PROPERTIES,CHARACTERIZATION METHODS,AND ENVIRONMENTAL IMPACTS OF DISSOLVED ORGANIC MATTER IN AQUATIC SYSTEMS
Dissolved organic matter(DOM)pervades natural aquatic environments as the primary constituent of aqueous organic matter.It plays intricate roles in environmental and ecological feedback mechanisms,closely linked to the growth and metabolism of microorganisms.In the natural ecological cycle,rivers function as conveyors for various sources and sinks,with the ocean serving as the ultimate receptor.This paper employs statistical analysis to summarize the nature and distribution of DOM across water bodies in wastewater-sewage-river/lake-ocean environments,highlighting the various functional aspects of DOM,including biological primary productivity,energy supply,photosynthetic effect,chemical regulation,trace metal transport,carbon sink,and its impact on human health.DOM has a complex composition,comprising polysaccharides,proteins,humus,lipids,small molecular organic acids,etc.The natural pathways for DOM formation involve the degradation of macromolecular organic matter,animal and microbial metabolism,plant root secretion,and the decline process of plant growth.These pathways are influenced by geographic,environmental,and climatic factors.Human-induced introduction of DOM into water sources,particularly sourced from residual organic pollutants in wastewater treatment plant effluents,also should not be overlooked.The transformation and fate of DOM have significant effects on both the effluent quality of drinking water plants and the microbial community structure in natural water bodies.Therefore,accurate and comprehensive qualitative and quantitative analysis of DOM is imperative.In this regard,this paper systematically outlines the analysis principles,application objects,and technical characteristics of DOM studies,and proposes the necessity to develop collaborative and dynamic analytical methodologies in measurement technology,identification and characterization,generation mechanism,multiphase chemistry,and ecological health analysis.Last but not least,the environmental impact of the DOM concentration gradient is discussed through the comparison of various sources such as natural water bodies,urban sewage,industrial wastewater,anaerobic fermentation,and leachate,emphasizing the scientific significance of ecological sustainability and balance mechanisms at the elemental level.This paper endeavors to propose that ongoing research should focus on the elemental driving mechanisms of DOM,ecological regulatory mechanisms,and information flux analysis.
dissolved organic matter(DOM)natural water bodydrinking waterwastewater treatmentleachateanalytical methodsenvironmental effectsecological health
万方数据
维普
