• 关键词：天然有机物  光散射颗粒分析仪  在线监测  吸附电中和  卷扫絮凝

• 基金项目：国家自然科学基金国际合作项目(50010130460)

• 王晓昌
• 西安建筑科技大学环境与市政工程学院, 西安 710055

• 金鹏康
• 西安建筑科技大学环境与市政工程学院, 西安 710055

• 周兰
• 西安建筑科技大学环境与市政工程学院, 西安 710055

• 摘要：以腐殖酸为去除对象,用光散射颗粒分析仪(PDA)对水中天然有机物的混凝过程进行在线监测,结果表明PDA输出信号(FI曲线)的特征值与絮凝体粒径和有机物去除率之间具有相关性.在弱酸性(pH=5.0)和中性(pH=7.0)条件下,通过合理控制混凝剂投量,腐殖酸的TOC去除率可达5.0%,UV2.54去除率可达80%—90%,但pH=7.0时的投量为pH=50的5倍以上.在pH=5.0的条件下,吸附电中和是有机物混凝的主要机理,但在混凝剂投量非常高的情况下,卷扫絮凝也起重要作用.在pH=7.0条件下,卷扫絮凝则是有机物混凝的主要机理.

• Abstract：Using a photometric dispersion analyzer (PDA), online monitoring and control of coagulation process was realized for the removal of aquatic organic matter. A correlative relationship was found among the PDA output (FI curve), floc size and TOC removal. At slightly acidic (pH=5.0) and neutral (pH=7.0) conditions, a TOC removal of 50% and UV₂₅₄ removal of 80%—90% can be achieved under optimum alum dosages, but the required Al dose at pH 7 is about 5 times of that at pH 5. At pH 5.0, adsorption and charge-neutralization is thought to be the main mechanism of coagulation for aquatic organic matter at moderate Al dose but sweep coagulation is the main mechanism at pH 7.0 as well as at pH 5.0 under an overdosing condition.

• Key words：aquatic organic matter  photometric dispersion analyzer  online monitoring  adsorption and chargeneutralization  sweep coagulation

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