Removal of $Ca^{2+}$ and $Fe^{3+}$ in Acid Mine Drainage by Tripolyphosphates

This study evaluates tripolyphosphate's ability to treat AMD (Acid Mine Drainage). Based on the batch test results for reaction between tripolyphosphate and AMD obtained from Munkyung coal mine, mole is the optimum dosage of tripolyphosphate for AMD treatment. concentration is decreased from 16.4 mg/ to 5.6 mg/, in other words, the removal rate of is 65.9%. concentration is decreased from 3.7 mg/ to 0.02 mg/, that is, the removal rate of is 99.5%. concentration ranges from 526.8 mg/ to 566.5 mg/, which shows no obvious decrease. After dosing up tripolyphosphate, concentration in AMD ranges from 549.8 mg/ to 599.3 mg/ and orthophosphate concentration in AMD ranges from 6.82 mg/ to 7.60 mg/. It was found that the precipitate in the order of amount is Apatite-tricalcium phosphate > from SEM, XRF, XRD analyses. Consequently, the treatment by tripolyphosphate is effective in pH buffering and in the removal of and .