Treatment of Lignite-Derived Water Produced from Hot Press Upgrading by a Combined A2/O-UBAF Process

The water quality of lignite-derived water produced from Hot Press Upgrading (HPU) is in breach of the reuse standard for power plant´s circulating cooling water. This study assesses the water characteristics of lignite-derived water as follows: The BOD₅/COD ratio is 0.85. The pH value of lignite-derived water samples is from 6.65 to 6.85. The lignite-derived water´s properties parameters such as turbidity, BOD₅, COD_Cr, Mn and NH₃-N are higher than the reuse standard for power plant´s circulating cooling water. A combined treatment process, A²/O-UBAF, was developed for remediation of the lignite-derived water in this paper. After the treatment, the lignite-derived water´s quality can meet the reuse standard for power plant´s circulating cooling water in China.