Joud Mahnaya^{* (1 )}, Nada Altonji ⁽¹⁾, Muhammad Manhal Alzoubi1⁽²⁾ and Abdulghani Alkhaldi ⁽³⁾

(1). College of technical Engineering, University of Aleppo, Aleppo, Syria

(2). General commission for scientific Agriculture Research, Damascus, Syria.

(3). General commission for scientific Agriculture Research, Aleppo, Syria.

(*Corresponding author: Eng.  Joud Mahnaya. E-Mail: joud.mhanaya@gmail.com)

Received: 27/06/2021                                 Accepted: 13/07/2021

Abstract

Water pollution is considered one of the most important current risks due to the transmission of pollution to soil, vegetation and crops, especially its contamination with heavy metals due to its cumulative effect and lack of decomposition. Especially contaminated with untreated sewage water that irrigates agricultural soils, after the sewage treatment plant in Aleppo was sabotaged, these areas became irrigated from that water. The aim of this research is to study the extent of pollution of the Queiq river course below that station with some heavy elements (Pb – Cd – Ni – Cr) and the study of its chemical and bacterial contamination , Where water samples were collected from 10 sites along the river from the treatment plant and towards Al-Wadhahi in both summer and winter, where the results of the analysis of heavy elements for lead in summer were between (0.1-0.6 ppm) and in winter ranged between (0.04-0.12 ppm). And nickel in summer ranged between (0.01-0.02 ppm) and in winter ranged between (0.01-0.02 ppm) and chromium in summer ranged between (0.01-0.06 ppm), and in winter it ranged between (0.01-0.07 ppm) and cadmium in summer Between (0.01-0.06 ppm) and in the winter between (0.08-0.09 ppm), and all were within the permissible limits except for cadmium, which was outside the permissible limits. As for the chemical analyzes, the results showed the values ​​of COD in the summer between (100-940) mg /L, while in the winter it ranged between (18-120) mg /L, As for the required bio-oxygen BOD values, its values ​​ranged between (110-170) mg/liter in the summer, and between (6-24) mg/liter in the winter, and all of them were outside the permissible limits. Salmonella and Shigella range in summer from (2000-31000) eggs, while in winter (2000-30000) eggs, all are outside the permissible limits The E-coli population was in summer between (2000-30000) Bacillus and in winter between (8000-39000) Bacillus and was outside the permissible limits.

Key words: sewage pollution , Queiq river, Cd,  Pb, Ni, Cr

Full paper in Arabic: pdf