Estimation of total contamination of the clarifier of waste water in the town of Zhanaozen

Abstract

The article presents the results of the degree of contamination of the settling tank and calculates the
hydrochemical index of contamination. In the city of oil workers Zhanaozen insufficiently treated waste
water (WW) from municipal sewage treatment plants is discharged into a sump, which is a partially collapsed earthen container. The sump constantly contains waste water of various degrees of contamination, which are in it until a certain “critical” time. The special role of the sump is WW, being located
within the city limits, it is almost a “man-made” object, which is a source of creating a “critical” environmental and sanitary-epidemiological situation for the population. Water and sediment samples were
analyzed for heavy metals (Cu, Cd, Zn, Cr3+). The total pollution index was calculated to determine
the gross content of heavy metals Cr, Cu, Fe, Zn and metalloid As in bottom sediments. To obtain an
objective assessment of the degree of contamination of bottom sediments with heavy metals, several
indicators of total Z
C pollution were used. In settling ponds (buffer ponds), the concentrations of pollutants in suspended solids and in the upper layers of sediments are much higher than the concentrations
of substances dissolved in the water column. The results of the assessment of the calculation of the total
pollution of the settling tank located almost within the city of Zhanaozen, which turns it into a dangerous object, allow us to develop the most economically feasible and environmentally friendly method for
water purification.
Key word: Sedimentation tank, bottom sediments, waste water, heavy metals.