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Main Title: Fate of Trace Organic Compounds in Granular Activated Carbon (GAC) Adsorbers for Drinking Water Treatment
Author(s): Sperlich, Alexander
Harder, Mareike
Zietzschmann, Frederik
Gnirss, Regina
Type: Article
Language Code: en
Abstract: Granular activated carbon (GAC) adsorbers for drinking water treatment were operated for approx. 14 months and the breakthrough of dissolved organic carbon (DOC) and trace organic chemicals (TOrCs) was monitored. Effluent concentration profiles of gabapentin and valsartan acid increase already at throughputs of <10,000 BV. The corresponding breakthrough curves flatten out without reaching the influent concentration level. This strongly indicates biological degradation of these substances in the GAC adsorbers under aerobic conditions, contributing to a more efficient use of GAC. The observed biodegradation in pilot GAC adsorbers also confirms recent reports of biodegradation of gabapentin and valsartan acid during managed aquifer recharge. Oxypurinol is comparatively well adsorbed and no breakthrough was observed during the experimental period. Adsorption capacity and breakthrough characteristics of oxypurinol appear very similar to carbamazepine. Breakthrough of GAC adsorbers operated with drinking water was compared to those of groundwater-fed adsorbers. The results show, that it is generally advisable to use previously aerated influents for GAC fixed-bed adsorbers because this can substantially improve biological removal of otherwise poorly adsorbable compounds and ensure full GAC accessibility for adsorbates by avoiding the undesirable formation of inorganic precipitates on adsorption sites.
Issue Date: 30-Jun-2017
Date Available: 8-Aug-2019
DDC Class: 600 Technik, Technologie
551 Geologie, Hydrologie, Meteorologie
Subject(s): GAC adsorption
valsartan acid
drinking water
Sponsor/Funder: BMBF, 02WRS1368, TestTools – Entwicklung und Validierung von schnellen Testmethoden zum Spurenstoffverhalten in technischen und natürlichen Barrieren des urbanen Wasserkreislaufs
Journal Title: Water
Publisher: MDPI
Publisher Place: Basel
Volume: 9
Issue: 7
Article Number: 479
Publisher DOI: 10.3390/w9070479
EISSN: 2073-4441
Appears in Collections:FG Wasserreinhaltung » Publications

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