Preparation of ultra-lightweight sludge ceramics (ULSC) and application for pharmaceutical advanced wastewater treatment in a biological aerobic filter (BAF)
2011
Wu, Suqing | Yue, Qinyan | Qi, Yuanfeng | Gao, Baoyu | Han, Shuxin | Yue, Min
Novel media-ultra-lightweight sludge ceramics (ULSC) employed in an upflow lab-scale biological aerobic filter (BAF) were investigated for pharmaceutical advanced wastewater treatment. The influences of the volume ratio of pharmaceutical wastewater to domestic wastewater (PW/DW), hydraulic retention time (HRT) and air–liquid ratio (A/L) on chemical oxygen demand (CODCr) and ammonium (NH₄ ⁺-N) of the effluent were investigated. When PW/DW of 4:1, HRT of 6h, and A/L of 5:1 were applied, the mean effluent concentration of NH₄ ⁺-N was 6.2mgL⁻¹, and the maximum CODCr concentration in the effluent was 96mgL⁻¹. Both NH₄ ⁺-N and CODCr did not exceed the limits of the national discharge standards (NH₄ ⁺-N⩽15mgL⁻¹, CODCr⩽100mgL⁻¹). In addition, the BAF system showed a strong capacity of further removal from NH₄ ⁺-N of the effluent.
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