Subscribe Now Subscribe Today
Science Alert
 
Blue
   
Curve Top
Pakistan Journal of Biological Sciences
  Year: 2007 | Volume: 10 | Issue: 22 | Page No.: 4008-4014
DOI: 10.3923/pjbs.2007.4008.4014
 
Facebook Twitter Digg Reddit Linkedin StumbleUpon E-mail

Phosphorus and Nitrate Removal by Selected Wastewater Protozoa Isolates

O.B. Akpor, M.N.B. Momba and J. Okonkwo

Abstract:
In the present study, the efficiency of ten selected wastewater protozoa in the removal of phosphorus and nitrogen and their effects on other physico-chemical parameters was investigated. Protozoa were isolated from the aerobic zone of Daasport wastewater treatment plant, in Pretoria, South Africa, using the modified Chalkey’s medium. The isolates were screened for nutrient removal ability in shake flasks, at laboratory temperatures for 96 h. During each sampling, aliquot samples were collected for the analysis of phosphorus, nitrate-nitrogen, Chemical Oxygen Demand (COD), Dissolved Oxygen (DO), pH, of the mixed liquor including the growth rate of the isolates using standard methods. The results indicated a steady increase in growth rate of the isolates and all the isolates used in this study showed some measure of phosphorus and nitrate removal ability. In the presence of the test protozoa isolates, an increase in COD and a decrease in DO were noted in the mixed liquor inoculated with the organisms, while the pH only increases slightly. This study revealed a significant correlation between growth rate and nutrient removal (R = -0.806, p<0.001 for phosphorus; R = -0.799, p<0.01 for nitrate). The present study has been able to show that certain protozoa isolates have the ability to biologically remove phosphorus and nitrate from effluent. Consequently, it would be necessary to identify what strains of protozoa are capable of excess phosphorus and nitrogen uptake for the treatment of wastewater.
PDF Fulltext XML References Citation Report Citation
 RELATED ARTICLES:
  •    Challenges in Meeting the MDGs: The Nigerian Drinking Water Supply and Distribution Sector
How to cite this article:

O.B. Akpor, M.N.B. Momba and J. Okonkwo, 2007. Phosphorus and Nitrate Removal by Selected Wastewater Protozoa Isolates. Pakistan Journal of Biological Sciences, 10: 4008-4014.

DOI: 10.3923/pjbs.2007.4008.4014

URL: https://scialert.net/abstract/?doi=pjbs.2007.4008.4014

COMMENT ON THIS PAPER
 
 
 

 

 
 
 
 
 
 
 
 
 

 
 
 
 
 
 
 
 
 
 
 
 

Curve Bottom