Volume 9, Issue 2 (Scientific Journal of Hamadan University of Medical Sciences-Summer 2002)                   Avicenna J Clin Med 2002, 9(2): 0-0 | Back to browse issues page

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Abstract:   (3901 Views)

At the present time, there is not a main sewerage and  sewage 
   treatment  plant in Tehran but some small sewage treatment plants were
   built in this city. The main objectives of this study were to investigate the
   stabilization  condition  and  reuse of  the disposal  sludge in  some of  these
   treatment  plants.

          This research completed on four sewage treatment plants consisting of 
   Shoush, Ghytareyh, Ekbatan and Sahebghraneyh over ten months (October
   1996 to July  1997). The general condition and operation of these plants
   were considered and also indexes of sludge stabilization and reuse
   including VS/TS ratio, pH, flotation, color, odor, coliform and fical  coliform  
   were  determined.

          The average ratios of VS/TS in disposal sludge of sewage treatment
   plants; Shoush, Ghytareyh, Ecbatan and  Sahebghraneyh were estimated
   and been 69.25%, 70%, 71% and 70.25% respectively. The average of pH
   values in disposal sludge of sewage treatment plants; Shoush , Ghytareyh ,
   Ekbatan  and  Sahebghraneyh  were determined and they were 6.48, 6.93,
   6.68, 6.65 respectively. Also the average fical coliform density in  disposal 
   sludge of sewage treatment plants; Shoush, Ghytareyh, Ecbatan and
   Sahebghraneyh were estimated and they were  2.61´106 , 2.68´105, 7.5´105 ,
   1.2´107 per gram  respectively.

          The results of this research showed  that the disposal sludge from these
   plants  were  raw  and destabilized. The microbial quality of the disposal
   sludge  was evaluated and  results showed that maximum was in  class B of
   USEPA  category. Therefor, at  the best  condition the disposal sludge may
   be used for the reconditioning the poor  soil  or  forest  areas, but never be  
   used as a fertilizer for  the agriculture. If these types of  sludge are used as a 
   fertilizer, so microbial  quality of  these  must be improved up to class A of 
   USEPA category  with additional stabilization process.

Type of Study: Original | Subject: Other Clinical Specialties

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