The Research Of Bio-electrochemical Water Treatment System With Conductive Membrane And Algae

The study of bio-electrochemical water treatment system with conductive membrane and algae,more should be to seek effective ways of recycling sewage contains energy.In this process,the development and utilization of the renewable energy becomes an important way,which apart from microbial fuel cell (MFC) can generate electricity by itself, such as carbon source, nitrogen source in sewage is most of the algae nutrients,therefore to seek a treatment process to implement the effluent water quality standard and recycling the purpose of the available energy is vital thing.Microbial fuel cell and photosynthetic microbial fuel cells (PMFC) has become a very promising energy recovery technology.But the MFC when applied in wastewater treatment,the effluent is hard to reach discharge standards;PMFC recycling and application in wastewater treatment is still a big problem.Membrane bioreactor (MBR) has high processing efficiency.cover of a small volume.easy to realize the advantages of automatic control has been widely applied to wastewater treatment and drinking water depth treatment technology.But the membrane fouling problem restricts the MBR technology of large scale promotion.The modification of water treatment and stainless steel net conductive membrane coupling PMFC electricity production reactor,build the MBR-PMFC system,used in wastewater treatment,electricity production and micro algae production achieve the goal of wastewater treatment and recycling energy.The whole study is divided into two parts.one is the conductive membrane modification research,experiment with stainless steel net as a modified substrate, modified stainless steel net plays a PMFC cathode electrode in the system and the dual role of MBR membranes.By in situ growth manganese dioxide polypyrrole, polyaniline and polymerization methods such as the realization of the aim of modification, in addition,through in the middle of the stainless steel net consisting of flat membrane adding activated carbon method,also played a very good effect;The second stage is the flocculation and immobilized microalgae research,through the method,can be the enrichment of micro algae growth,easy recycling and avoid the disadvantages of membrane filtration is not completely.By adding sodium alginate and calcium ions from chlorella form gels and curing, flocculation and immobilized by controlling the adding amount implementation.Through the stainless steel net surface modification,filtration precision improved. Experiment measured before modification of membrane flux is 75.6 m/(h·m),membrane flux is 21.6 m3/(h·2)MnO2 modification,MnO2@PPy modification of membrane flux is 1.96 m3/(h·m2),the membrane flux is reduced to about one over thirty-nine of the original; MnO2@PANI modification of membrane flux was 119.4 L/(h · m2),membrane flux decreased more than 600 times,filtering effect increased 8.7 times.The surface modification makes electricity greatly improved too.Stainless steel wire mesh in the system of the high power density of 0.08 W/m3,active carbon and stainless steel net combination membrane module,the high power density is 1.8 W/m3;Mn02@PPy modified stainless steel wire mesh of the high power density is 1.9 W/m3,improved the 22 times;MnO2@PANI modification of stainless steel net increased 15 times,maximum power density of 1.2 W/m3,stainless steel net as cathode electrode modification,its internal resistance close to 200-300 Ω.By increasing the micro algae processing link,the effluent COD removal rate was 93.3%,the removal rate of ammonia nitrogen from 67%to 94.9%.Immobilized chlorella,it’s growth by the first 2×109 after 10 days increased to 1.22×1010,increased by 6.1 times.