藻源型有机质（AOM）的氯消毒生物稳定性及其机理研究

Algogenic organic matter (AOM)is a group of cell organic matter generated during the algae growth phases.AOM is quite different from natural organic matter(NOM),containing extracellular organic matter(EOM) and intracellular organic matter(IOM). AOM is is rich in assimilable organic carbon (AOC) including glycolic acid, amino acids and polysaccharides, and is likely to cause biological instability in drinking water. AOC in AOM is difficult to remove. Its concentration, on the other way,would increase during chlorine disinfection. The formation of AOC during chlorination increases the risk that the drinking water will become biologically unstable.The study of AOC formation mechanisms during the chlorination of AOM is of great significance to control the biological stability of the drinking water. This study is to develop mathematical model to investigate the environmental facters on AOC values in EOM and IOM. This study also commits to analysing the kinetic mechanics of AOC formation during chlorination, screening the key control factors.The key EOM and IOM precursors that are easily oxidized to AOC are to be indentified. A better understanding of the formation pathway of AOC from both EOM and IOM will be helpful for the development of proper control approaches that can be used to enhance the biological stability of high algae-laden water.

藻源型有机质（AOM）是藻类生长过程中合成的细胞有机质，包含胞外有机质（EOM）和胞内有机质（IOM），AOM与天然有机质(NOM)理化生特性区别显著，且富含乙醇酸、氨基酸、多糖等生物可同化有机碳（AOC），影响饮用水生物稳定性；AOM中的AOC不易被去除，反而会在氯消毒过程中增加，即氯消毒会导致新的AOC生成，进一步增加出水的生物风险。研究AOM氯消毒过程AOC的生成机制对提高富营养化水源饮用水生物稳定性的意义重大，国内外鲜见相关研究报道。本课题拟研究水体环境因素对EOM和IOM中AOC含量的影响，并建立多因素综合预测模型；对比研究EOM和IOM在氯消毒中的AOC生成动力学机制，筛选关键控制因素；辨析EOM和IOM中易被氯化生成AOC的关键前体物并推演生成路径；差异性分析EOM和IOM对氯消毒过程中AOC生成的贡献机制，为高藻水EOM和IOM释放后饮用水生物稳定性的保障提供理论支撑。

藻源型有机质（AOM）与天然有机质(NOM)理化生特性区别显著，且富含氨基酸、多糖等能被微生物高效利用的有机物，影响饮用水生物稳定性，此外，有研究表明氯消毒会增加出水的生物风险。本课题对两种典型藻类（微囊藻和小球藻）中胞外有机质（EOM）和胞内有机质（IOM）亲疏水组分进行了分离，对其理化特性进行了系统表征。 . 结果表明，微囊藻产生的高分子生物聚合物远多于小球藻，微囊藻中富含藻蓝蛋白等有机物，而小球藻的小分子有机物含量高。表明不同类型藻类所产生的有机质存在显著差别，进而影响后续处理工艺和参数的遴选。此外，对比研究了两种藻不同EOM和IOM组分中生物可同化有机碳（AOC）和生物可降解有机碳（BDOC）的组成规律，并考察了氯消毒对其生物稳定性的影响。结果表明上述两种藻IOM中BDOC/DOC比例较高（约为55%-65%），AOC在IOM和EOM中的分布基本持平（AOC/DOC约20%-25%）；加氯消毒后，AOC和BDOC均有明显下降，特别是BDOC的下降超过50%，主要可能与高毒性氯消毒副产物的生成有关。相关机制正在进一步研究和探索。