Study on Release Potential of Heavy Metals in Sediments from Baihua Lake by Dredging Simulation

Abstract:

Baihua Lake is a key drinking water source for Guiyang City located on Guizhou Plateau in southwest China, however it has been seriously contaminated with various contaminants, such as nitrogen, phosphorus, and heavy metals. To solve this problem, some researchers have recommended dredging the lake sediment to remove these contaminants. The present research was aimed to assess the potential risk of five selected heavy metals (Cd, Cu, Cr, Hg and As) if the sediment dredging measure was taken for remediation of this water body. Core sediments collected from the site Guanyinshanzhuang were used to simulate the release of heavy metals in sediment from Baihua Lake if sediment dredging was carried out. The core sediments were dredged at 10 cm, 20 cm and 30 cm levels. The core sediments were then put into the lake again after simulation dredging to investigate their release potential in one day, five days, nine days and fifteen days. The mobility of selected heavy metals in the sediments were determined using the toxicity characteristic leaching procedure (TCLP) developed by the United States Environmental Protection Agency (USEPA). The results indicated that the release potential of the heavy metals varies with dredging depth and the lasting time after dredging. Cr and As showed the lowest release ability among the heavy metals under study followed by Cu. The release amount of Cd increased with the lasting time after dredging. Hg showed no clear trends of release at 10 cm dredging depth. At 20 cm and 30 cm dredging depth, Hg presented a small release in the five days after simulation dredging, and then no release in the following ten days. In fifteen days after simulation dredging, the percentages of the heavy metals extracted with TCLP were in the order of Cd (8.85%) > As (3.41%) > Cu (1.37%) > Hg (0.79%) > Cr (0.61%) at dredging depth of 10 cm, Cd (10.22%) > Hg (2.73%) > Cu (1.74%) >As (1.47%)> Cr (1.41%) at dredging depth of 20 cm, and Cd (10.38%) > As (2.07%) > Hg (2.51%) > Cu (1.74%) > Cr (0.87%) at dredging depth of 30 cm.

• Periodical: Advanced Materials Research (Volume 878)
• Pages: 545-550
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.878.545
• Online since: January 2014
• Authors: Yi Wang, Xian Fei Huang, Ji Wei Hu
• Keywords: Baihua Lake, Dredging Simulation, Release Potential, Sediment

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