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Removal of clofibric acid and diclofenac during anaerobic digestion of sewage sludge

Zhou H., Zhang Q., Zhang Q, Ma L., Tu B., Li H., Zhou Y.

Environment Protection Engineering

2013

Vol. 39, nr 4

63--77

Removal of two acidic pharmaceuticals, clofibric acid and diclofenac, present in sewage sludge using two kinds of anaerobic digestions was investigated. The effective isolation and purification pretreatment to extract the target compounds from the sewage sludge samples was firstly established, followed by gas chromatography-mass spectrometry (GC-MS) analysis to identify and quantify them. Under mesophilic conditions, the removal efficiencies for clofibric acid and diclofenac with the initial concentrations of 5 μg /dm3 were up to 95% and 97%. After thermophilic anaerobic digestion, the removal efficiency could be increased to 99.3% for clofibric acid, however, it did not increase for diclofenac. In general, anaerobic digestion could effectively remove the target compounds from the sewage sludge (all above 90%).

Effect of natural organic matter on adsorption of ionic and non-ionic pharmaceuticals to granular activated carbon

Oh H., Urase T., Simazaki D., Kim H.

Environment Protection Engineering

2013

Vol. 39, nr 4

15--28

Adsorption of clofibric acid (CA) and propyphenazone (PPZ) to virgin granular activated carbon (GAC) and preloaded GAC was evaluated in the absence or presence of natural organic matter (NOM). In spite of lower log K ow, PPZ showed higher selectivity to GAC than CA, which has a carboxylic group. Adsorption competition between CA and PPZ in binary solutes system decreased the amount of individual compound adsorbed to GAC. Adsorption isotherm data obtained in the presence of NOM showed that NOM in bulk solution or preloaded on GAC could significantly reduce the amounts of CA and PPZ adsorbed to GAC.

Oczyszczanie ścieków farmaceutycznych metodą fotolizy UV

Biń A. K., Sobera-Madej S.

Inżynieria i Aparatura Chemiczna

2006

Nr 5s

21-25

Residual pharmaceuticals and their metabolites represent unde-sired contaminants in surface and ground waters. The advanced oxidations processes (AOPs) may offer an alternative way of their elimination from natural environment. Effects of direct UV (252 nm) photolysis and oxidation of pharmaceutical wastewa-ters {from antibiotic production) and aqueous solution of clofibric acid using UV/HzCh were studied.