生物活性炭长期运行的水质变化特征

作者：董秉直秦潇李甜杜嘉丹王嘉莹蒋福春张雪

单位：同济大学长江环境教育部重点实验室同济大学环境科学与工程学院中国城市规划设计研究院苏州市自来水有限公司

摘要：考察以太湖为原水的生物活性炭出水水质的长期变化。研究表明，出水的BDOC最低时，可作为生物活性炭进入生物膜阶段的水质表征。在生物膜阶段，吸附和生物降解共同发挥去除有机物的作用，BDOC和NBDOC的去除一直呈下降趋势。生物活性炭运行5～6年后，仅依靠生物膜降解有机物，吸附作用完全消失，此时去除30%的进水BDOC以及10%的小分子有机物。荧光响应的有机物主要依靠活性炭的吸附去除。活性炭对亲水性有机物的去除增强，而对疏水性有机物去除减弱。进一步提出了描述生物活性炭出水水质变化的数学模拟公式。

关键词：饮用水处理深度处理工艺生物活性炭有机物

作者简介：董秉直，男，同济大学环境科学与工程学院教授，博士生导师。主要研究方向为饮用水处理理论与技术。
基金：国家水体污染控制与治理科技重大专项（2017ZX07201001）

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Variation of water quality of biological activated carbon for a long times operation

DONG Bingzhi QIN Xiao LI Tian DU Jiadan WANG Jiaying JIANG Fuchun ZHANG Xue

(Key Laboratory of Yangtze River Water Environment,Ministry of Education,Tongji University School of Environmental Science and Engineering,Tongji University China academy of Urban Planning &Design Suzhou Water Compary)

Abstract: The variation of water quality in the effluent of biological activated carbon(BAC)in advanced treatment process used Taihu Lake as raw water for a long time was evaluated.The investigation showed that BDOC in effluent can be used as a parameter for indicating running of BAC at bio membrane stage.In running at bio membrane stage,both adsorption and biological degradation remove organic matter and removal efficiency of BDOC and NBDOC decrease.After running for 5～6 years,organics was removed by bio membrane only and the adsorption effect disappeared completely.In this stage,BAC remove about 30%of BDOC in feed,being equal to 10% of small molecular weight.The organics with fluorescence response was removed mainly by adsorption.BAC running with time increase hydrophilic organics removal but decrease hydrophobic organics removal.A mathematic fitting formula for describing the variation of water quality in effluent of BAC was proposed.

Keywords: Drinking water treatment; Advanced treatment process; Biological activated carbon; Organic matter;

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