Biological and Bio- desalination treatments of Mixed Sewage Water

Abstract

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.

Application of AZ compound as a bio-desalination and a bio-treatment of saline wastewater

“…can be used as an e cient bio-removal of organic matters that reached to 80.49% and as a bio-sorbent of iron ions the removal rate reached to 79%. Moreover, 3 found that the biological treatment of saline wastewater with bacterial compound was effective in removal percentages of organic matter which reached to 79.8% and 63.2 to 84.0% for different heavy metal ions after 4 days.…”

“…The reducing rate of salt water with MDCs in one cycle was found to be 43 +/-6%. 3 found that the bio-desalination treatment of saline wastewater by using bacterial compound reduced TDS to 39.0% after 4 days. Also, 8 found that the biological treatment with different free bacterial cells reduced TDS to 13.86% after 24 hrs.…”

“…The biological treatment of sewage water and bio-sorption of heavy metals by using bacteria and algae were successful after 48 and 96 hrs respectively 2,3 . Bio-sorption of different heavy metal ions by using Saccharomyces cerevisiae was investigated depended on initial pH, initial metal ion concentration and temperature and data showed e ciency removal of these ions by yeast 4 .…”

“…7 Reported that can be reduced for TDS from 80000 ppm up to 40000 ppm by using algae in several runs depended on sunlight duration & temperature during experiment. 3 Showed that the bio-treatment of sewage water by using bacteria was e ciency removal of organic matter 79.8%, different heavy metal ions 63-84% and reducing the TDS from 21632 ppm up to13248 ppm after 4 days. Also,8reported that the when using the mixture of different free bacteria cells was found to be effective as a bio-removal to organic matter was reached to 76.92% and 80.0-98.0% for biosorbent of different heavy metal ions of wastewater and reduced the TDS to 13.86% after 24 hrs.…”