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Seasonal variation of potential denitrification rate and enhanced denitrification performance via water-lifting aeration technology in a stratified reservoir-A case study of Zhoucun reservoir

机译:分层水库增水曝气技术潜在反硝化率的季节性变化及反硝化性能的增强-以周村水库为例

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Zhoucun reservoir is one of the major water resources in Zao Zhuang city, northern China. The seasonal distribution of surface sediment denitrification rate and enhanced performance of denitrification via water-lifting aeration technology were explored using the acetylene-inhibition technique. Surface sediment denitrification rates ranged from 2.57 +/- 1.32 to 923.90 +/- 86.81 nmol N-2/(g dw.h), with the highest rates in November (ANOVA, p 0.05) and significantly low rates in June, July, and August (ANOVA, p 0.05), mainly because of the seasonal differences in nitrate concentration, water temperature, and sediment total nitrogen (STN). Meanwhile, the N-2/(N-2+N2O) ratio (83.44-91.70% for the highest sediment denitrification period) indicated that N-2 accounted for a majority of denitrification. Correlation analysis between various environmental factors and denitrification was conducted, and nitrate concentration, STN, low molecular weight organic carbon, the number of aerobic denitrifying bacteria, and the environmental parameters of oxidation-reduction potential (ORP), pH, electrical conductivity (EC), and chlorophyll a (Chl-a) presented significant relationships during the entire study period. On the basis of the multiple regression model, nitrate and low molecular weight organic carbon concentration were the most influential factors on denitrification variability. Moreover, the denitrification rates of the surface sediment clearly increased, from 5.28 to 13.22 nmol N-2/(g dw.h) to 1117.02 3129.47 nmol N-2/(g dw.h), which were higher than those in the non-operating year. This suggests that the denitrification in the sediment system could be enhanced in situ by water-lifting and aeration technology in the reservoir ecosystem. (C) 2018 Elsevier Ltd. All rights reserved.
机译:周村水库是中国北方枣庄市的主要水资源之一。利用乙炔缓蚀技术,研究了地表沉积物反硝化率的季节分布和提水曝气技术提高反硝化性能。表层沉积物反硝化率范围从2.57 +/- 1.32到923.90 +/- 86.81 nmol N-2 /(g dw.h),其中11月的最高反渗透率(ANOVA,p <0.05)和6月,7月的反渗透率非常低和8月(ANOVA,p <0.05),主要是由于硝酸盐浓度,水温和沉积物总氮(STN)的季节差异。同时,N-2 /(N-2 + N2O)比率(最高的沉积物反硝化期为83.44-91.70%)表明,N-2占了大部分反硝化作用。进行了各种环境因素与反硝化之间的相关性分析,硝酸盐浓度,STN,低分子量有机碳,好氧反硝化细菌的数目以及氧化还原电位(ORP),pH,电导率(EC)的环境参数,而叶绿素a(Chl-a)在整个研究期间呈现出显着的关系。在多元回归模型的基础上,硝酸盐和低分子量有机碳浓度是影响反硝化变异性的最主要因素。此外,表层沉积物的反硝化率明显增加,从5.28 nmol N-2 /(g dw.h)增至1117.02 3129.47 nmol N-2 /(g dw.h),高于非沉积物的反硝化率。营业年。这表明,通过水库生态系统中的注水和曝气技术可以原位增强沉积物系统中的反硝化作用。 (C)2018 Elsevier Ltd.保留所有权利。

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