YIN Xin-ya1,2 , TAO Fa-xiang 1
(1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;
2.Graduate University of the Chinese Academy of Sciences, Beijing 100049, China)
Abstract: Rivers flowing through cities have been increasingly contaminated due to the discharges of sewage water contributed by domestic, commercial and industrial activities. Construction of interception sewers is a major measure to separate rain water from waste water. In order to evaluate the efficiency of sewage interception, we collected water samples across eight sections in the downtown part of the Nanming River in Guiyang in October, 2008, and January, April and July, 2009. These samples were analyzed for major ions (K+, Na+, Ca2+, Mg2+, Cl-, NO3-, SO42-, HCO3-) while temperature (T), pH, electric conductivity (EC) and dissolved oxygen (DO) were determined in site. EC and major ions showed significant increases. These increases cannot be attributed to the confluence of tributaries, but to human activities. That implies three possibilities: incompleteness of sewage interception, leakage of interception sewers and existence of some non-point pollution sources. This work indicates that hydrochemical analysis may be a simple method to evaluate the efficiency of interception projects.
Key words: urbanization; hydrochemistry; interception sewer; Nanming River
EARTH AND ENVIRONMENT Vol. 40, No.4, Tot No.290, 2012, Page 517-523
