北方纳污湖沉积物氮素释放规律影响因素的研究  

Influencing Factors of Nitrogen Release from Sediments of Polluted Lake in the North

作　　者：苏俊涛 徐艺铭 孙爱丽 石家萱 董禹含 杨基先 SU Jun‑tao;XU Yi‑ming;SUN Ai‑li;SHI Jia‑xuan;DONG Yu‑han;YANG Ji‑xian(Jilin Branch,China Kunlun Contracting&Engineering Corporation,Jilin 132002,China;School of Environment,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]中国昆仑工程有限公司吉林分公司,吉林吉林132002 [2]哈尔滨工业大学环境学院,黑龙江哈尔滨150090

出　　处：《中国给水排水》2023年第11期62-68,共7页China Water & Wastewater

基　　金：安全环保工程关键/成套技术研究项目(2019ZYGC-06-02-01)。

摘　　要：为探究北方湖泊沉积物氮素释放规律,预测内源氮素释放风险,基于实际湖内水体指标探究温度、pH和溶解氧与上覆水中氮素的相关性。采用响应面法考察不同环境因子之间交互作用对总氮释放速率的影响,通过构建多项式回归模型估算沉积物总氮年均释放量,并预测最不利氮素释放的因子水平。结果表明:温度、pH、溶解氧与水体中氮素浓度显著相关,其中pH、溶解氧对氮素释放速率的影响更加明显,溶解氧和pH的交互作用以及溶解氧和温度的交互作用对总氮释放速率的影响显著。通过响应面拟合模型计算得出纳污湖沉积物的总氮年平均释放量为0.35 t;最不利于沉积物氮素释放的环境条件为4℃、溶解氧为5 mg/L、pH为9,此时预测氮素平均释放速率为33.565 mg/(m^(2)·d),与实测值误差小于5%,说明模型可信度较高。控制水体pH、溶解氧是限制沉积物氮素释放的有力手段。To explore the rule of nitrogen release from sediments in lakes in northern China and predict the risk of endogenous nitrogen release,the correlation between three factors(temperature,pH and dissolved oxygen)and nitrogen in overlying water was explored based on actual water indicators of the lake.The response surface method was used to investigate the effects of interaction between different environmental factors on the total nitrogen release rate.Multiple regressions were constructed to estimate the total annual nitrogen release from sediments and predict the most unfavorable nitrogen release factor levels.Temperature,pH and dissolved oxygen were significantly correlated with the nitrogen concentration in water,among which the pH and dissolved oxygen had more significant effects on nitrogen release rate.The interaction between dissolved oxygen and pH as well as the interaction between dissolved oxygen and temperature had a significant effect on the total nitrogen release rate.The average total annual nitrogen release from sediments in the polluted lake was 0.35 t calculated by the response surface fitting model.The most unfavorable environmental conditions for nitrogen release from the sediments were temperature of 4℃,dissolved oxygen of 5 mg/L and pH of 9.In this case,the predicted average nitrogen release rate was 33.565 mg/(m^(2)·d),and the error of the measured value was less than 5%,indicating that the model had a high reliability.Controlling water pH and dissolved oxygen was a powerful means to limit nitrogen release from sediments.

关 键 词：沉积物氮素释放 氮素迁移转化 响应面法 环境因子 

分 类 号：TU992[建筑科学—市政工程]