Effectiveness of single-stage and sequential sludge digestion on removal of recalcitrant pharmaceuticals and conventional pollutants

被引：6
作者：
Ahmad M. [1 ]
Abbott T. [1 ]
Eskicioglu C. [1 ]
机构：
[1] UBC Bioreactor Technology Group, University of British Columbia, Kelowna, V1V1V7, British Columbia
来源：
Bioresource Technology Reports | 2019年 / 8卷
基金：
加拿大自然科学与工程研究理事会;
关键词：
Aerobic/anoxic digestion; Anaerobic digestion; Endocrine disrupting compounds; Pharmaceuticals; Sequential digestion;
D O I：
10.1016/j.biteb.2019.100326
中图分类号：
学科分类号：
摘要：
The fate of pharmaceuticals, azithromycin (AZI), carbamazepine (CBZ), diclofenac (DCF), mefenamic acid (MFA), ibuprofen (IBP) and one ibuprofen metabolite (1-hydroxy ibuprofen (1-OH IBP)), were investigated in single-stage anaerobic (AN) and sequential anaerobic/aerobic/anoxic (AN/AERO/ANOX) sludge digestion under thermophilic conditions (55 °C). Intermittent aeration was used for the sequential AERO/ANOX vessel. Digesters showed an increase in CBZ, MFA and DCF at a hydraulic retention time (HRT) of 18 days as organic matter is degraded. However, the rate of increase for MFA was 10 times lower in sequential digestion compared to single-stage AN digestion (control). Sequential AN/AERO/ANOX digestion showed a 50% decrease in IBP levels while increasing IBPs aerobic metabolite 1-OH IBP by 12%. The control AN digester showed a 62% increase in IBP and a 34% decrease in 1-OH IBP. Sequential digestion provided other benefits, including reduced ammonia generation (44.5%), improved solids removal (4.1%) and enhanced digestate dewaterability (20%) compared to the control. © 2019 Elsevier Ltd
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