Removal of inert COD and trace metals from stabilized landfill leachate by granular activated carbon (GAC) adsorption

Journal of Environmental Management
Ehsan Mohammad-PajoohL R Sharifullina

Abstract

Landfills in Germany are currently approaching stabilization phase; as a result removal of inert organics and potentially toxic elements in the leachate is becoming a primary concern. Dissolved air floatation (DAF) at the secondary stage reduces only 27% of the residual chemical oxygen demand (COD) in the investigated treatment systems; downstream granular activated carbon (GAC) units are required to further reduce COD concentration by 40-56% to meet indirect discharge or direct discharge limits respectively. Therefore, in this study performance in terms of COD and trace metals adsorption of different types of granular activated carbon were compared over different contact times and dosages. GAC 1 with Brunauer-Emmett-Teller (BET) surface area of 719.5 ± 2.1 m2/g and average pore diameter (D) of 4.81 nm was identified to be inappropriate for treatment of leachate from this landfill. GAC 2 (with BET of 1513.7 ± 6.4 m2/g and D of 3.50 nm) was feasible for COD reduction from DAF-pretreated leachate, while GAC 3 (with BET of 644.5 ± 2.6 m2/g and D of 5.65 nm) can be coupled either with biological step alone, or as a tertiary step after the DAF unit. Moreover, as COD is the primary remaining contaminant of interest after secondary an...Continue Reading

Citations

Dec 13, 2019·Environmental Science and Pollution Research International·Ya GuYuyang Long
Mar 24, 2020·Environmental Technology·Renan Borelli GalvãoEmília Kiyomi Kuroda
Jul 8, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Liliana San-PedroGermán Giacomán-Vallejos
Apr 5, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Bo JiangJie Dai
Sep 28, 2021·Journal of the Air & Waste Management Association·Salvador VillamizarJoseph Soto

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