wAbstract
@Due to a humid climate, karst areas in south China have an abundance
of groundwater. With the development of agriculture, industry,
and mining, the potential factors that may result in catastrophic
groundwater pollutions are increasing. A phosphorus groundwater
pollution event and its subsequent emergency treatment at Penshuidong
Cave in Songming, Yunnan Province on February 24, 2998 were analyzed
in addition to water quality monitoring in the region. The results
showed that concentrations of phosphates, fluoride, cyanides and
volatile phenols in phosphorus sludge waste liquid to be 11,532,
252, 224, 200 times higher than that of the Environmental quality
standards for surface water (GB 3838-2002) III, respectively.
The element phosphorus concentration was 16,510 times higher than
the limit set by the Water quality standard for fisheries (GB
11607-1989). The addition of quicklime and water to the phosphorus
sludge waste liquid dumping pit clearly decreased pollutant concentrations,
which indicates that the quicklime can remove the phosphorus from
the waste liquid. Peak values of pollutant concentration decreased
along the flow direction, which suggests the highly concentrated
polluted water mass may be diluted during its movement. After
treatment with water, a pollutant concentration peak appears at
the groundwater outlet indicating that washing may accelerate
the moving speed of the pollutants in groundwater. Element phosphorus
concentrations, however, remained at a high and stable range (46-65
times higher than the limit set by the Water quality standard
for fisheries).
Keywords: Groundwater pollution; Karst; Phosphorus sludge waste
liquid; Water quality monitoring; Songming County Yunnan Provincex
Introduction
Background for the phosphorus sludge waste liquid pollution incident
at Penshuidong Cave in Songming County
@General geography of the incident site
@The loss and influence caused by the accident
@The pollution procedures
@Emergency reaction to the pollution accident
Water quality monitoring in the contaminated area
@Pollutant monitoring
@Water quality changes at the fishpond water inlet
@Water quality changes along flow direction
Discussion and concluding remarks
Acknowledgments
References