AEB反应器反硝化处理高浓度硝酸盐废水

采用缺氧膨胀床(AEB)反应器处理高浓度硝酸盐废水,研究了反应器的快速启动和挂膜特性,以及在反硝化连续流运行条件下对废水的处理效果。实验结果表明:采用自然挂膜方式,填料层从下至上生物膜厚度逐渐增加;AEB的快速启动8 d可完成,COD去除率由44.9%升至92.3%,NO_3^--N去除率由39.8%升至98.4%;稳定运行阶段(进水COD 4 628～5 548 mg/L、ρ(NO_3^--N) 1 339～1 505 mg/L),COD去除率稳定在95%左右,NO_3^--N去除率稳定在98%～99%,COD和NO_3^--N的容积负荷去除量最高可达27.8 kg/(m^3·d)和7.3 kg/(m^3·d)。

Denitrifying treatment of high-concentration nitrate wastewater by AEB reactor

The high-concentration nitrate wastewater was treated in an anoxic expanded bed （AEB）reactor,and the fast start-up and biofilm culturing properties of the reactor and the effects of wastewater treatment under continuous flow and denitrifying conditions were investigated. The experimental results showed that：The thickness of biofilm on packing layer was increased from bottom to top by natural biofilm culturing;After 8 day’s fast start-up,the removal rate of COD and NO₃^--N was increased from 44.9% to 92.3% and from 39.8% to 98.4%,respectively;During the stable operation,the removal rate of COD and NO₃^--N was kept at 95% about and 98%-99%,respectively,and the highest removal volume loading of COD and NO₃^--N was 27.8 kg/（m³·d）and 7.3 kg/（m³·d）,respectively,under the conditions of influent COD 4 628-5 548 mg/L and ρ（NO₃^--N）1 339-1 505 mg/L.