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比较不同孔径超滤膜截留混凝沉淀出水和砂滤出水的三卤甲烷(THMs)前体物效果。水样经0.45μm膜过滤后加氯消毒,光谱扫描分析溶解性有机碳(DOC)分子比例和THMs前体物化学结构变化,采用气相色谱-质谱法测定THMs生成潜能。结果表明:200nm、100nm、30nm和10nm超滤膜对混凝沉淀出水THMs前体物平均去除率分别为10.92%、11.18%、34.27%和53.38%,而对砂滤池出水THMs前体物平均去除率分别为7.80%、13.28%、22.31%和48.68%。光谱扫描表明羰基、烯烃、炔烃、不饱和烃、共轭烯烃以及苯及其衍生物结构普遍存在于DOC化学结构中,THMs前体物来源于它们的贡献。DOC中大分子的THMs生成潜能和活性强,小分子的生成THMs潜能和活性弱。
The effect of THMs precursors on coagulation and sedimentation effluent and sand filtration of different pore size ultrafiltration membranes was compared. Water samples were filtered through 0.45μm membrane and chlorinated. The molecular ratio of dissolved organic carbon (DOC) and the chemical structure of THMs precursors were analyzed by spectral scanning. The potential of THMs was determined by gas chromatography-mass spectrometry. The results showed that the average removal rates of THMs precursors from coagulation sedimentation were 10.92%, 11.18%, 34.27% and 53.38% respectively for 200nm, 100nm, 30nm and 10nm ultrafiltration membranes. However, The removal rates were 7.80%, 13.28%, 22.31% and 48.68% respectively. Spectral scans indicate that the carbonyl, olefin, alkyne, unsaturated hydrocarbon, conjugated olefin, and benzene and their derivatives are prevalent in the DOC chemical structure and THMs precursors are derived from their contribution. The THMs of DOC have strong potential and activity to generate THMs, and the potential and activity of THMs to generate small molecules are weak.