Enhanced removal of pharmaceuticals in a biofilter: Effects of manipulating co-degradation by carbon feeding. (December 2019)

• Record Type: Journal Article
• Authors: Zhang, Liang; Carvalho, Pedro N.; Bollmann, Ulla Elisabeth; EI-taliawy, Haitham; Brix, Hans; Bester, Kai
• Is Part Of: Chemosphere. Volume 236(2019)
• Publication Date: 2019-12
• Subjects: Biodegradation -- Biofiltration -- Co-metabolism -- Micropollutants -- Sand filter; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2019.07.034
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Biofilm reactors are a promising biotechnology to eliminate pharmaceuticals from wastewater during tertiary treatment or in water works for drinking water production. This study aimed at investigating the effects of pulsed carbon feeding for promoting the co-degradation of indigenous pharmaceuticals from pre-treated wastewater in a fixed-bed porous biofilm reactor (slow sand filter). The addition of acetate (carbon source) resulted in three different enhancement/limitation effects, which were compound dependent: 1) atenolol and iohexol experienced enhanced co-degradation followed by constant (acetate independent) degradation; 2) metoprolol, iomeprol, diclofenac, propranolol and sulfamethizole co-degradation dependent on aerobic turnover, but inhibited at higher acetate concentrations (60–300 mg C/L); 3) sulfadiazine, sulfamethoxazole and trimethoprim were removed independently of oxygen and acetate concentration. Carbamazepine, ditriazoic acid, iopromide; tramadol and venlavaxine were not removed at any acetate dosage. Biofilm reactors can be employed for polishing treated wastewater, and the addition of a primary carbon source can enhance the performance of the bioreactor. Graphical abstract: Image 1 Highlights: Carbon addition resulted in three different enhancement/limitation patterns. The removal mechanisms are dependent on chemical structure of substrate. The removal of pharmaceuticals can be enhanced by carbon addition in biofilm reactors.