Hi Lin, as Philippe has ...
Published by Ian Pearson
Hi Lin, as Philippe has said, the DO in the sludge return should be very low and not a problem. However I am trying to understand your process. You say the treatment seq
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1.The wastewater is treated by Anoxic, Oxic, and by degassing process.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%.
Published by Lin JYH-YAN, advanced engineer at FORMOSA PETROCHEMICAL CORPORATION