循环水工厂化养殖系统中浮球式生物滤器在不同工况下的水处理效果

本试验对浮球式生物滤器在不同工况下的水处理效率进行比较,结果表明:(1)无曝气条件下,随着水流量的降低,滤器的硝化效率呈增加趋势;NH4-N转化率和NO2--N转化率分别由水流量8 m3/h时的15.87%和23.84%增加到水流量2 m3/h时的38.85%和71.37%;COD去除率在4 m3/h的水流量下最高,达到10.33%;另外,不曝气各工况下出水溶氧和pH有所下降。(2)有曝气条件下,滤器水处理效率随水流量降低而增加;NH4-N转化率和NO2--N转化率分别由水流量8 m3/h时的6.45%和51.45%增加到水流量2 m3/h时的32.67%和93.36%;COD去除率在水流量4 m3/h下最高,为12.20%;有曝气各工况下出水溶氧和pH都有所增加。(3)对无曝气和有曝气各工况进行比较,结果显示有曝气组各工况水处理效率优于无曝气组。(4)对试验中各工况的日水处理效果进行比较,认为有曝气条件下水流量维持在6 m3/h为适合生产的最佳工况。

Study on the water treatment efficiency of floating bead biological filter under different working conditions based on the recirculating aquaculture system

Biological filtering is the core technology in maintaining the regular running of the high density of factory aquaculture.The well running filter will be effective in nitrification,which will be affected by different working parameters.Although there are some reports on biological filtering,all lack the research on the practical system directly.In this paper,the water treatment rates of floating bead biological filter under different conditions are compared.The results indicated that:(1) Without aeration,the nitrification efficiency of the floating bead biological filter is increased along with the reducing of the water influent;The removal rates of NH_4-N and NO~-_2-N are increased from 15.87% and 23.84% at 8 m~3/h influent to 38.85% and 71.37% at 2 m~3/h influent respectively;The best removal rate of COD is 10.33% when the influent reaches 4 m~3/h;Additionally,without aeration,the DO and pH of the outlet water from floating bead biological filter all have a little decrease.(2) Under the conditions with aeration,the water treatment efficiency also increased along with the reducing of the water influent;The removal rate of NH_4-N and NO~-_2-N are increased respectively from 6.45% and 51.45% at 8 m~3/h influent to 32.67% and 93.36% at 2 m~3/h influent;The best removal rate of COD reaches 12.20% when the influent is 4 m~3/h;The DO and pH of outlet water from the filter have some increase under these conditions with aeration.(3) The comparison of the conditions without aeration to the conditions with aeration indicates that the water treatment efficiency under conditions with aeration is superior to that without aeration.(4) The comparison of the water treatment efficiency under all conditions shows that the 6 m~3/h influent with aeration is the optimum working condition for fish cultivation.