Study on determination of optimium chemical dose for wastewater treatment in Maokhe coal mine
Abstract
Coal mining wastewater has high acidity (pH 3 to 6) and high concentration of total suspended solids (TSS), iron (Fe), manganese (Mn).... For the quality of treated wastewater to ensure the requirements of QCVN 40:2011 as well as to continue treatment for the purpose of reuse, wastewater should be pre-treated by coagulation-sedimentation method. Studying on laboratory models (Jar-test), the dose of lime (CaO) needed to raise the pH from 3 to 8 are defined as 35 mg/L, then add chemical coagulants PAC with dose of 50 mg/L (dry season) and 30 mg/L (rainy season). The treatment technology of coal mining wastewater is proposed by step 1: flocculation - sedimentation to ensure a requirements of wastewater discharge; step 2: continuous treatment by sand filter for water use in coal dust suppression and step 3 by UF membrane filtration for drinking water supply.
Keywords: Coal mining wastewater; coagulation - sedimentation; dose of lime; PAC, jar-test.
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