@article {10.3844/ajessp.2010.500.504,
article_type = {journal},
title = {Application of Gamma irradiation in treatment of Waste Activated Sludge to Obtain Class a Biosolids},
author = {AL-Ghonaiem, Mohammed I. and Ibrahim, Abdelnasser Salah Shebl and Al-Salamah, Ali Abdullah},
volume = {6},
number = {6},
year = {2010},
month = {Dec},
pages = {500-504},
doi = {10.3844/ajessp.2010.500.504},
url = {https://thescipub.com/abstract/ajessp.2010.500.504},
abstract = {Problem statement: The main objective of the current study was investigation of the
possible application of Gamma irradiation for treatment of the activated sludge generated
wastewater treatment stations, to achieve the standard requirements in term of pathogens content.
Approach: Activated sludge samples were collected from Riyadh wastewater plant and analyzed
quantitatively for the presence of important bacterial parameters including fecal coliforms and Salmonella
spp. The collected samples were treated with various doses of Gamma irradiation and bacterial count was
determined. Results: The results indicated that all tested sludge samples were positive for the presence of
fecal coliforms and Salmonella spp, with different counts in different stages of wastewater treatment. The
raw sludge showed to have the highest coliforms and Salmonella spp counts of 1.1×108 and 2×103 MPN g-1 dry sludge, respectively. Furthermore, coliforms and Salmonella spp were detected in final resulted sludge with count of 2.5×107 and 6×102 MPN g-1 dry sludge, respectively. It was found that treatment of samples with gamma irradiation was able to reduce the fecal coliforms and Salmonella spp effectively and the reduction efficiency was increased by increasing the irradiation dose. Fecal coliforms and Salmonella counts were reduced to less than 100 MPN g-1 dry sludge by exposing to 1.5 and 0.25 kGy respectively. Furthermore, Gamma radiation dose of 2.0 kGy was able to remove both fecal coliforms and Salomnella spp completely. In addition, D10 values were determined and was found to be 0.25 and 0.24 kGy for fecal coliforms and Salmonella spp., respectively. Conclusion/Recommendations: The results indicating that the resulted activated sludge generated from Riyadh wastewater plant are rich with important pathogens and therefore further treatment procedures are necessary to achieve the required standards, before any land application. Application of Gamma irradiation in treatment of the activated sludge showed to be a promising safe technology for this purpose.},
journal = {American Journal of Environmental Sciences},
publisher = {Science Publications}
}