The benefits of powdered activated carbon recirculation for micropollutant removal in advanced wastewater treatment

Water Research
Felix MeinelM Jekel

Abstract

PAC adsorption is a widespread option for the removal of organic micropollutants (OMP) from secondary effluent. For an optimal exploitation of the adsorption capacity, PAC recirculation is nowadays a common practice, although the mechanistic interrelations of the complex recirculation process are not fully resolved. In this work, extensive multi-stage batch adsorption testing with repeated PAC and coagulant dosage was performed to evaluate the continuous-flow recirculation system. Partly loaded PAC showed a distinct amount of remaining capacity, as OMP and DOC removals considerably increased with each additional adsorption stage. At a low PAC dose of 10 mg PAC L(-1), removals of benzotriazole and carbamazepine were shown to rise from <40% in the first stage up to >80% in the 11th stage at 30 min adsorption time per stage. At a high PAC dose of 30 mg PAC L(-1), OMP and DOC removals were significantly higher and reached 98% (for benzotriazole and carbamazepine) after 11 stages. Coagulant dosage showed no influence on OMP removal, whereas a major part of DOC removal can be attributed to coagulation. Multi-stage adsorption is particularly beneficial for small PAC doses and significant PAC savings are feasible. A new model approach ...Continue Reading

References

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Oct 1, 2013·Chemosphere·Seung-Woo NamKyung-Duk Zoh

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Citations

Oct 8, 2016·The Science of the Total Environment·Danièle MouselJohannes Pinnekamp
Aug 18, 2016·Water Science and Technology : a Journal of the International Association on Water Pollution Research·F MeinelM Jekel
Feb 8, 2019·Current Pharmaceutical Biotechnology·Damiana RavasiAntonella Demarta
Jan 15, 2020·Environmental Technology·Hélène FallouPierre Le Cloirec
Nov 6, 2020·Journal of Environmental Management·Farooq SherEder C Lima
May 9, 2019·The Science of the Total Environment·Michael CimbritzPer Falås

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