Assessment of groundwater pollution sources in the urban environment (Case Study: Tehran Municipality of District 14)
Subject Areas : Water and Environment
Zahra Shirani
1
(M.Sc in Environment, Environment and Energy Department, Science and Research Branch, Islamic Azad
University ,Tehran, Iran.)
Majid Abbaspour
2
(Professor, Mechanical Faculty, Sharif University, Tehran, Iran.)
AmirHossein Javid
3
(Associate Professor, Science and Technology Faculty, Science and Research Campus, Islamic Azad
University, Tehran, Iran.)
Lobat Taghavi
4
(Assistant Professor, Environment and Energy Faculty, Science and Research Campus, Islamic Azad
University, Tehran, Iran.)
Keywords: Water quality, pollution sources, district 14th of Tehran, GIS,
Abstract :
The important issue about groundwater resources includes; understanding the characteristics of thelocal watershed or aquifer, distinguishing cases leading to their contamination and managing them.In this study, during the October 1390 a total of 16 wells were sampled in order to evaluate anddistinguish the quality and menacing agents of district14th, Tehran’s groundwater sources.The concentration of the anions (NO2, NO3, Cl, SO4, CO3 and HCO3), cations (Mg, K, Na), and certainheavy elements like Pb, Cd and Ag, as well as other physical parameters(temperature, color and odor),chemical parameters (pH, EC, TSS, TDS) and MTBE were determined.Factors which were measured on the field were; pH, Electric Conductivity and temperature. The traceelements concentrations were measured by Graphite furnace atomic absorption, anion concentrationsby potentiometric and titration method, cation concentrations (Mg by titration method, K and Na byflaming measurement method) and MTBE concentrations were measured by CP-3800 GasChromatograph.Anion test results manifested an increase of nitrate, sulfate and chloride concentration in the southernand western stations which can be associated with the region’s south-west to north-east slope ,inaddition to the sandy texture of the area. The cation pollution of the East and Northeast wells havebeen manifested and the high increase in the amount of potassium might be related to the clay texture,sewage of the absorption wells and the fertilizers that are used in the parks. Among the heavy metalsonly cadmium had concentrations more than the standard levels.Agricultural activities, municipal wastewater, surface run-offs, eroded soil texture of the area as wellas the geological structure, lack of adequate boundaries in between the drinking and the waste waterwells have caused an increase in the contaminating effects of these sources. MTBE contamination wasnot indicated in any of the wells.