Removal of 1,4-dioxane from landfill leachate by a rotating advanced oxidation contactor equipped with activated carbon/TiO2 composite sheets

Youhei Nomura; Shuji Fukahori; Taku Fujiwara

doi:10.1016/j.jhazmat.2019.121005

Removal of 1,4-dioxane from landfill leachate by a rotating advanced oxidation contactor equipped with activated carbon/TiO₂ composite sheets

J Hazard Mater. 2020 Feb 5:383:121005. doi: 10.1016/j.jhazmat.2019.121005. Epub 2019 Aug 13.

Authors

Youhei Nomura¹, Shuji Fukahori², Taku Fujiwara³

Affiliations

¹ Research and Education Faculty, Natural Sciences Cluster, Agriculture Unit, Kochi University, 200 Monobe Otsu, Nankoku, Kochi 783-8502, Japan; The United Graduate School of Agricultural Sciences, Ehime University, 3-5-7 Tarumi, Matsuyama, Ehime 790-8566, Japan.
² Paper Industry Innovation Center of Ehime University, 127 Mendori-cho, Shikokuchuo, Ehime 799-0113, Japan.
³ Research and Education Faculty, Natural Sciences Cluster, Agriculture Unit, Kochi University, 200 Monobe Otsu, Nankoku, Kochi 783-8502, Japan. Electronic address: fujiwarat@kochi-u.ac.jp.

PMID: 31671356
DOI: 10.1016/j.jhazmat.2019.121005

Abstract

A rotating advanced oxidation contactor (RAOC) equipped with activated carbon (AC)/TiO₂ composite sheets for 1,4-dioxane removal from biologically treated landfill leachate (BTLL) was developed. The performance of the RAOC in 1,4-dioxane removal was compared to that of a TiO₂ slurry reactor by evaluating the removal efficiencies in pure water (PW) and the BTLL. In the TiO₂ slurry reactor, 1,4-dioxane was hardly degraded in the BTLL during 66 h of treatment because of strong inhibition by coexisting substances in the BTLL. In contrast, the RAOC successfully removed 1,4-dioxane from the BTLL by 89% through adsorption and by 81% through photocatalysis during treatment for 66 h. The ratio of the rate constants for degrading 1,4-dioxane in the BTLL and PW by the RAOC was two orders of magnitude higher than that for a TiO₂ slurry reactor. This shows that the RAOC greatly mitigated the inhibition by coexisting substances in the BTLL. The electrical energy required for 1,4-dioxane degradation in the BTLL by the RAOC was much lower than that required for degradation by the TiO₂ slurry reactor. The results show that the RAOC equipped with AC/TiO₂ composite sheets effectively removed 1,4-dioxane from BTLL.

Keywords: 1,4-Dioxane; Activated carbon/TiO(2)composite sheet; Biologically treated landfill leachate; Mitigation; Rotating advanced oxidation contactor.

Publication types

Research Support, Non-U.S. Gov't