Biological and Bio- desalination treatments of Mixed Sewage Water

Sayed Ismail, Eman Marei, Ahmad Hassan and Abd Elghany El-Gindy ; Marie, Eman 


Background: The wastewater is known as a mixture of one or more kinds of different water such as domestic, comprising hospitals, industrial wastewater and agricultural water. Hypersaline environments are important for both surface extension and ecological significance. As all other ecosystems, they are impacted by pollution. However, the available information on the biodegradation of organic pollutants by halophilic microorganisms in such environments are quite limited. Moreover, it is well known that 5% of industrial effluents are saline and hypersaline. The non-extremophilic microorganisms are unable to efficiently remove the organic pollutants at high salinity. Halophilic microorganisms are different metabolically and are adapted to high salinity. Therefore, these microorganisms are highly recommended to be used in bioremediation of hypersaline environments and treatment of saline effluents. Objective: This study aims to investigate the ability of different compounds in biological treatments of saline wastewater as a new technique for bio-treatment, bio-desalination and bio-removal of different heavy metals in nature circumstances. These compounds were compound I which contains mixture of different bacteria and compound II which contains mixture of different algae. These compounds were prepared under Lab condition. Results: The obtained results indicated that the removal efficiency for bio-treatment, the percentage of removal rate was found to be 79.8 and 83.5% for BOD, 82.4 and 86.3% for COD, 52.9 and 57.2 % for ammonia nitrogen and 85.8 and 98.51 % for phosphate. The high bio-removal to different heavy metals were found to reach 84.0 % and 78.50% for Al ion, 63.2 %, 85.50% for Fe ion, 85.0 % and 89.9 % for Mn ion and 78.9 % and 84.3 % for Zn ion. The results indicated that the high removal efficiency and high reduction for TDS were found to reach 39.0 % and 36.0% after 4 & 8 days in case of using compound I and compound II, respectively. The value of power equation > exponential equation for bacteria treated and algae. The correlation coefficient (R2) value of bacteria treated at 0.99, whereas for algae treated at 0. 89 for bio-desalination. Conclusion: On the basis of the obtained results it can be concluded that different biological treatments of saline wastewater with compound I and compound II were found to be effective in removal of heavy metals and reduction to TDS at 39.0 % & 36.0 % after 4 days incubation period at 40 º C and 8 days incubation at 27°- 30°C for compound I and compound II respectively.

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Keywords Wastewater bio-treatment, Biosorption heavy metals, Biological desalination.
Issue Date 2017
Publisher DOI: 10.22587/ajbas.2017.11.13.12 Journal home page:
Journal Australian Journal of Basic and Applied Sciences 11(13):108-114 

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