The Feature Analysis Of A Two-Compartment Sbbr And Sludge Operated With Alternate Aeration

A two-compartment SBBR operated with alternate aeration and fill was proposed. A traditional SBBR was divided into two identical compartments by a piece of vertical clapboard, and was filled by ceramic particles for biofilm growth. The reactor was operated as follows:fill from the left inlet, aeration by the right aerator, draw, fill from the right inlet, aeration by the left aerator, and draw. The aeration compartment and the non-aeration compartment in the reactor were clearly distinguished by the unique structure. Nitrification was dominant in the aeration compartment. Carbon source storage and denitrification were dominant in the non-aeration compartment. The whole system not only ensures carbon source used as electron donor for denitrification, but also creates anoxic zone. So, it could realize aerobic nitrogen removalThis experiment demonstrates the COD, NH4+-N, TN removal rate in the new SBBR could reach up to approximately78%-91%,95%-98%and 60%-82%respectively in the high C/N rate. It has a higher TN removal effect than a traditional SBBR when they are in the low C/N rate. The system also has a high effect on the semi-volatile organic compounds removal, most of the poisonous and harmful materials in water were degraded and the semi-volatile organic compounds were reduced from56kinds of species to18kinds of species together with significant concentration rate go down. There is no sludge discharge during the system operating period, which achieves a zero discharge of sludge.Based on the analysis, we found that the aeration compartment and the non-aeration compartment has similar bacteria species in the new SBBR. It has formed a complete ecological system by biological membrane which owns the feature of even distribution, rich quantity and long generation of biological species. Bacteria, protozoa, nematodes and caterpillar has united a complex biologic chain in this system. Besides the two-compartment operation, the main reason for sludge reduction is the invisible growth of bacteria, the transformation of biological level and the function of metazoan’s swallow ability on bacteria and biofilm fragments.