Impact of industrial wastewater on water and fish quality of Nile River in Kafr El-Zayat, Egypt

Document Type : Original Article

Authors

1 Hygiene and Preventive Medicine Dept., Fac. Vet. Med., Kafr elsheikh University

2 Food Hygiene Dept., Tanta lab., Animal Health Research Institute

Abstract

In Egypt, Rosetta branch of the Nile River is impacted by several industrial effluents at Kafr El-Zayat
City, which potentially affect and deteriorate its quality. To study the impact of these effluents on
aquatic environment of the Rosetta branch, a total of 108 water samples and 36 fish samples were
collected during the spring and autumn 2010 from 9 different regions along the branch at Kafr El-
Zayat industrial area. Chemical analyses of water samples showed seasonal variation of pH, Pb, Cd,
and NH3 values. Cu concentrations in the water were below the maximum permissible limit, however,
Pb, Cd, Hg, P, NH3, and S exceeded the permissible limit. The distribution of these parameters at the
area under investigations are strongly affected by the industrial effluents produced from El-Mobidat,
El-Malyia and Salt and Soda companies which directly discharge industrial effluents at this area
without any treatment. The presence of high levels of Pb, Hg, NH3, and S in the fish muscles were in
relation to water pollution in the studied area. The bacteriological analyses showed that TBC ranged
from 1.9 x103 to 5×105 cfu/ml for water and from 3×105 to 5×105 cfu/g for fish flesh. Importantly, the
water and fish samples tested were positive for Salmonella and negative for E. Coli. In conclusion, the
results demonstrate that the Nile River at Kafr El- Zayat industrial area is heavily polluted and
consequently harmful effects to the aquatic environment and to the quality of the water are established.
So, treatment and safe disposal of different industrial wastes is recommended

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