Sewage algae and the efficiency of wastewater treatment plant at port said, Egypt
Azab, Y., El-Gougary, O., Ibraheim, W., Khuweity, H. (1999). Sewage algae and the efficiency of wastewater treatment plant at port said, Egypt. EKB Journal Management System, 7(1), 85-102. doi: 10.21608/jpces.1999.462095
Y. A. Azab; O. El-Gougary; W. Ibraheim; H. Khuweity. "Sewage algae and the efficiency of wastewater treatment plant at port said, Egypt". EKB Journal Management System, 7, 1, 1999, 85-102. doi: 10.21608/jpces.1999.462095
Azab, Y., El-Gougary, O., Ibraheim, W., Khuweity, H. (1999). 'Sewage algae and the efficiency of wastewater treatment plant at port said, Egypt', EKB Journal Management System, 7(1), pp. 85-102. doi: 10.21608/jpces.1999.462095
Azab, Y., El-Gougary, O., Ibraheim, W., Khuweity, H. Sewage algae and the efficiency of wastewater treatment plant at port said, Egypt. EKB Journal Management System, 1999; 7(1): 85-102. doi: 10.21608/jpces.1999.462095

Sewage algae and the efficiency of wastewater treatment plant at port said, Egypt

Journal of Pest Control and Environmental Sciences
Volume 7, Issue 1, April 1999, Pages 85-102    PDF (944.17 K)
Document Type: Original Article
DOI: 10.21608/jpces.1999.462095
Authors
Y. A. Azab* 1; O. El-Gougary2; W. Ibraheim1; H. Khuweity1
1Dept. of Botany. Fac. of Sci. Univ, Mansoura
2Plant Protection Institute, Agric, Res, Center
Abstract
Algae in the lagoons of wastewater treatment plant at Port Said were analyzed qualitatively and quantitatively for the biological indication of the change and improvement in wastewater quality from aerated through facultative and polishing lagoons before pumping the treated wastewater into lake Manzala. The first treatment lagoon proved to be dominated by blue-greens, and in the algal toxicity assessment showed to be anoxic with higher filtrate concentrations. The anoxic zone of the facultative lagoon was also dominated by blue-greens. I's filtrate showed no toxicity when tested with Selenastrum capricornutum. The toxic zone of the facultative pond was quite different reflecting a clear change in the quality of water. It was dominated by centric diatoms and chlorococcalean algae. When assessed for toxicity, it showed stimulation except at 90 and 100% filtrate which showed dramatic toxicity even lower than the EC50. Its toxicity may be referred to the high count of Oscillatoria amphibia. The polishing lagoon had a rich algal vegetation dominated by the centric diatom Cyelotella menegheniana followed by the chorococealean Crucigenia terrapedia. Its filtrate showed a slight toxicity with concentrations over 70% which could be again referred back to the high counts of Oscillatoria amphibia. The effluent pump station was dominated by Cyclotella menegheniana and the chlorococcalean. Ankistrodesmus falcarus. When assessed with the algal bioassay, it showed no toxicity except over 90% concentration. These qualitative and quantitative phytoplankton analysis with the toxicity assessment by algal bioassays proved an insufficient efficiency of the Port Said wastewater treatment plant. This biological analysis is in agreement with data of BOD5, COD and TSS that were compared in the influent and effluent wastewater.
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