Biology-Ozone-Biology The “Biology-Ozone-Biology” combination is a more extensive wastewater treatment process using ozone. Two-stage biological treatment cannot adequately tackle a higher COD load, as lignin and lignin derivatives form a low-activity residual COD that cannot be broken down biologically. Here ozone treatment as a third treatment stage can be used for further COD elimination. While the complete breakdown of the low-activity COD

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