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Paper Information

Journal:   JOURNAL OF MOLECULAR AND CELLULAR RESEARCH (IRANIAN JOURNAL OF BIOLOGY)   2014 , Volume 26 , Number 3; Page(s) 266 To 277.
 
Paper: 

EFFECTS OF CRITICAL GROWTH OF PURPLE SULFUR BACTERIA ON WASTE STABILIZATION POND UNDER CONTEST CONDITION AND THEIR INFLUENCE ON PERFORMANCE EFFICIENCY OF WASTEWATER TREATMENT

 
 
Author(s):  BADALIANS GHOLIKANDI G., DEHGHANI FARD E., SAKIAN DEZFOULI M.R.
 
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Abstract: 

Purple bacteria could use sunlight as an energy source for their growth and reproduction. Since these bacteria are not able to use hydrogen of water as an electron donor, they need to use reduced forms of hydrogen like H2S, H2 or organic matters in which oxygen molecules are not produced in their photosynthesis process. These bacteria are of specified organisms in water found in many water resources. Because of their growth effects on wastewater stabilization ponds which have been considered as common wastewater facilities in Iran, investigations on their growth condition and important affecting parameters have been considered for design and operation of such facilities. The occurrence reasons of purple sulfur bacteria (PSB) in waste stabilization ponds were investigated. Physical and chemical parameters which affect on PSB growth like BOD5, COD, dissolved oxygen (DO), temperature, and hydrogen sulfide (H2S) were observed monthly. Results showed that the PSB dominated in two periods, which the first was in midsummer (in primary facultative pond) and the second was in midwinter (in tertiary facultative pond). This condition was occurred by low DO concentration in facultative ponds due to high organic loading rate (OLR) and also high concentration of H2S which were caused overcoming of the PSB over algae. Results showed that the OLR was the main affecting parameters in the overcoming of PSB.

 
Keyword(s): PURPLE SULFUR BACTERIA, WASTEWATER, STABILIZATION POND, SOUTHERN HOVAIZEH
 
References: 
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