The Study Of The Oxygen Filling Performance And Hanging Membrane In New Sequencing Batch Biofilm Reactor (SBBR)

This test studied the performance of monosodium glutamate wastewater treated by a new type filler-biofilm process. Several core issues were comparatively studied, including similarities and differences of two different sequencing batch biofilm reactors in the process of hanging film, and hydraulic characteristics of fluid in two types of reactor and so on. The main conclusions were as follows:(1) Eo and (Kla)20in New Reactor and Traditional Reactor were increasing with the addition of aeration. Let’s take New SBBR Reactor as an example, increasing aeration intensity could get higher oxygen transfer efficiency, and the increase rate of (KLa)20value in Reactor New was1.45times as many as that in Traditional Reactor. When aeration rate was0.8m3/h, E0and (KLa)20in Reactor New were both1.26times as many as those in Traditional Reactor Therefore, New SBBR Reactor had better oxygen mass transfer ability and higher oxygen transfer efficiency.(2) Because there existed filler basket in New Reactor,it prevented lateral movement of bubble effectively, increased the probability of bubble vertical movement, and increased the probability that filler cut bubbles, thereby increased the contact area between gas and liquid, and improved the oxygen mass transfer ability. Compared with Traditional SBBR Reactor, New SBBR Reactor had a better energy-saving effect, and had higher oxygen transfer efficiency.(3) After the culture of hanging film, polypropylene sheet attached with a certain thickness of the biofilm inside the filler ball in two reactors could be observed. Maturation time of biofilm on the filler in New Reactor was40days, mature biofilm capacity was57.96mg/g,and the biofilm thickness was1.21～1.98mm. But maturation time of biofilm on the filler in Traditional Reactor was45days, mature biofilm capacity was41.20mg/g, and the biofilm thickness was0.62～1.38mm. A variety of microorganisms were found by microscopy, biological chain in the system could be extended, and sludge production was greatly reduced.(4) During the test, with the biofilm capacity increased, the removal rates of COD were gradually increasing, the maximum was95%, and the system also had a higher capability of resistance to the shock load. To ammonia nitrogen, when microorganisms were not adapted to the new environment, removal rates of two ammonia nitrogen fluctuated widely, but when the system stabled, removal rates of ammonia nitrogen in New Reactor and Traditional Reactor were separately maintained at96and93%. To TN, because of the formation of biofilm, removal rates of TN were also obviously improved, removal rates of TN could be separately maintained at80%and77%after hanging film matured, and they tended to be stable.