Removal of organic matter in micro-polluted raw water using enhanced coagulation with diatomite
硅藻土强化混凝去除微污染原水中的有机物

The removal of dissolved organic matter (DOM) from the slightly polluted surface water by the combination of PAC and diatomite was investigated. The DOM from raw river was fractionated and characterized by resin adsorption (RA) and ultrafiltration (UF) techniques. The physical distribution of the DOM is that the fraction with molecular weight below 4 kDa is more than 50%. The results showed that the molecular weight below 4 kDa was the main DOM in the water sample. The chemical fractions distribution of the DOM is that the hydrophobic acids (HoA) and the hydrophilic matter (HiM) are richer than others. The combination of PAC and diatomite removed DOM, the DOC removal rate was improved from 22.5% to 26.3 % with 30 mg/L PAC combining 0.5 g/L diatomite.