PAC dosing to an MBBR – Effects on adsorption of micropollutants, nitrification and microbial community
Journal article, 2019

Two nitrifying MBBR reactors were operated in parallel, one with PAC dosing and one without, to determine the effects of PAC dosing on nitrification and micropollutant adsorption in municipal wastewater. The removal of micropollutants was evaluated for several doses of PAC and batch experiments were performed to measure adsorption kinetics and nitrification rates. The influence of PAC on the nitrifying microbial community was examined by high-throughput amplicon sequencing. Long-term operation of the pilot reactors showed that nitrification could be maintained while supplying PAC at increasing doses, as confirmed by high nitrification rates and significant abundance of nitrifying bacteria. The adsorption of organic micropollutants could be controlled by the PAC dose, and increased dosing resulted in corresponding improvements in removal efficiency. Biomass, suspended or attached to carriers, did not interfere with the adsorption of organic micropollutants. Freundlich isotherms obtained from the batch experiments were used to predict removal of organic micropollutants in the pilot reactors, suggesting that batch adsorption experiments can be used to predict micropollutant removal on a full scale. Collectively, the results show that nitrification and adsorption of organic micropollutants can be performed simultaneously in an MBBR.

PAC

MBBR

Nitrification

Organic micropollutants

Pharmaceuticals

Author

M. Cimbritz

Lund University

Ellen Edefell

Sweden Water Research AB

Lund University

Elias Thörnqvist

Lund University

Haitam El-taliawy

Aarhus University

Maria Ekenberg

Veolia Water Technologies

Cecilia Burzio

Chalmers, Architecture and Civil Engineering, Water Environment Technology

Oskar Modin

Chalmers, Architecture and Civil Engineering, Water Environment Technology

Frank Persson

Chalmers, Architecture and Civil Engineering, Water Environment Technology

Britt-Marie Wilen

Chalmers, Architecture and Civil Engineering, Water Environment Technology

Kai Bester

Aarhus University

Per Falås

Lund University

Science of the Total Environment

0048-9697 (ISSN)

Vol. 677 571-579

Subject Categories

Water Engineering

Water Treatment

Environmental Sciences

DOI

10.1016/j.scitotenv.2019.04.261

More information

Latest update

5/14/2019