低温条件下组合式浮床脱氮效果研究

Nitrogen Removal Effect of Integrated Floating Beds at Low Temperature

水温9.3~14℃、水交换周期为168h的条件下,构建了两组平行的玉米麸基质组合式浮床(Integrated floating bed with corn flakes,简称IFB-CF)和轻质陶粒基质组合式浮床(Integrated floating bed with light ceramsite,简称IFB-LC),以IFB-LC为对照组,研究了组合式浮床氮磷去除效果。结果表明:IFB-CF对TN、NO-3-N、NH+4-N的降解量分别为13.58±0.67mg/L、4.40±0.61mg/L、9.21±0.38mg/L,IFB-LC对TN、NO-3-N、NH+4-N的降解量分别为6.41±1.47mg/L、2.15±0.40mg/L、5.95±0.46mg/L;IFB-LC和IFB-CF对COD的去除率分别为86.89%和66.06%。

To investigate the effect of combined floating beds on nutrient removal under low temperature,an integrated floating bed with corn flakes(IFB-CF) and an integrated floating bed with light ceramsite(IFB-LC) were constructed in parallel.IFB-LC was used as control group under water temperatures of 9.3~14 ℃ and a water exchange time of 168 h.Nitrogen and phosphorus removal efficiency,the nutrient level of a hydrophyte(Oenanthe javanica),and the microbial population characteristics of the combined floating bed were investigated.For IFB-CF removal efficiencies,the degradation quantities of total nitrogen(TN),NO-3-N,and NH+4-N for IFB-CF were 13.58±0.67 mg/L,4.40±0.61 mg/L,and 9.21±0.38 mg/L,respectively;in contrast,degradation quantities for IFB-LC were lower(6.41±1.47 mg/L,2.15±0.40 mg/L,and 5.95±0.46 mg/L,respectively).The reductions in COD(Chemical Oxygen Demand,using K2Cr2O7 as oxidizer) for IFB-LC and IFB-CF were 86.89% and 66.06%,respectively.