پديد آورندگان :
درگاهي ، عبداله نويسنده مربي و عضو هييت علمي گروه مهندسي بهداشت محيط، دانشكده علوم پزشكي خلخال، دانشگاه علوم پزشكي اردبيل، ايران*(نويسنده مسيول) Dargahi, Abdollah , پيرصاحب ، مقداد نويسنده دانشيار گروه مهندسي بهداشت محيط، دانشكده بهداشت، دانشگاه علوم پزشكي كرمانشاه Pirsaheb, Meghdad , سوادپور ، محمدتقي نويسنده مربي و عضو هييت علمي گروه پرستاري، دانشكده علوم پزشكي خلخال، دانشگاه علوم پزشكي اردبيل، ايران Savadpoor, Mohamadtaghi , عاليقدري ، مرتضي نويسنده استاديار گروه مهندسي بهداشت محيط، دانشكده بهداشت، دانشگاه علوم پزشكي اردبيل، ايران Alighadri, Mortaza , فرخي، مهرداد نويسنده دانشيار گروه مهندسي بهداشت محيط، دانشكده بهداشت، دانشگاه علوم پزشكي البرز، كرج، ايران Farookhi, Mehrdad
كليدواژه :
بركه تثبيت , حذف زيستي تركيبات آلي , دما , زمان ماند , فاضلاب نفت
چكيده لاتين :
Introduction:
Biological treatment method is one of the best and most cost-effective methods for the treatment of
contaminated wastewaters. The purpose of this study was to evaluate the effect of retention time and
temperature on the efficiency of stabilization ponds in removing organic compounds, N-NH3 and PO4
from oil refinery wastewater.
Materials and Methods:
The method used in the present study was of an experimental type, in which an anaerobic stabilization
pond with dimensions of 1 × 0.2× 1 m and a laboratory scale facultative pond with the capacity of 400
L were designed, set up and operated, using fiberglass sheet with a thickness of 6 mm. In this study,
the hydraulic retention time of 2 and 5 days for anaerobic pond and 5 and 10 days for facultative pond
were set in both hot and cold temperatures. Then, N-NH3 and PO4 parameters were measured at the
wavelengths of 425 and 690 nm respectively. Also, TCOD, SCOD, TBOD, SBOD and pH of samples
were measured according to the standard methods for water and wastewater tests.
Results and Discussion:
These results indicated that the retention time and temperature had a significant effect on the
efficiency of stabilization ponds, so that the efficiency of anaerobic and facultative stabilization ponds
in the removal of organic compounds was significantly increased with the increase of retention time
and temperature (p < 0.05). The maximum removal efficiency for COD, BOD, N-NH3 and PO4 was
obtained to be 93.31, 93.66, 88.15 and 73.17 % respectively (at the retention time of 5 days of
anaerobic and 10 days of facultative and hot temperature), and the minimum removal efficiency for
1-Department of Environmental Health Engineering, School of Khalkhal Medical, Ardabil University of
Medical Sciences, Ardabil, Iran
2-Department of Environmental Health Engineering, School of Public Health, Kermanshah University of
Medical Sciences, Kermanshah, Iran
3- Department of Nursing, School of Khalkhal Medical, Ardabil University of Medical Sciences, Ardabil, Iran
4-Department of Environmental Health Engineering, School of Public Health, Ardabil University of Medical
Sciences, Ardabil, Iran
5- Department of Environmental Health Engineering, School of Public Health, Alborz University of Medical
Sciences, Karaj, Iran
J.Env.Sci,Tech
J.Env. Sci. Tech., Vol 16, No.2, Summer 2014
153
the same parameters was obtained to be 41.47, 40.55, 34.26 and 22.46% respectively (at the retention
time of 2 days of anaerobic and 5 days of facultative and hot temperature). Also, the single alga
available in the facultative pond was formidiom and it was able to grow in high concentrations of
sulfur.
The results of this study showed that the pilot-scale stabilization ponds in hot temperature, if operated
proprly, have the ability to remove organic compounds with a high efficiency. However, in cold
weather, its efficiency is low but in acceptable level.
