroughs occurred after 174 and 234 PV, respectively, whereas aluminum breakthrough was never observed. These results demonstrate for the first time that crab-shell chitin can completely remove metals and neutralize the pH of AMD under continuous-flow conditions.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Robinson-Lora MA,Brennan RAdoi
10.1016/j.biortech.2008.11.063subject
Has Abstractpub_date
2009-11-01 00:00:00pages
5063-71issue
21eissn
0960-8524issn
1873-2976pii
S0960-8524(09)00596-3journal_volume
100pub_type
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