【摘要】 通过模拟实验研究了生物膜胞外聚合物（EPS）和乙二胺四乙酸（EDTA） 2种典型溶解有机质（DOM）成分对自然水体生物膜体系中过氧化氢（H₂O₂）生成特征的影响,并研究了体系初始pH值、DOM浓度、溶解氧（DO）等因素的影响.结果表明,DOM的存在对自然水体生物膜体系中H₂O₂的生成有明显影响.光照能促使EPS产生H₂O₂,而EPS的存在对生物膜产生H₂O₂的直接影响不显著,EPS与生物膜共存体系中的H₂O₂由二者共同产生; EDTA本身不产生H₂O₂,且对H₂O₂分解影响很小,但会显著抑制生物膜产生H₂O₂,且浓度越高抑制作用越明显.体系pH值、DOM浓度和DO均能不同程度影响EPS产生H₂O₂及EDTA抑制生物膜产生H₂O₂的作用.更多还原

【Abstract】 The effects of dissolved organic matter（ DOM） on the generation characteristics of hydrogen peroxide（ H₂O₂） in natural biofilm systems were studied. The biofilm extracellular polymeric substances（ EPS）and ethylenediamine tetraacetic acid（ EDTA） were chosen as two typical DOM components. The results show that the presence of DOM has significant influences on the generation of H₂O₂. Illumination can promote EPS to produce H₂O₂ and EPS has no significant direct influences on generation of H₂O₂ by biofilms. H₂O₂ in the coexistence system is produced by both EPS and biofilms. EDTA doesn’t produce H₂O₂ itself and has little influence on decomposition of H₂O₂,while showing significantly inhibition correlating to EDTA concentrations positively on the generation of H₂O₂ by biofilms. The pH value,DOM concentration and dissolved oxygen（ DO） of the systems can varyingly affect the generation of H₂O₂ by EPS and the inhibition of EDTA on the generation of H₂O₂ in biofilms. Therefore,DOM has influences on both the generation of H₂O₂ in biofilms and the concentration of H₂O₂ in water environment,and the influences of different DOM components with different structures and properties may be significantly different.更多还原