| Membrane bio-reactor(MBR)has many advantages which are not possessed by the traditional methods and it has a quite broad prospect. Membrane pollution and high energy consume are two main obstacles for MBR's extensive appliance.We designed a new typed MBR,which replaced the blast and omitted the out water pump.In 100 day's experiment in laboratory we studied the feasibility of this new MBR's practical application and studied its dispose effect for municipal wastewater and tried to discover potential problems. By experiment we found that jet aeration could realize very good oxygen consistence in the reactor between 6mg/L ~8mg/L.We also found it can garantee high sludge consistence in the reactor between 4000mg/L~7000 mg/L.Our experiment went through three sludge retain time(SRT,80days,40days,20days)and there were four enter water load in each SRT.No matter how the enter waer changed the water quality of the equit was very good.The wipe off ratio of COD exceeded 90%,nearly all excessed 95%; wipe off ratio of NH3-N exceeded 90%; wipe off ratio of turbid degree exceeded 90% and the turbid degree of the equit less than 1 NTU. At the beginning of the reactor operation ,Biochemical reaction in the removal of COD is in terms of a dominant position, but with the time run , the contribution rate of the membrane removal of COD increased. We feeled about the best cleanout mean: 1% NaOCl immersion for 20 hours and then 1% HCl soak 4 hours, we think that the cumulative recovery rate better response membrane cleaning effect. |
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