apologies - my system closed ...

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apologies - my system closed when I was half way through. I wanted to understand whether you recirculate after the oxic stage back to the anoxic stage to be able to convert the nitrates formed in the oxic stage to nitrogen gas in the anoxic stage.  This is a normal BNR sequence, and this stream is likely to carry a small amount of free oxygen into the anoxic stage, but it will be quickly used up when combined with the return sludge.  You would be recirculating at least 100% or more of the flow through the oxic tank back to the anoxic tank.  

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1.The wastewater of the oxic stage do not back to the anoxic stage now. The sludge ​of the oxic stage deal by the DAF ​process, and ​return to the ​anoxic process
2.if the DO of the oxic stage is 5~8 ppm, the nitrification reaction rate is not stabile, we think the high DO weak the active of the anoxic bacteria in the sludge, until we lower the DO of oxic stage to ~3 ppm, and the nitrification reaction is stabile, the denitrification reaction rate will be 40~50%.

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