The slightly-polluted river water was purified by infiltration through the different thickness medium, which is considered as the constructed rapid infiltration treatment system, of volcanic rock, coarse sand, ore sand and various diameters of gravels. The results show that the effluent concentrations of NH3-N, TN, TP and Chlorophyll were less than 0.05 mg/L, 1mg/L, 0.1 mg/L and 2 mg/L respectively and CODCr ranged from 15 mg/L to 40 mg/L after the infiltration of coarse sand. Moreover, the effluent concent...
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