Research on the effects and working condition of Compound Multi-Grade Biological reactor in the urban waste water disposal

The author has made the research on recycle use of the urban waste water applying the own designed Compound Multi grade Biological Reaction-BAF technique, especially pay more attention to the research on treatment effect and optimum operation conditions of the reactor. The experiment result shows that by controlling the contact oxidized area DO 2~3mg/L, active waste sludge area lmg/L, HRT 3.5h and MLSS1500g/L, the removal effect of the pollutants in urban waste water by the reactor can get to its optimum operation, and the removal rates are SS 76%, BOD₅ 94%, COD_cr 90%, NH₃-N 74% TP 43%.