Pollution of nitrogen compounds is one of the main factors that lead to eutrophication of water bodies

and biological denitrification has become an effective technology for control of nitrogen pollution.The performance of denitrifying compartmentalized anoxic reactor(CAR) was investigated with synthetic wastewater.The results showed that CAR is a high-rate reactor for nitrate removal.When influent nitrate concentration was 964.7 mg稬-1

hydraulic retention time was 0.86 h

the nitrate removal rate(NRR) and COD removal rate(CRR) reached as high as 26.8 kg?(m3穌)-1 and 93.76 kg?(m3穌)-1

respectively

which all were at the top level reported in the literature.During the operation

CAR's performance was stability.In both efficiency-elevation phase and efficiency-stationary phase

relative variation coefficient and relative range of effluent nitrate are less than 9.85 and 9.07

respectively.At the same time

the relative standard deviation of effluent pH is less than 1.The good performance of CAR could be ascribed to high biomass concentration(more than 17 g稬-1(MLVSS)) and high specific activity(more than 1.57 g NO3--N?(g VSS)-1穌-1).