[1]蘇俊濤,徐藝銘,孫愛麗,等.北方納污湖沉積物氮素釋放規(guī)律影響因素的研究[J].中國給水排水,2023,39(11):62-68.
SUJun-tao,XUYi-ming,SUNAi-li,et al.Influencing Factors of Nitrogen Release from Sediments of Polluted Lake in the North[J].China Water & Wastewater,2023,39(11):62-68.
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SUJun-tao,XUYi-ming,SUNAi-li,et al.Influencing Factors of Nitrogen Release from Sediments of Polluted Lake in the North[J].China Water & Wastewater,2023,39(11):62-68.
北方納污湖沉積物氮素釋放規(guī)律影響因素的研究
中國給水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第39卷 期數(shù): 2023年第11期 頁碼: 62-68 欄目: 出版日期: 2023-06-01
- Title:
- Influencing Factors of Nitrogen Release from Sediments of Polluted Lake in the North
- 關(guān)鍵詞:
- 沉積物氮素釋放; 氮素遷移轉(zhuǎn)化; 響應(yīng)面法; 環(huán)境因子
- Keywords:
- nitrogen release from sediment; nitrogen migration and transformation; response surface method; environmental factor
- 摘要:
- 為探究北方湖泊沉積物氮素釋放規(guī)律，預(yù)測內(nèi)源氮素釋放風(fēng)險，基于實際湖內(nèi)水體指標(biāo)探究溫度、pH和溶解氧與上覆水中氮素的相關(guān)性。采用響應(yīng)面法考察不同環(huán)境因子之間交互作用對總氮釋放速率的影響，通過構(gòu)建多項式回歸模型估算沉積物總氮年均釋放量，并預(yù)測最不利氮素釋放的因子水平。結(jié)果表明：溫度、pH、溶解氧與水體中氮素濃度顯著相關(guān)，其中pH、溶解氧對氮素釋放速率的影響更加明顯，溶解氧和pH的交互作用以及溶解氧和溫度的交互作用對總氮釋放速率的影響顯著。通過響應(yīng)面擬合模型計算得出納污湖沉積物的總氮年平均釋放量為0.35 t；最不利于沉積物氮素釋放的環(huán)境條件為4 ℃、溶解氧為5 mg/L、pH為9，此時預(yù)測氮素平均釋放速率為33.565 mg/（m2·d），與實測值誤差小于5%，說明模型可信度較高。控制水體pH、溶解氧是限制沉積物氮素釋放的有力手段。
- Abstract:
- 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/(m2·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.
更新日期/Last Update: 2023-06-01
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