Assessment of the impact of industrial effluents on water quality in Patancheru and environs, Medak district, Andhra Pradesh, India

摘要

The effects of multiple industrial-pollutant sources on the groundwater system were evaluated in the Industrial Development Areas (IDAs) of Medak district, Andhra Pradesh (AP), India. The quality of groundwater in the region has been affected negatively due to the discharge of effluents on open land and into ponds, tanks, and streams. Water samples from surface-water bodies, dug wells, and bore wells were analyzed for their major ion concentrations. The high values of electrical conductivity (EC) and concentrations of Na~+, Ca~(2+), Cl~-, and HCO_3~- indicate the impact of industrial effluents. Based on the hydrochemistry, the groundwater is classified into various types, such as sodium-chloride, sodium-bicarbonate, calcium-chloride, and magnesium-chloride, and its suitability for drinking and irrigation has been assessed. The present studies made it possible to demarcate areas of contaminated groundwater and those prone to contamination in the near future. Water in the area has deteriorated all along Nakka Vagu up to a maximum distance of 500-700 m from the eastern bank. The groundwater quality in and around Patancheru (to a depth of 30 m) has become hazardous. Some possible remedial measures are suggested.