Using Combined Processes of Filtration and Ultraviolet Irradiation for Effluent Disinfection of Isfahan North Wastewater Treatment Plant in Pilot Scale

Document Type : Research Paper

Authors

1 Assoc. Prof., Research Center of Environment, Isfahan University of Medical Sciences, Isfahan.

2 Instructor of Environmental Health Eng., Faculty of Public Health, Shahrekord University of Medical Sciences, Shahrekord

3 Assist. Prof., Research Center of Environment, Isfahan University of Medical Sciences, Isfahan.

4 Prof., Research Center of Environment, Isfahan University of Medical Sciences, Isfahan.

5 M. Sc. of Industrial Eng., Isfahan Water and Wastewater Co., Isfahan

6 Expert of Environmental Health Eng., Isfahan Health Center, Isfahan

Abstract

This study was carried out to evaluate the secondary effluent disinfection of the Isfahannorth municipal wastewater treatment plant using filtration and UV technology in current operational condition. The combined system was used in series in pilot scale including: Pressure Sand Filter + Low Pressure (LP) + Medium Pressure (MP) UV Lamps. The UV dose varied according to the initial intensity of lamp, flow rate and influent transmittance. Total coliform (TC), fecal coliform (FC) and fecal streptococcus (FS) were analyzed as microbiological parameters in all effluent samples. TSS, BOD5, COD, VSS, pH and transmittance (UVT percentage) were tested as physicochemical parameters, before and after the units. Results showed that the filtration with loading of 1050 lit/m2.hr, followed by MP lamp with dose of 230 mW.s/cm2 is an effective alternative to reduce the TC/FC and FS in the secondary effluent. The combined disinfection processes that were used in this study, could be met the standards of 1000 TC, and 400FC/100ml for effluent discharge to receiving waters or restricted reuses in the agriculture. This process can also inactivate the FS down to 6-log.Using low-pressure lamps due to low dose radiation for disinfection is not cost-effective. In this study, parasite egg counts due to lack of access to accurate identification techniques for alive cyst detection was not examined.
 

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References

1- Hosseinian, M. (2002). Reusing treated wastewater, 1st Ed., Olume Rouz Pub.,Tehran. (In Persian)
2- Asano, T., Burton, F. L., Leverenz, H. L., Tsuchihashi, R., and Tchobanoglous, G. (2007). Water reuse: Issues, technologies, and applications, Metcalf andEddy,N.Y.
3- New YorkStateEnergy Research and Development Authority. (2004). Evaluation of ultraviolet (UV) radiation disinfection, NYSERDA, Inc., N.Y.
4- Corbet, D. (2005). Wastewater reuse using UV disinfection, 1st Ed., Halma Co.,Netherlands.
5- Hamoda, M. F., Al-Ghusian, I.,  and  Al-Mutairi, N. Z. (2004). “Sand filtration of wastewater for tertiary treatment and water reuse.” Desalination, 164, 203-211.
6- Gomez, M., Rua, A., Garralon, G., Plaza, F., Hontoria, E., and Gomez, M.A. (2006). “Urban wastewater treatment disinfection by filtration technologies.” Desalination, 190, 16-28.
7- Liberti, L., Notarincola, M., and Petruzzelli, D. (2002). “Advanced treatment for municipal wastewater reuse in agriculture, UV disinfection: Parasite removal and by-product formation.” Desalination, 152, 315-324.
8- Dabbagh, R. (2009). “Microbial removal efficinency of UV in Tehran Shahid Mahallati wastewater treatment plant.” J. of Water and Wastewater , 69, 59-66. (In Persian)
9- Chen, J. P., Yang, L., Wang, L.K., and Zhang, B. (2006). Advanced physicochemical treatment processes, The Human Press Inc.,Totowa,NJ.
10- Tchobanoglous, G., Burton, F.L., and Stensel, H.D. (2003). Wastewater engineering: Treatment, disposal and reuse, 4th Ed., Metcalf and Eddy, McGraw-Hill Inc.,USA.
11- APHA., WEF. and AWWA. (2005). Standard methods for the examination of water and wastewater, 20th Ed., American Public Health Association,Washington,DC.
12- Guo, M., Bolton, R.J., and Din, G.M. (2009). “Comparison of low and medium pressure ultraviolet lamps: Photo reactivation of Escherichia coli and total coli forms in secondary effluents of municipal wastewater treatment plants.” J. Water Research, 43 (3), 815-821.
 
Journal of Water and Wastewater; Ab va Fazilab ( in persian )
Volume 22, Issue 2 - Serial Number 2
Serial number:78
July 2011
Pages 71-77

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