INVESTIGATING THE BIOPOLYMER CAPACITY OF BACTERIA IN COAGULATION AND FLOCCULATION OF WATER TREATMENT AND SEWAGE TREATMENT

Background and Aim:In this study, biopolymers released from selected bacteria from a sewage treatment system, known as active sludge, are extracted according to the characteristics of flocculation and its characteristics. The biopolymers as a coagulant is a substitute for common chemicals in the sewage purification industry and the treatment of contaminated water.Methods:Firstly, the biological bacteria producing bacteria from sludge produced by the municipal wastewater treatment plant are identified and separated. Different types of culture medium and differential tests are used to isolate bacteria. In the following steps, the bacterial flocculation activity is measured using extrapolated bile polymers, and the ability of the bacteria is evaluated for the highest degree of flocculation activity. The extraction and purification of the bioflocculant is carried out further. Thermal tolerance of the bioflocculant is measured. To determine the clotting properties of extracellular polymeric materials and bio-polymer specimens, the effect of bioflocculant dose and pH of the solution is tested.Results:The purified bioflocculant from bacteria was evaluated. The study showed that extraction bioflocculant have a thermal bearing and retain their flocculation activity after having tolerated 100 ċ for more than 90% of the flocculation property. The chemical analysis shows that biofloquoland consists of 56.74% polysaccharide, 2.066% protein. FTIR spectroscopy confirms the presence of hydroxyl groups, carboxyl groups and amine groups.Conclusion:The results of this study showed that bioflocculant produced by bacteria could be an appropriate flocculation option for water and sewage treatment, considering its biodegradability.

کلیدواژه ها:

Biopolymer ، bioflocculant ، water Treatment