Sanitary Sewage Treatment with Jet Inner-loop Bioreactor

摘要

A jet inner-loop bioreactor (JIBR) was used to treat synthetic sanitary sewage with low, medium and high COD load. The experimental results show that it could meet discharge standard at 20|30 min of HRT (hydraulic retention time) for low COD concentration and 60|120 min of HRT for medium and high COD concentration. The maximal COD volume loading and COD sludge loading of 27 kg5m -3 5d -1 and 5 kg/d per kg MLSS were acheived respectively, that were 10|20 times higher than those of traditional wastewater treatment processes. The BOD 5 removal efficiency was more than 90% and NH + 4 —N more than 85%. The study on the activity showed that the oxygen consumption rate of the activated sludge in the JIBR was 39.13 mg5L -1 5h -1 , which was 1.7 times higher than that of the SBR(Sequencing Batch Reactor) and the dominant bacteria in jet inner|loop bioreactor was Pseudomonas species.