Study On Characteristics Of Low C/N Wastewater Treatment By SBSMBBR Composite Reactor

In this research, laboratory simulations study and compared the treatmentefficiencies, especially efficiencies of removing nitrogen and phosphorus, ofSBSMBBR, SBR and SBMBBR reactors, with inflows of general sewage, low C/Nsewage and impact load. The study indicates that the SBSMBBR reactor hasadvantages over the other two in terms of treating the three types of inflow water.Under the condition of low C/N sewage, because of a lack of carbon source, totalmicrobial and microbial activity what in reactors declined, denitrification is blocked,nitrate accumulation in large quantities, the dephosphorization phosphorusaccumulating ability decline, results in lower efficiency of denitrification andphosphorus removal reactor; fill COD sludge load increased in a short period of time,fill COD increased, it makes the heterotrophic microorganisms are by far the growthrate of nitrifying bacteria, and heterotrophic bacteria overgrowth of nitrifying bacteria,nitrification is blocked, reactor denitrification ability decline; fill COD sludge load ina short period of time to reduce, insufficient carbon source that denitrification isblocked, nitrate accumulation in large quantities, reactor to remove nitrogen andphosphorus declined.In the second and third stage test, because of SBSMBBR’s two different carriertheir respective advantages, its different carrier competition between microbes andmicrobial evolution is also make its activity was stronger than the other two reactors.So fill such as low C/N sewage and impact load, SBSMBBR could get a better waterquality.At the same time, the test also concluded that: compared to the Biofilm,suspended sludge microorganisms on nitrification plays a leading role; biofilm thansuspended sludge is more advantageous to denitrification and phosphorus removal, inthe processing of low C/N and impact load of sewage sludge also has the sameconclusion, this kind of situation in SBSMBBR is especially striking.