Development Of Novel Electrochemical Membrane Separation Technologies For Wastewater Resources Recovery And Desalination

Environmental pollution and resource shortages have been the major challenges that constrain the sustainable development,One possible way to address these issues is to realize the zero liquid discharge and resources recovery(such as nitrogen and phosphours),and in the meantime to recover clean water for regeneration.The fast development and application of IEMs,provides an opportunity to recover water and nutrients from wastewater.Herein,in this work,novel seletive electrodialysis(SED)technologies,were developed for secondary wastewater desalination and simultaneous recovery of resources.The novel BES technique was used to remove organisms and demineralize of municipal wastewater,simultaneously recover nitrogen and phosphorus.Main contents and results are as follows:1?The novel SED with the monovalent anion exchange membrane(MVA)was operated with different voltages,flow rates and IEMs trios under constant voltage mode.The SED achieved a well desalination performance for the conductivity<2?S/cm,and effective removal of N and P were achieved.The N and P got reconcentrated and recovered separately in different compartments.The current fitting demonstrated the greater flow rates could reduce the concentration polarization,and SED with more IEM trios could got higher ion remove efficiencies.2?A novel microbial electrolysis desalination cell(MEDC),which combined ED and microbial electrolysis cell(MEC),was developed for wastewater treatment and resources recovery.The organisms was consumend by the microbials of anode,the removal of COD was averaged above 74%.The desalination performance was limited by the lower concentration of COD,but the MEDC with more IEM pairs gained well desalination and resources recovery.The analysis of anodic microlbial community structures were conducted and the CV curves confirmed the enrichment of exoelectrogens.