جستجوی مقالات مرتبط با کلیدواژه « saltwater » در نشریات گروه « پزشکی »

Due to the fresh water scarcity in many parts of the world, desalinating of water and wastewaters has been taken into consideration now. Microbial desalination cell (MDC) is a new technology which can desalinate water, generate electricity, and simultaneously purify wastewaters in a reactor. However, low current generation and deionization are from main challenges of this process. This study aimed to improve the MDCs efficacy. Three-cell MDC consisted of anode, cathode, and middle chambers, was designed. Here, ozone was used as a new electron acceptor in MDC (O3-MDC), and middle chamber solution containing 20 g/L NaCl was pretreated by ultrasonic process. The reactor operated under oxygen diffusion (O2-MDC), and without ultrasonic pretreatment was chosen as control. Biofilm formation on anode surface and dominant bacteria in the O3-MDC reactor were studied using Scanning Electron Microscopy (SEM), and 16S rRNA gene sequencing, respectively.
Findings: saltwater pre-treatment caused to increase the electrical conductivity from 28.1 ms/cm to 35.5 ms/cm. Moreover, the use of ozone in the reactor significantly improved the reactor performance in terms of bioelectricity generation and water desalination, so that O2-MDC and O3-MDC were able to remove 74% and 55.58% of NaCl from water, respectively. Proteobacteria, firmicuites and acidobacteria were dominant microbial communities in the anode biofilm based on 16S rRNA sequencing. Modified MDC can be a good option for water desalination if properly navigated. Although the process is still subject to some limitations, conducting such studies can provide basics of process operationalization and commercialization.