KOUXiao-mei,WANGYi,WEIHai-shan,et al.Content and Forms Distribution Characteristics of Pollutants from Sediment in Areas Recharged by Different Water Sources[J].China Water & Wastewater,2023,39(23):98-103.
Click Copy

Content and Forms Distribution Characteristics of Pollutants from Sediment in Areas Recharged by Different Water Sources

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第39卷 Number: 第23期 Page: 98-103 Column: Date of publication: 2023-12-01
Author(s):
KOU　Xiao-mei1; 2;  WANG　Yi3;  WEI　Hai-shan3;  WU　Shi-zhang1; 2;  SHAO　Tian1; 2;  LIANG　Zhen-hao3
（1. PowerChina Northwest Engineering Corporation Limited， Xi’an 710065， China； 2. Shaanxi Union Research Center of University and Enterprise for River and Lake Ecosystems Protection and Restoration， Xi’an 710065， China； 3. School of Environmental and Municipal Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China）
Keywords:
sediment from the area recharged by reclaimed water;  sediment from the area recharged by surface water;  organic matter content;  nutrient content
Abstract:
This paper collected the sediment from areas recharged by different water sources of a landscape water body in Xi’an in different seasons, analyzed its organic carbon content and the composition and distribution of nutrients such as nitrogen and phosphorus, and evaluated the characteristics of sediment pollution. The annual mean TOC content in the sediment from the area recharged by reclaimed water (RWS) was 55.41 mg/g, which was approximately 1.55 times that of the sediment from the area recharged by surface water (SWS). The VS/TS ratio of RWS was significantly higher than that of SWS. The annual average contents of TN and TP in RWS were 21.77 mg/g and 5.35 mg/g, respectively, which were approximately 2.35 times and 1.97 times those of SWS. Meanwhile, the contents of the most active ion exchange nitrogen (IEF-N) and weakly adsorbed phosphorus (NH4Cl-P) in RWS were 0.71 mg/g and 0.22 mg/g, respectively, which were 2.45 times and 3.14 times those of SWS. In addition, the contents of reductive phosphorus (Fe-P) and organic phosphorus (NaOH-nrP) in RWS were 0.44 mg/g and 0.20 mg/g, respectively, which were 2.44 times and 1.54 times those of SWS. In conclusion, the contents of TOC, TN and TP in RWS were significantly higher than those in SWS, and the contents of “active” nitrogen and phosphorus in RWS were also significantly higher than those in SWS. Therefore, the risk of carbon, nitrogen and phosphorus release in landscape water recharged by reclaimed water was higher, especially in summer and autumn when the weather was high. It is thus suggested to effectively control the release of pollutants from the sediment of landscape water recharged by reclaimed water.
Last Update: 2023-12-01