江淮水利科技Issue(6)：21-28,8.DOI:10.20011/j.cnki.JHWR.202506004
基于DOM调控的河道氨氮次氯酸钠净化机制与策略研究
Study on the mechanism and strategy of sodium hypochlorite purification of ammonia nitrogen in rivers based on dissolved organic matter(DOM)regulation
摘要
Abstract
To address the issues of uncertain efficiency and ecological safety risks encountered when using the sodium hypochlorite(NaClO)oxidation method to treat ammonia nitrogen in complex,open urban river waters,this paper took the river system of Fuyang urban area as the research object and conducted a systematic investigation through laboratory simulations and in situ river experiments.Laboratory simulation results indicated that the unit degradation ratio of ammonia nitrogen was significantly influenced by the background organic load of the river,with values increasing in the order of the Cecal segment(6.40),Meiyuan segment(7.25),and Beijing road bridge segment(12.00).This trend showed a positive correlation with the content and composition of DOM,as characterized by the three-dimensional fluorescence characteristics of the water body,revealing the competitive consumption mechanism of DOM for oxidants.When the ammonia nitrogen concentration was not more than 4.0 mg/L,the residual chlorine generated by the reaction dissipated rapidly.However,when the ammonia nitrogen concentration was not less than 5.0 mg/L,the residual chlorine concentration increased,and its half-life significantly prolonged,necessitating regulation strategies based on the biological activity zoning of the water body.In-situ river experiments demonstrated a significant reduction in ammonia nitrogen(0.3～0.5 mg/L)within 6 hours after sodium hypochlorite dosing,with residual chlorine decaying to less than the safe threshold after 24 hours,with on-site qualitative observations indicating no significant impacted on fish survival.Based on pollutant characteristics and ecological responses,this paper innovatively proposed three customized sodium hypochlorite dosing schemes,optimizing the synergistic regulation of ammonia nitrogen removal efficiency and ecological safety,thereby providing reliable technical support for the precise management of urban rivers.关键词
次氯酸钠/氨氮/净化水质/余氯衰减/城市河道Key words
sodium hypochlorite/ammonia nitrogen/purify water quality/residual chlorine attenuation/urban river course分类
资源环境引用本文复制引用
聂菊仙,卢庆根,崔健,程庆庆,张勇,张爱勇..基于DOM调控的河道氨氮次氯酸钠净化机制与策略研究[J].江淮水利科技,2025,(6):21-28,8.基金项目
安徽省自然科学基金水科学联合基金(2408055US005) （2408055US005）
