Effect of in-situ physical elution technology on release features of nitrogen and phosphorus in the sediment of Liangshui river
LI Guohong1,2,, YE Bibi1,2, WU Jingdong3, CHU Zhaosheng1,2,,, HOU Zeying1,2, SUN Jin3, DU Haiming3, ZHOU Ao3 1.National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing 100012, China 2.Institute of Lake Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China 3.Anhui Lake Environment Technology Co. Ltd., Hefei 230041, China
Abstract:In this study, a new in-situ remediation technology-in-situ physical elution technology was used to conduct the inhibition experiments on nitrogen and phosphorus release from the sediment of Liangshui River. The in-situ samples before and after elution were collected, then the lab static simulation tests were also designed. Variation characteristics of contents and release rate of ${\rm{NH}}_4^ + $-N, ${\rm{NO}}_3^ - $-N, TN, ${\rm{PO}}_4^{3 - }$-P, TP in the overlying water of the elution group and control group were analyzed. The results were showed that for the elution group, the average ${\rm{NH}}_4^ + $-N release rate from sediment to the overlying water was (?6.51±0.32) mg·(m2·d)?1 on the 30th day of the release test, and the average ${\rm{NH}}_4^ + $-N concentration in the overlying water reached 0.52 mg·L?1, which decreased by 89.4% compared to the control group. The average ${\rm{PO}}_4^{3 - }$-P and TP release rates decreased by 78.1% and 83.0% compared to the control group, respectively. The average TP concentration in the overlying water reached 0.22 mg·L?1, which was 68.1% lower than the control group. The inhibition of ${\rm{NH}}_4^ + $-N and ${\rm{PO}}_4^{3 - }$-P release from the sediment by in-situ physical elution technology is mainly realized through the reduction of organic nitrogen and phosphorus substances and the amelioration of reducing environments in water-sediment interface. Key words:in-situ physical elution/ sediment remediation/ Liangshui river/ nitrogen and phosphorus release.
图1底泥中各种形态磷提取步骤 Figure1.Extraction process of phosphorus forms in sediment
图5对照组和洗脱组${{\bf{PO}}_4^{3 - }}$-P释放速率及浓度的变化(n=4) Figure5.Changes in ${{\rm{PO}}_4^{3 - }}$-P release rate and concentration in control and test groups (n=4)
表1对照组与洗脱组表层底泥各项理化指标(n=4) Table1.Physical & chemical indexes of surface sediment in control and test groups
实验组
pH
ORP/mV
w(OM)/%
w(TN)/(mg·kg?1)
w(TP)/(mg·kg?1)
对照组
7.24±0.15
?132.7±19.2
3.61±1.26a
3 272.4±1 249.2a
2 671.9±926.4a
洗脱组
7.43±0.18
?96.0±38.0
2.18±0.25b
700.5±298.0b
1 472.2±682.9b
注：不同字母代表差异的显著性，下同。
实验组
pH
ORP/mV
w(OM)/%
w(TN)/(mg·kg?1)
w(TP)/(mg·kg?1)
对照组
7.24±0.15
?132.7±19.2
3.61±1.26a
3 272.4±1 249.2a
2 671.9±926.4a
洗脱组
7.43±0.18
?96.0±38.0
2.18±0.25b
700.5±298.0b
1 472.2±682.9b
注：不同字母代表差异的显著性，下同。
下载: 导出CSV 表2释放期间氮、磷释放速率与环境因子的Spearman相关矩阵(n=69) Table2.Spearman matrix between nitrogen & phosphorus release rate and environmental factors during test (n=69)
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1.National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing 100012, China 2.Institute of Lake Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China 3.Anhui Lake Environment Technology Co. Ltd., Hefei 230041, China Received Date: 2019-04-23 Accepted Date: 2019-08-20 Available Online: 2020-03-25 Keywords:in-situ physical elution/ sediment remediation/ Liangshui river/ nitrogen and phosphorus release Abstract:In this study, a new in-situ remediation technology-in-situ physical elution technology was used to conduct the inhibition experiments on nitrogen and phosphorus release from the sediment of Liangshui River. The in-situ samples before and after elution were collected, then the lab static simulation tests were also designed. Variation characteristics of contents and release rate of ${\rm{NH}}_4^ + $-N, ${\rm{NO}}_3^ - $-N, TN, ${\rm{PO}}_4^{3 - }$-P, TP in the overlying water of the elution group and control group were analyzed. The results were showed that for the elution group, the average ${\rm{NH}}_4^ + $-N release rate from sediment to the overlying water was (?6.51±0.32) mg·(m2·d)?1 on the 30th day of the release test, and the average ${\rm{NH}}_4^ + $-N concentration in the overlying water reached 0.52 mg·L?1, which decreased by 89.4% compared to the control group. The average ${\rm{PO}}_4^{3 - }$-P and TP release rates decreased by 78.1% and 83.0% compared to the control group, respectively. The average TP concentration in the overlying water reached 0.22 mg·L?1, which was 68.1% lower than the control group. The inhibition of ${\rm{NH}}_4^ + $-N and ${\rm{PO}}_4^{3 - }$-P release from the sediment by in-situ physical elution technology is mainly realized through the reduction of organic nitrogen and phosphorus substances and the amelioration of reducing environments in water-sediment interface.
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