B,As, and F contamination of river water due to wastewater discharge of the Yangbajing geothermal power plant,Tibet, China |
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| Authors: | Qinghai Guo Yanxin Wang Wei Liu |
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| Institution: | (1) School of Environmental Studies & Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, 430074 Wuhan, Hubei, People’s Republic of China;(2) Geo-environmental Monitoring Institute of Tibet Autonomous Region, 850000 Lhasa, Tibet, People’s Republic of China |
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| Abstract: | Thermal waters from the Yangbajing geothermal field, Tibet, contain high concentrations of B, As, and F, up to 119, 5.7 and
19.6 mg/L, respectively. In this paper, the distribution of B, As, and F in the aquatic environment at Yangbajing was surveyed.
The results show that most river water samples collected downstream of the Zangbo River have comparatively higher concentrations
of B, As, and F (up to 3.82, 0.27 and 1.85 mg/L, respectively), indicating that the wastewater discharge of the geothermal
power plant at Yangbajing has resulted in B, As, and F contamination in the river. Although the concentrations of B, As, and
F of the Zangbo river waters decline downstream of the wastewater discharge site due to dilution effect and sorption onto
bottom sediments, the sample from the conjunction of the Zangbo River and the Yangbajing River has higher contents of B, As,
and F as compared with their predicted values obtained using our regression analysis models. The differences between actual
and calculated contents of B, As, and F can be attributed to the contribution from upstream of the Yangbajing River. Water
quality deterioration of the river has induced health problems among dwellers living in and downstream of Yangbajing. Effective
measures, such as decontamination of wastewater and reinjection into the geothermal field, should be taken to protect the
environment at Yangbajing. |
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| Keywords: | Boron Arsenic Fluorine Geothermal waters Environmental impact Tibet |
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